NGW.js

(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
var ganetics = require('./genetics.js');
var sm = require('simple-statistics');
var csvWriter = require('csv-write-stream');
var fs = require('fs');

function NGW(options) {
	this.populationSize = options.populationSize || 10000;
	this.targetScore = options.targetScore;
	if (!options.targetScore) throw Error("Target Score needs to be set!");

	this.population = options.population;
	if (options.population.length <= 0) throw Error("population must be an array and contain at least 1 phenotypes");
	this.loger = options.loger;

	if (this.loger) {
		this.writer = csvWriter({
			separator: ',',
			newline: '\n',
			headers: undefined,
			sendHeaders: true
		});
	}

	this.mutate = options.mutate;

	this.fitness = options.fitness;

	this.sample = options.sample || false;
	this.limitGen = options.limitGen || false;



}

NGW.prototype.doIt = function() {
	if (this.loger) {
		this.writer.pipe(fs.createWriteStream('data.csv'));
	}
	var geneticAlgorithm = ganetics({
		mutationFunction: this.mutate,
		fitnessFunction: this.fitness,
		population: this.population,
		populationSize: this.populationSize
	});

	var previousBestScore = 0;
	var best;
	var genN = 0;
	do {

		geneticAlgorithm.evolve();
		best = geneticAlgorithm.best();

		console.log("Generation: " + genN + " Fitness: " + best.fitnessScore);
		var limitGen = this.limitGen || 200;

		previousBestScore = best.fitnessScore;
		if (this.loger) {
			var scores = geneticAlgorithm.scores();
			var median = sm.median(scores);
			var average = sm.mean(scores);
			var stddev = sm.standardDeviation(scores);
			var min = sm.min(scores);
			var max = sm.max(scores);
			console.log("Median score: " + median);
			console.log("Average score: " + average);
			console.log("stddev score: " + stddev);
			console.log("max score: " + max);
			console.log("min score: " + min);
			this.writer.write({
				generation: genN,
				max: max,
				median: median,
				average: average,
				stddev: stddev,
				min: min
			});
		}

		genN++;
		console.log("-----------------");
	} while (previousBestScore <= this.targetScore && genN < limitGen);
	if (this.sample) { this.sample(best) }
	console.log('END!');
	if (this.loger)
		this.writer.end();
	return best;

}

module.exports = NGW;
s = NGW;

},{"./genetics.js":2,"csv-write-stream":3,"fs":72,"simple-statistics":6}],2:[function(require,module,exports){
module.exports = function GeneticAlgorithm(options) {

	function settingDefaults() {
		return {
			mutationFunction: function(phenotype) {
				return phenotype
			},
			fitnessFunction: function(phenotype) {
				return 0
			},
			population: [],
			populationSize: 100,
		}
	}

	function settingWithDefaults(settings, defaults) {
		settings = settings || {}
		settings.mutationFunction = settings.mutationFunction || defaults.mutationFunction
		settings.fitnessFunction = settings.fitnessFunction || defaults.fitnessFunction

		settings.population = settings.population || defaults.population
		if (settings.population.length <= 0) throw Error("population must be an array and contain at least 1 phenotypes")

		settings.populationSize = settings.populationSize || defaults.populationSize
		if (settings.populationSize <= 0) throw Error("populationSize must be greater than 0")

		return settings
	}

	var settings = settingWithDefaults(options, settingDefaults())

	function populate() {
		var size = settings.population.length
		while (settings.population.length < settings.populationSize) {
			settings.population.push(
				mutate(settings.population[Math.floor(Math.random() * size)])
			);
		}
		randomizePopulationOrder();
	}

	function cloneJSON(object) {
		return JSON.parse(JSON.stringify(object))
	}

	function mutate(phenotype) {
		var mutated = settings.mutationFunction(cloneJSON(phenotype));
		mutated.fitnessScore = false;
		return mutated;
	}

	var theBest;

	function fitness(phenotype) {
		var score;
		if (phenotype.fitnessScore) {
			score = phenotype.fitnessScore;
		} else {
			score = settings.fitnessFunction(phenotype);
			phenotype.fitnessScore = score;
		}
		if (!(theBest && score < theBest.fitnessScore)) {
			theBest = phenotype;
		}
		return score;
	}

	function doesABeatB(a, b) {
		var doesABeatB = false;
		var scoreA = fitness(a);
		var scoreB = fitness(b);
		return scoreA >= scoreB;
	}

	function compete() {
		populate();
		var nextGeneration = []
		for (var p = 0; p < settings.population.length - 1; p += 2) {
			var phenotype = settings.population[p];
			var competitor = settings.population[p + 1];
			if (doesABeatB(phenotype, competitor)) {
				nextGeneration.push(phenotype)
			} else {
				nextGeneration.push(competitor)
			}
		}
		settings.population = nextGeneration;
	}



	function randomizePopulationOrder() {
		for (var index = 0; index < settings.population.length; index++) {
			var otherIndex = Math.floor(Math.random() * settings.population.length)
			var temp = settings.population[otherIndex]
			settings.population[otherIndex] = settings.population[index]
			settings.population[index] = temp
		}
	}

	return {
		evolve: function(options) {
			if (options) {
				settings = settingWithDefaults(options, settings);
			}
			compete();
			return this;
		},
		best: function() {
			return cloneJSON(theBest)
		},
		bestScore: function() {
			return fitness(this.best())
		},
		population: function() {
			return cloneJSON(this.config().population)
		},
		scoredPopulation: function() {
			return this.population().map(function(phenotype) {
				return {
					phenotype: cloneJSON(phenotype),
					score: fitness(phenotype)
				}
			})
		},
		scores: function() {
			return this.population().map(function(phenotype) {
				return fitness(phenotype);
			})
		},
		config: function() {
			return cloneJSON(settings)
		},
		clone: function(options) {
			return GeneticAlgorithm(
				settingWithDefaults(options,
					settingWithDefaults(this.config(), settings)
				)
			)
		}
	}
}

},{}],3:[function(require,module,exports){
(function (process){
var stream = require('stream')
var util = require('util')
var gen = require('generate-object-property')

var CsvWriteStream = function(opts) {
  if (!opts) opts = {}
  stream.Transform.call(this, {objectMode:true, highWaterMark:16})

  this.sendHeaders = opts.sendHeaders !== false
  this.headers = opts.headers || null
  this.separator = opts.separator || opts.seperator || ','
  this.newline = opts.newline || '\n'

  this._objRow = null
  this._arrRow = null
  this._first = true
  this._destroyed = false
}

util.inherits(CsvWriteStream, stream.Transform)

CsvWriteStream.prototype._compile = function(headers) {
  var newline = this.newline
  var sep = this.separator
  var str = 'function toRow(obj) {\n'

  if (!headers.length) str += '""'

  headers = headers.map(function(prop, i) {
    str += 'var a'+i+' = '+prop+' == null ? "" : '+prop+'\n'
    return 'a'+i
  })

  for (var i = 0; i < headers.length; i += 500) { // do not overflowi the callstack on lots of cols
    var part = headers.length < 500 ? headers : headers.slice(i, i + 500)
    str += i ? 'result += "'+sep+'" + ' : 'var result = '
    part.forEach(function(prop, j) {
      str += (j ? '+"'+sep+'"+' : '') + '(/['+sep+'\\r\\n"]/.test('+prop+') ? esc('+prop+'+"") : '+prop+')'
    })
    str += '\n'
  }

  str += 'return result +'+JSON.stringify(newline)+'\n}'

  return new Function('esc', 'return '+str)(esc)
}

CsvWriteStream.prototype._transform = function(row, enc, cb) {
  var isArray = Array.isArray(row)

  if (!isArray && !this.headers) this.headers = Object.keys(row)

  if (this._first && this.headers) {
    this._first = false

    var objProps = []
    var arrProps = []
    var heads = []

    for (var i = 0; i < this.headers.length; i++) {
      arrProps.push('obj['+i+']')
      objProps.push(gen('obj', this.headers[i]))
    }

    this._objRow = this._compile(objProps)
    this._arrRow = this._compile(arrProps)

    if (this.sendHeaders) this.push(this._arrRow(this.headers))
  }

  if (isArray) {
    if (!this.headers) return cb(new Error('no headers specified'))
    this.push(this._arrRow(row))
  } else {
    this.push(this._objRow(row))
  }

  cb()
}

CsvWriteStream.prototype.destroy = function (err) {
  if (this._destroyed) return
  this._destroyed = true

  var self = this

  process.nextTick(function () {
    if (err) self.emit('error', err)
    self.emit('close')
  })
}

module.exports = function(opts) {
  return new CsvWriteStream(opts)
}

function esc(cell) {
  return '"'+cell.replace(/"/g, '""')+'"'
}

}).call(this,require('_process'))
},{"_process":83,"generate-object-property":4,"stream":98,"util":103}],4:[function(require,module,exports){
var isProperty = require('is-property')

var gen = function(obj, prop) {
  return isProperty(prop) ? obj+'.'+prop : obj+'['+JSON.stringify(prop)+']'
}

gen.valid = isProperty
gen.property = function (prop) {
 return isProperty(prop) ? prop : JSON.stringify(prop)
}

module.exports = gen

},{"is-property":5}],5:[function(require,module,exports){
"use strict"
function isProperty(str) {
  return /^[$A-Z\_a-z\xaa\xb5\xba\xc0-\xd6\xd8-\xf6\xf8-\u02c1\u02c6-\u02d1\u02e0-\u02e4\u02ec\u02ee\u0370-\u0374\u0376\u0377\u037a-\u037d\u0386\u0388-\u038a\u038c\u038e-\u03a1\u03a3-\u03f5\u03f7-\u0481\u048a-\u0527\u0531-\u0556\u0559\u0561-\u0587\u05d0-\u05ea\u05f0-\u05f2\u0620-\u064a\u066e\u066f\u0671-\u06d3\u06d5\u06e5\u06e6\u06ee\u06ef\u06fa-\u06fc\u06ff\u0710\u0712-\u072f\u074d-\u07a5\u07b1\u07ca-\u07ea\u07f4\u07f5\u07fa\u0800-\u0815\u081a\u0824\u0828\u0840-\u0858\u08a0\u08a2-\u08ac\u0904-\u0939\u093d\u0950\u0958-\u0961\u0971-\u0977\u0979-\u097f\u0985-\u098c\u098f\u0990\u0993-\u09a8\u09aa-\u09b0\u09b2\u09b6-\u09b9\u09bd\u09ce\u09dc\u09dd\u09df-\u09e1\u09f0\u09f1\u0a05-\u0a0a\u0a0f\u0a10\u0a13-\u0a28\u0a2a-\u0a30\u0a32\u0a33\u0a35\u0a36\u0a38\u0a39\u0a59-\u0a5c\u0a5e\u0a72-\u0a74\u0a85-\u0a8d\u0a8f-\u0a91\u0a93-\u0aa8\u0aaa-\u0ab0\u0ab2\u0ab3\u0ab5-\u0ab9\u0abd\u0ad0\u0ae0\u0ae1\u0b05-\u0b0c\u0b0f\u0b10\u0b13-\u0b28\u0b2a-\u0b30\u0b32\u0b33\u0b35-\u0b39\u0b3d\u0b5c\u0b5d\u0b5f-\u0b61\u0b71\u0b83\u0b85-\u0b8a\u0b8e-\u0b90\u0b92-\u0b95\u0b99\u0b9a\u0b9c\u0b9e\u0b9f\u0ba3\u0ba4\u0ba8-\u0baa\u0bae-\u0bb9\u0bd0\u0c05-\u0c0c\u0c0e-\u0c10\u0c12-\u0c28\u0c2a-\u0c33\u0c35-\u0c39\u0c3d\u0c58\u0c59\u0c60\u0c61\u0c85-\u0c8c\u0c8e-\u0c90\u0c92-\u0ca8\u0caa-\u0cb3\u0cb5-\u0cb9\u0cbd\u0cde\u0ce0\u0ce1\u0cf1\u0cf2\u0d05-\u0d0c\u0d0e-\u0d10\u0d12-\u0d3a\u0d3d\u0d4e\u0d60\u0d61\u0d7a-\u0d7f\u0d85-\u0d96\u0d9a-\u0db1\u0db3-\u0dbb\u0dbd\u0dc0-\u0dc6\u0e01-\u0e30\u0e32\u0e33\u0e40-\u0e46\u0e81\u0e82\u0e84\u0e87\u0e88\u0e8a\u0e8d\u0e94-\u0e97\u0e99-\u0e9f\u0ea1-\u0ea3\u0ea5\u0ea7\u0eaa\u0eab\u0ead-\u0eb0\u0eb2\u0eb3\u0ebd\u0ec0-\u0ec4\u0ec6\u0edc-\u0edf\u0f00\u0f40-\u0f47\u0f49-\u0f6c\u0f88-\u0f8c\u1000-\u102a\u103f\u1050-\u1055\u105a-\u105d\u1061\u1065\u1066\u106e-\u1070\u1075-\u1081\u108e\u10a0-\u10c5\u10c7\u10cd\u10d0-\u10fa\u10fc-\u1248\u124a-\u124d\u1250-\u1256\u1258\u125a-\u125d\u1260-\u1288\u128a-\u128d\u1290-\u12b0\u12b2-\u12b5\u12b8-\u12be\u12c0\u12c2-\u12c5\u12c8-\u12d6\u12d8-\u1310\u1312-\u1315\u1318-\u135a\u1380-\u138f\u13a0-\u13f4\u1401-\u166c\u166f-\u167f\u1681-\u169a\u16a0-\u16ea\u16ee-\u16f0\u1700-\u170c\u170e-\u1711\u1720-\u1731\u1740-\u1751\u1760-\u176c\u176e-\u1770\u1780-\u17b3\u17d7\u17dc\u1820-\u1877\u1880-\u18a8\u18aa\u18b0-\u18f5\u1900-\u191c\u1950-\u196d\u1970-\u1974\u1980-\u19ab\u19c1-\u19c7\u1a00-\u1a16\u1a20-\u1a54\u1aa7\u1b05-\u1b33\u1b45-\u1b4b\u1b83-\u1ba0\u1bae\u1baf\u1bba-\u1be5\u1c00-\u1c23\u1c4d-\u1c4f\u1c5a-\u1c7d\u1ce9-\u1cec\u1cee-\u1cf1\u1cf5\u1cf6\u1d00-\u1dbf\u1e00-\u1f15\u1f18-\u1f1d\u1f20-\u1f45\u1f48-\u1f4d\u1f50-\u1f57\u1f59\u1f5b\u1f5d\u1f5f-\u1f7d\u1f80-\u1fb4\u1fb6-\u1fbc\u1fbe\u1fc2-\u1fc4\u1fc6-\u1fcc\u1fd0-\u1fd3\u1fd6-\u1fdb\u1fe0-\u1fec\u1ff2-\u1ff4\u1ff6-\u1ffc\u2071\u207f\u2090-\u209c\u2102\u2107\u210a-\u2113\u2115\u2119-\u211d\u2124\u2126\u2128\u212a-\u212d\u212f-\u2139\u213c-\u213f\u2145-\u2149\u214e\u2160-\u2188\u2c00-\u2c2e\u2c30-\u2c5e\u2c60-\u2ce4\u2ceb-\u2cee\u2cf2\u2cf3\u2d00-\u2d25\u2d27\u2d2d\u2d30-\u2d67\u2d6f\u2d80-\u2d96\u2da0-\u2da6\u2da8-\u2dae\u2db0-\u2db6\u2db8-\u2dbe\u2dc0-\u2dc6\u2dc8-\u2dce\u2dd0-\u2dd6\u2dd8-\u2dde\u2e2f\u3005-\u3007\u3021-\u3029\u3031-\u3035\u3038-\u303c\u3041-\u3096\u309d-\u309f\u30a1-\u30fa\u30fc-\u30ff\u3105-\u312d\u3131-\u318e\u31a0-\u31ba\u31f0-\u31ff\u3400-\u4db5\u4e00-\u9fcc\ua000-\ua48c\ua4d0-\ua4fd\ua500-\ua60c\ua610-\ua61f\ua62a\ua62b\ua640-\ua66e\ua67f-\ua697\ua6a0-\ua6ef\ua717-\ua71f\ua722-\ua788\ua78b-\ua78e\ua790-\ua793\ua7a0-\ua7aa\ua7f8-\ua801\ua803-\ua805\ua807-\ua80a\ua80c-\ua822\ua840-\ua873\ua882-\ua8b3\ua8f2-\ua8f7\ua8fb\ua90a-\ua925\ua930-\ua946\ua960-\ua97c\ua984-\ua9b2\ua9cf\uaa00-\uaa28\uaa40-\uaa42\uaa44-\uaa4b\uaa60-\uaa76\uaa7a\uaa80-\uaaaf\uaab1\uaab5\uaab6\uaab9-\uaabd\uaac0\uaac2\uaadb-\uaadd\uaae0-\uaaea\uaaf2-\uaaf4\uab01-\uab06\uab09-\uab0e\uab11-\uab16\uab20-\uab26\uab28-\uab2e\uabc0-\uabe2\uac00-\ud7a3\ud7b0-\ud7c6\ud7cb-\ud7fb\uf900-\ufa6d\ufa70-\ufad9\ufb00-\ufb06\ufb13-\ufb17\ufb1d\ufb1f-\ufb28\ufb2a-\ufb36\ufb38-\ufb3c\ufb3e\ufb40\ufb41\ufb43\ufb44\ufb46-\ufbb1\ufbd3-\ufd3d\ufd50-\ufd8f\ufd92-\ufdc7\ufdf0-\ufdfb\ufe70-\ufe74\ufe76-\ufefc\uff21-\uff3a\uff41-\uff5a\uff66-\uffbe\uffc2-\uffc7\uffca-\uffcf\uffd2-\uffd7\uffda-\uffdc][$A-Z\_a-z\xaa\xb5\xba\xc0-\xd6\xd8-\xf6\xf8-\u02c1\u02c6-\u02d1\u02e0-\u02e4\u02ec\u02ee\u0370-\u0374\u0376\u0377\u037a-\u037d\u0386\u0388-\u038a\u038c\u038e-\u03a1\u03a3-\u03f5\u03f7-\u0481\u048a-\u0527\u0531-\u0556\u0559\u0561-\u0587\u05d0-\u05ea\u05f0-\u05f2\u0620-\u064a\u066e\u066f\u0671-\u06d3\u06d5\u06e5\u06e6\u06ee\u06ef\u06fa-\u06fc\u06ff\u0710\u0712-\u072f\u074d-\u07a5\u07b1\u07ca-\u07ea\u07f4\u07f5\u07fa\u0800-\u0815\u081a\u0824\u0828\u0840-\u0858\u08a0\u08a2-\u08ac\u0904-\u0939\u093d\u0950\u0958-\u0961\u0971-\u0977\u0979-\u097f\u0985-\u098c\u098f\u0990\u0993-\u09a8\u09aa-\u09b0\u09b2\u09b6-\u09b9\u09bd\u09ce\u09dc\u09dd\u09df-\u09e1\u09f0\u09f1\u0a05-\u0a0a\u0a0f\u0a10\u0a13-\u0a28\u0a2a-\u0a30\u0a32\u0a33\u0a35\u0a36\u0a38\u0a39\u0a59-\u0a5c\u0a5e\u0a72-\u0a74\u0a85-\u0a8d\u0a8f-\u0a91\u0a93-\u0aa8\u0aaa-\u0ab0\u0ab2\u0ab3\u0ab5-\u0ab9\u0abd\u0ad0\u0ae0\u0ae1\u0b05-\u0b0c\u0b0f\u0b10\u0b13-\u0b28\u0b2a-\u0b30\u0b32\u0b33\u0b35-\u0b39\u0b3d\u0b5c\u0b5d\u0b5f-\u0b61\u0b71\u0b83\u0b85-\u0b8a\u0b8e-\u0b90\u0b92-\u0b95\u0b99\u0b9a\u0b9c\u0b9e\u0b9f\u0ba3\u0ba4\u0ba8-\u0baa\u0bae-\u0bb9\u0bd0\u0c05-\u0c0c\u0c0e-\u0c10\u0c12-\u0c28\u0c2a-\u0c33\u0c35-\u0c39\u0c3d\u0c58\u0c59\u0c60\u0c61\u0c85-\u0c8c\u0c8e-\u0c90\u0c92-\u0ca8\u0caa-\u0cb3\u0cb5-\u0cb9\u0cbd\u0cde\u0ce0\u0ce1\u0cf1\u0cf2\u0d05-\u0d0c\u0d0e-\u0d10\u0d12-\u0d3a\u0d3d\u0d4e\u0d60\u0d61\u0d7a-\u0d7f\u0d85-\u0d96\u0d9a-\u0db1\u0db3-\u0dbb\u0dbd\u0dc0-\u0dc6\u0e01-\u0e30\u0e32\u0e33\u0e40-\u0e46\u0e81\u0e82\u0e84\u0e87\u0e88\u0e8a\u0e8d\u0e94-\u0e97\u0e99-\u0e9f\u0ea1-\u0ea3\u0ea5\u0ea7\u0eaa\u0eab\u0ead-\u0eb0\u0eb2\u0eb3\u0ebd\u0ec0-\u0ec4\u0ec6\u0edc-\u0edf\u0f00\u0f40-\u0f47\u0f49-\u0f6c\u0f88-\u0f8c\u1000-\u102a\u103f\u1050-\u1055\u105a-\u105d\u1061\u1065\u1066\u106e-\u1070\u1075-\u1081\u108e\u10a0-\u10c5\u10c7\u10cd\u10d0-\u10fa\u10fc-\u1248\u124a-\u124d\u1250-\u1256\u1258\u125a-\u125d\u1260-\u1288\u128a-\u128d\u1290-\u12b0\u12b2-\u12b5\u12b8-\u12be\u12c0\u12c2-\u12c5\u12c8-\u12d6\u12d8-\u1310\u1312-\u1315\u1318-\u135a\u1380-\u138f\u13a0-\u13f4\u1401-\u166c\u166f-\u167f\u1681-\u169a\u16a0-\u16ea\u16ee-\u16f0\u1700-\u170c\u170e-\u1711\u1720-\u1731\u1740-\u1751\u1760-\u176c\u176e-\u1770\u1780-\u17b3\u17d7\u17dc\u1820-\u1877\u1880-\u18a8\u18aa\u18b0-\u18f5\u1900-\u191c\u1950-\u196d\u1970-\u1974\u1980-\u19ab\u19c1-\u19c7\u1a00-\u1a16\u1a20-\u1a54\u1aa7\u1b05-\u1b33\u1b45-\u1b4b\u1b83-\u1ba0\u1bae\u1baf\u1bba-\u1be5\u1c00-\u1c23\u1c4d-\u1c4f\u1c5a-\u1c7d\u1ce9-\u1cec\u1cee-\u1cf1\u1cf5\u1cf6\u1d00-\u1dbf\u1e00-\u1f15\u1f18-\u1f1d\u1f20-\u1f45\u1f48-\u1f4d\u1f50-\u1f57\u1f59\u1f5b\u1f5d\u1f5f-\u1f7d\u1f80-\u1fb4\u1fb6-\u1fbc\u1fbe\u1fc2-\u1fc4\u1fc6-\u1fcc\u1fd0-\u1fd3\u1fd6-\u1fdb\u1fe0-\u1fec\u1ff2-\u1ff4\u1ff6-\u1ffc\u2071\u207f\u2090-\u209c\u2102\u2107\u210a-\u2113\u2115\u2119-\u211d\u2124\u2126\u2128\u212a-\u212d\u212f-\u2139\u213c-\u213f\u2145-\u2149\u214e\u2160-\u2188\u2c00-\u2c2e\u2c30-\u2c5e\u2c60-\u2ce4\u2ceb-\u2cee\u2cf2\u2cf3\u2d00-\u2d25\u2d27\u2d2d\u2d30-\u2d67\u2d6f\u2d80-\u2d96\u2da0-\u2da6\u2da8-\u2dae\u2db0-\u2db6\u2db8-\u2dbe\u2dc0-\u2dc6\u2dc8-\u2dce\u2dd0-\u2dd6\u2dd8-\u2dde\u2e2f\u3005-\u3007\u3021-\u3029\u3031-\u3035\u3038-\u303c\u3041-\u3096\u309d-\u309f\u30a1-\u30fa\u30fc-\u30ff\u3105-\u312d\u3131-\u318e\u31a0-\u31ba\u31f0-\u31ff\u3400-\u4db5\u4e00-\u9fcc\ua000-\ua48c\ua4d0-\ua4fd\ua500-\ua60c\ua610-\ua61f\ua62a\ua62b\ua640-\ua66e\ua67f-\ua697\ua6a0-\ua6ef\ua717-\ua71f\ua722-\ua788\ua78b-\ua78e\ua790-\ua793\ua7a0-\ua7aa\ua7f8-\ua801\ua803-\ua805\ua807-\ua80a\ua80c-\ua822\ua840-\ua873\ua882-\ua8b3\ua8f2-\ua8f7\ua8fb\ua90a-\ua925\ua930-\ua946\ua960-\ua97c\ua984-\ua9b2\ua9cf\uaa00-\uaa28\uaa40-\uaa42\uaa44-\uaa4b\uaa60-\uaa76\uaa7a\uaa80-\uaaaf\uaab1\uaab5\uaab6\uaab9-\uaabd\uaac0\uaac2\uaadb-\uaadd\uaae0-\uaaea\uaaf2-\uaaf4\uab01-\uab06\uab09-\uab0e\uab11-\uab16\uab20-\uab26\uab28-\uab2e\uabc0-\uabe2\uac00-\ud7a3\ud7b0-\ud7c6\ud7cb-\ud7fb\uf900-\ufa6d\ufa70-\ufad9\ufb00-\ufb06\ufb13-\ufb17\ufb1d\ufb1f-\ufb28\ufb2a-\ufb36\ufb38-\ufb3c\ufb3e\ufb40\ufb41\ufb43\ufb44\ufb46-\ufbb1\ufbd3-\ufd3d\ufd50-\ufd8f\ufd92-\ufdc7\ufdf0-\ufdfb\ufe70-\ufe74\ufe76-\ufefc\uff21-\uff3a\uff41-\uff5a\uff66-\uffbe\uffc2-\uffc7\uffca-\uffcf\uffd2-\uffd7\uffda-\uffdc0-9\u0300-\u036f\u0483-\u0487\u0591-\u05bd\u05bf\u05c1\u05c2\u05c4\u05c5\u05c7\u0610-\u061a\u064b-\u0669\u0670\u06d6-\u06dc\u06df-\u06e4\u06e7\u06e8\u06ea-\u06ed\u06f0-\u06f9\u0711\u0730-\u074a\u07a6-\u07b0\u07c0-\u07c9\u07eb-\u07f3\u0816-\u0819\u081b-\u0823\u0825-\u0827\u0829-\u082d\u0859-\u085b\u08e4-\u08fe\u0900-\u0903\u093a-\u093c\u093e-\u094f\u0951-\u0957\u0962\u0963\u0966-\u096f\u0981-\u0983\u09bc\u09be-\u09c4\u09c7\u09c8\u09cb-\u09cd\u09d7\u09e2\u09e3\u09e6-\u09ef\u0a01-\u0a03\u0a3c\u0a3e-\u0a42\u0a47\u0a48\u0a4b-\u0a4d\u0a51\u0a66-\u0a71\u0a75\u0a81-\u0a83\u0abc\u0abe-\u0ac5\u0ac7-\u0ac9\u0acb-\u0acd\u0ae2\u0ae3\u0ae6-\u0aef\u0b01-\u0b03\u0b3c\u0b3e-\u0b44\u0b47\u0b48\u0b4b-\u0b4d\u0b56\u0b57\u0b62\u0b63\u0b66-\u0b6f\u0b82\u0bbe-\u0bc2\u0bc6-\u0bc8\u0bca-\u0bcd\u0bd7\u0be6-\u0bef\u0c01-\u0c03\u0c3e-\u0c44\u0c46-\u0c48\u0c4a-\u0c4d\u0c55\u0c56\u0c62\u0c63\u0c66-\u0c6f\u0c82\u0c83\u0cbc\u0cbe-\u0cc4\u0cc6-\u0cc8\u0cca-\u0ccd\u0cd5\u0cd6\u0ce2\u0ce3\u0ce6-\u0cef\u0d02\u0d03\u0d3e-\u0d44\u0d46-\u0d48\u0d4a-\u0d4d\u0d57\u0d62\u0d63\u0d66-\u0d6f\u0d82\u0d83\u0dca\u0dcf-\u0dd4\u0dd6\u0dd8-\u0ddf\u0df2\u0df3\u0e31\u0e34-\u0e3a\u0e47-\u0e4e\u0e50-\u0e59\u0eb1\u0eb4-\u0eb9\u0ebb\u0ebc\u0ec8-\u0ecd\u0ed0-\u0ed9\u0f18\u0f19\u0f20-\u0f29\u0f35\u0f37\u0f39\u0f3e\u0f3f\u0f71-\u0f84\u0f86\u0f87\u0f8d-\u0f97\u0f99-\u0fbc\u0fc6\u102b-\u103e\u1040-\u1049\u1056-\u1059\u105e-\u1060\u1062-\u1064\u1067-\u106d\u1071-\u1074\u1082-\u108d\u108f-\u109d\u135d-\u135f\u1712-\u1714\u1732-\u1734\u1752\u1753\u1772\u1773\u17b4-\u17d3\u17dd\u17e0-\u17e9\u180b-\u180d\u1810-\u1819\u18a9\u1920-\u192b\u1930-\u193b\u1946-\u194f\u19b0-\u19c0\u19c8\u19c9\u19d0-\u19d9\u1a17-\u1a1b\u1a55-\u1a5e\u1a60-\u1a7c\u1a7f-\u1a89\u1a90-\u1a99\u1b00-\u1b04\u1b34-\u1b44\u1b50-\u1b59\u1b6b-\u1b73\u1b80-\u1b82\u1ba1-\u1bad\u1bb0-\u1bb9\u1be6-\u1bf3\u1c24-\u1c37\u1c40-\u1c49\u1c50-\u1c59\u1cd0-\u1cd2\u1cd4-\u1ce8\u1ced\u1cf2-\u1cf4\u1dc0-\u1de6\u1dfc-\u1dff\u200c\u200d\u203f\u2040\u2054\u20d0-\u20dc\u20e1\u20e5-\u20f0\u2cef-\u2cf1\u2d7f\u2de0-\u2dff\u302a-\u302f\u3099\u309a\ua620-\ua629\ua66f\ua674-\ua67d\ua69f\ua6f0\ua6f1\ua802\ua806\ua80b\ua823-\ua827\ua880\ua881\ua8b4-\ua8c4\ua8d0-\ua8d9\ua8e0-\ua8f1\ua900-\ua909\ua926-\ua92d\ua947-\ua953\ua980-\ua983\ua9b3-\ua9c0\ua9d0-\ua9d9\uaa29-\uaa36\uaa43\uaa4c\uaa4d\uaa50-\uaa59\uaa7b\uaab0\uaab2-\uaab4\uaab7\uaab8\uaabe\uaabf\uaac1\uaaeb-\uaaef\uaaf5\uaaf6\uabe3-\uabea\uabec\uabed\uabf0-\uabf9\ufb1e\ufe00-\ufe0f\ufe20-\ufe26\ufe33\ufe34\ufe4d-\ufe4f\uff10-\uff19\uff3f]*$/.test(str)
}
module.exports = isProperty
},{}],6:[function(require,module,exports){
/* @flow */
'use strict';

// # simple-statistics
//
// A simple, literate statistics system.

var ss = module.exports = {};

// Linear Regression
ss.linearRegression = require('./src/linear_regression');
ss.linearRegressionLine = require('./src/linear_regression_line');
ss.standardDeviation = require('./src/standard_deviation');
ss.rSquared = require('./src/r_squared');
ss.mode = require('./src/mode');
ss.modeFast = require('./src/mode_fast');
ss.modeSorted = require('./src/mode_sorted');
ss.min = require('./src/min');
ss.max = require('./src/max');
ss.minSorted = require('./src/min_sorted');
ss.maxSorted = require('./src/max_sorted');
ss.sum = require('./src/sum');
ss.sumSimple = require('./src/sum_simple');
ss.product = require('./src/product');
ss.quantile = require('./src/quantile');
ss.quantileSorted = require('./src/quantile_sorted');
ss.iqr = ss.interquartileRange = require('./src/interquartile_range');
ss.medianAbsoluteDeviation = ss.mad = require('./src/median_absolute_deviation');
ss.chunk = require('./src/chunk');
ss.sampleWithReplacement = require('./src/sample_with_replacement');
ss.shuffle = require('./src/shuffle');
ss.shuffleInPlace = require('./src/shuffle_in_place');
ss.sample = require('./src/sample');
ss.ckmeans = require('./src/ckmeans');
ss.uniqueCountSorted = require('./src/unique_count_sorted');
ss.sumNthPowerDeviations = require('./src/sum_nth_power_deviations');
ss.equalIntervalBreaks = require('./src/equal_interval_breaks');

// sample statistics
ss.sampleCovariance = require('./src/sample_covariance');
ss.sampleCorrelation = require('./src/sample_correlation');
ss.sampleVariance = require('./src/sample_variance');
ss.sampleStandardDeviation = require('./src/sample_standard_deviation');
ss.sampleSkewness = require('./src/sample_skewness');

// combinatorics
ss.permutationsHeap = require('./src/permutations_heap');
ss.combinations = require('./src/combinations');
ss.combinationsReplacement = require('./src/combinations_replacement');

// measures of centrality
ss.addToMean = require('./src/add_to_mean');
ss.geometricMean = require('./src/geometric_mean');
ss.harmonicMean = require('./src/harmonic_mean');
ss.mean = ss.average = require('./src/mean');
ss.median = require('./src/median');
ss.medianSorted = require('./src/median_sorted');

ss.rootMeanSquare = ss.rms = require('./src/root_mean_square');
ss.variance = require('./src/variance');
ss.tTest = require('./src/t_test');
ss.tTestTwoSample = require('./src/t_test_two_sample');
// ss.jenks = require('./src/jenks');

// Classifiers
ss.bayesian = require('./src/bayesian_classifier');
ss.perceptron = require('./src/perceptron');

// Distribution-related methods
ss.epsilon = require('./src/epsilon'); // We make ε available to the test suite.
ss.factorial = require('./src/factorial');
ss.bernoulliDistribution = require('./src/bernoulli_distribution');
ss.binomialDistribution = require('./src/binomial_distribution');
ss.poissonDistribution = require('./src/poisson_distribution');
ss.chiSquaredGoodnessOfFit = require('./src/chi_squared_goodness_of_fit');

// Normal distribution
ss.zScore = require('./src/z_score');
ss.cumulativeStdNormalProbability = require('./src/cumulative_std_normal_probability');
ss.standardNormalTable = require('./src/standard_normal_table');
ss.errorFunction = ss.erf = require('./src/error_function');
ss.inverseErrorFunction = require('./src/inverse_error_function');
ss.probit = require('./src/probit');
ss.mixin = require('./src/mixin');

// Root-finding methods
ss.bisect = require('./src/bisect');

},{"./src/add_to_mean":7,"./src/bayesian_classifier":8,"./src/bernoulli_distribution":9,"./src/binomial_distribution":10,"./src/bisect":11,"./src/chi_squared_goodness_of_fit":13,"./src/chunk":14,"./src/ckmeans":15,"./src/combinations":16,"./src/combinations_replacement":17,"./src/cumulative_std_normal_probability":18,"./src/epsilon":19,"./src/equal_interval_breaks":20,"./src/error_function":21,"./src/factorial":22,"./src/geometric_mean":23,"./src/harmonic_mean":24,"./src/interquartile_range":25,"./src/inverse_error_function":26,"./src/linear_regression":27,"./src/linear_regression_line":28,"./src/max":29,"./src/max_sorted":30,"./src/mean":31,"./src/median":32,"./src/median_absolute_deviation":33,"./src/median_sorted":34,"./src/min":35,"./src/min_sorted":36,"./src/mixin":37,"./src/mode":38,"./src/mode_fast":39,"./src/mode_sorted":40,"./src/perceptron":42,"./src/permutations_heap":43,"./src/poisson_distribution":44,"./src/probit":45,"./src/product":46,"./src/quantile":47,"./src/quantile_sorted":48,"./src/r_squared":50,"./src/root_mean_square":51,"./src/sample":52,"./src/sample_correlation":53,"./src/sample_covariance":54,"./src/sample_skewness":55,"./src/sample_standard_deviation":56,"./src/sample_variance":57,"./src/sample_with_replacement":58,"./src/shuffle":59,"./src/shuffle_in_place":60,"./src/standard_deviation":62,"./src/standard_normal_table":63,"./src/sum":64,"./src/sum_nth_power_deviations":65,"./src/sum_simple":66,"./src/t_test":67,"./src/t_test_two_sample":68,"./src/unique_count_sorted":69,"./src/variance":70,"./src/z_score":71}],7:[function(require,module,exports){
'use strict';
/* @flow */

/**
 * When adding a new value to a list, one does not have to necessary
 * recompute the mean of the list in linear time. They can instead use
 * this function to compute the new mean by providing the current mean,
 * the number of elements in the list that produced it and the new
 * value to add.
 *
 * @param {number} mean current mean
 * @param {number} n number of items in the list
 * @param {number} newValue the added value
 * @returns {number} the new mean
 *
 * @example
 * addToMean(14, 5, 53); // => 20.5
 */
function addToMean(mean /*: number*/, n/*: number */, newValue/*: number */)/*: number */ {
    return mean + ((newValue - mean) / (n + 1));
}

module.exports = addToMean;

},{}],8:[function(require,module,exports){
'use strict';
/* @flow */

/**
 * [Bayesian Classifier](http://en.wikipedia.org/wiki/Naive_Bayes_classifier)
 *
 * This is a naïve bayesian classifier that takes
 * singly-nested objects.
 *
 * @class
 * @example
 * var bayes = new BayesianClassifier();
 * bayes.train({
 *   species: 'Cat'
 * }, 'animal');
 * var result = bayes.score({
 *   species: 'Cat'
 * })
 * // result
 * // {
 * //   animal: 1
 * // }
 */
function BayesianClassifier() {
    // The number of items that are currently
    // classified in the model
    this.totalCount = 0;
    // Every item classified in the model
    this.data = {};
}

/**
 * Train the classifier with a new item, which has a single
 * dimension of Javascript literal keys and values.
 *
 * @param {Object} item an object with singly-deep properties
 * @param {string} category the category this item belongs to
 * @return {undefined} adds the item to the classifier
 */
BayesianClassifier.prototype.train = function(item, category) {
    // If the data object doesn't have any values
    // for this category, create a new object for it.
    if (!this.data[category]) {
        this.data[category] = {};
    }

    // Iterate through each key in the item.
    for (var k in item) {
        var v = item[k];
        // Initialize the nested object `data[category][k][item[k]]`
        // with an object of keys that equal 0.
        if (this.data[category][k] === undefined) {
            this.data[category][k] = {};
        }
        if (this.data[category][k][v] === undefined) {
            this.data[category][k][v] = 0;
        }

        // And increment the key for this key/value combination.
        this.data[category][k][v]++;
    }

    // Increment the number of items classified
    this.totalCount++;
};

/**
 * Generate a score of how well this item matches all
 * possible categories based on its attributes
 *
 * @param {Object} item an item in the same format as with train
 * @returns {Object} of probabilities that this item belongs to a
 * given category.
 */
BayesianClassifier.prototype.score = function(item) {
    // Initialize an empty array of odds per category.
    var odds = {}, category;
    // Iterate through each key in the item,
    // then iterate through each category that has been used
    // in previous calls to `.train()`
    for (var k in item) {
        var v = item[k];
        for (category in this.data) {
            // Create an empty object for storing key - value combinations
            // for this category.
            odds[category] = {};

            // If this item doesn't even have a property, it counts for nothing,
            // but if it does have the property that we're looking for from
            // the item to categorize, it counts based on how popular it is
            // versus the whole population.
            if (this.data[category][k]) {
                odds[category][k + '_' + v] = (this.data[category][k][v] || 0) / this.totalCount;
            } else {
                odds[category][k + '_' + v] = 0;
            }
        }
    }

    // Set up a new object that will contain sums of these odds by category
    var oddsSums = {};

    for (category in odds) {
        // Tally all of the odds for each category-combination pair -
        // the non-existence of a category does not add anything to the
        // score.
        oddsSums[category] = 0;
        for (var combination in odds[category]) {
            oddsSums[category] += odds[category][combination];
        }
    }

    return oddsSums;
};

module.exports = BayesianClassifier;

},{}],9:[function(require,module,exports){
'use strict';
/* @flow */

var binomialDistribution = require('./binomial_distribution');

/**
 * The [Bernoulli distribution](http://en.wikipedia.org/wiki/Bernoulli_distribution)
 * is the probability discrete
 * distribution of a random variable which takes value 1 with success
 * probability `p` and value 0 with failure
 * probability `q` = 1 - `p`. It can be used, for example, to represent the
 * toss of a coin, where "1" is defined to mean "heads" and "0" is defined
 * to mean "tails" (or vice versa). It is
 * a special case of a Binomial Distribution
 * where `n` = 1.
 *
 * @param {number} p input value, between 0 and 1 inclusive
 * @returns {number} value of bernoulli distribution at this point
 * @example
 * bernoulliDistribution(0.5); // => { '0': 0.5, '1': 0.5 }
 */
function bernoulliDistribution(p/*: number */) {
    // Check that `p` is a valid probability (0 ≤ p ≤ 1)
    if (p < 0 || p > 1 ) { return NaN; }

    return binomialDistribution(1, p);
}

module.exports = bernoulliDistribution;

},{"./binomial_distribution":10}],10:[function(require,module,exports){
'use strict';
/* @flow */

var epsilon = require('./epsilon');
var factorial = require('./factorial');

/**
 * The [Binomial Distribution](http://en.wikipedia.org/wiki/Binomial_distribution) is the discrete probability
 * distribution of the number of successes in a sequence of n independent yes/no experiments, each of which yields
 * success with probability `probability`. Such a success/failure experiment is also called a Bernoulli experiment or
 * Bernoulli trial; when trials = 1, the Binomial Distribution is a Bernoulli Distribution.
 *
 * @param {number} trials number of trials to simulate
 * @param {number} probability
 * @returns {Object} output
 */
function binomialDistribution(
    trials/*: number */,
    probability/*: number */)/*: ?Object */ {
    // Check that `p` is a valid probability (0 ≤ p ≤ 1),
    // that `n` is an integer, strictly positive.
    if (probability < 0 || probability > 1 ||
        trials <= 0 || trials % 1 !== 0) {
        return undefined;
    }

    // We initialize `x`, the random variable, and `accumulator`, an accumulator
    // for the cumulative distribution function to 0. `distribution_functions`
    // is the object we'll return with the `probability_of_x` and the
    // `cumulativeProbability_of_x`, as well as the calculated mean &
    // variance. We iterate until the `cumulativeProbability_of_x` is
    // within `epsilon` of 1.0.
    var x = 0,
        cumulativeProbability = 0,
        cells = {};

    // This algorithm iterates through each potential outcome,
    // until the `cumulativeProbability` is very close to 1, at
    // which point we've defined the vast majority of outcomes
    do {
        // a [probability mass function](https://en.wikipedia.org/wiki/Probability_mass_function)
        cells[x] = factorial(trials) /
            (factorial(x) * factorial(trials - x)) *
            (Math.pow(probability, x) * Math.pow(1 - probability, trials - x));
        cumulativeProbability += cells[x];
        x++;
    // when the cumulativeProbability is nearly 1, we've calculated
    // the useful range of this distribution
    } while (cumulativeProbability < 1 - epsilon);

    return cells;
}

module.exports = binomialDistribution;

},{"./epsilon":19,"./factorial":22}],11:[function(require,module,exports){
'use strict';
/* @flow */

var sign = require('./sign');
/**
 * [Bisection method](https://en.wikipedia.org/wiki/Bisection_method) is a root-finding 
 * method that repeatedly bisects an interval to find the root.
 * 
 * This function returns a numerical approximation to the exact value.
 * 
 * @param {Function} func input function
 * @param {Number} start - start of interval
 * @param {Number} end - end of interval
 * @param {Number} maxIterations - the maximum number of iterations
 * @param {Number} errorTolerance - the error tolerance
 * @returns {Number} estimated root value
 * @throws {TypeError} Argument func must be a function
 * 
 * @example
 * bisect(Math.cos,0,4,100,0.003); // => 1.572265625
 */
function bisect(
    func/*: (x: any) => number */,
    start/*: number */,
    end/*: number */,
    maxIterations/*: number */,
    errorTolerance/*: number */)/*:number*/ {

    if (typeof func !== 'function') throw new TypeError('func must be a function');
    
    for (var i = 0; i < maxIterations; i++) {
        var output = (start + end) / 2;

        if (func(output) === 0 || Math.abs((end - start) / 2) < errorTolerance) {
            return output;
        }

        if (sign(func(output)) === sign(func(start))) {
            start = output;
        } else {
            end = output;
        }
    }
    
    throw new Error('maximum number of iterations exceeded');
}

module.exports = bisect;

},{"./sign":61}],12:[function(require,module,exports){
'use strict';
/* @flow */

/**
 * **Percentage Points of the χ2 (Chi-Squared) Distribution**
 *
 * The [χ2 (Chi-Squared) Distribution](http://en.wikipedia.org/wiki/Chi-squared_distribution) is used in the common
 * chi-squared tests for goodness of fit of an observed distribution to a theoretical one, the independence of two
 * criteria of classification of qualitative data, and in confidence interval estimation for a population standard
 * deviation of a normal distribution from a sample standard deviation.
 *
 * Values from Appendix 1, Table III of William W. Hines & Douglas C. Montgomery, "Probability and Statistics in
 * Engineering and Management Science", Wiley (1980).
 */
var chiSquaredDistributionTable = {
    '1': {
        '0.995': 0,
        '0.99': 0,
        '0.975': 0,
        '0.95': 0,
        '0.9': 0.02,
        '0.5': 0.45,
        '0.1': 2.71,
        '0.05': 3.84,
        '0.025': 5.02,
        '0.01': 6.63,
        '0.005': 7.88
    },
    '2': {
        '0.995': 0.01,
        '0.99': 0.02,
        '0.975': 0.05,
        '0.95': 0.1,
        '0.9': 0.21,
        '0.5': 1.39,
        '0.1': 4.61,
        '0.05': 5.99,
        '0.025': 7.38,
        '0.01': 9.21,
        '0.005': 10.6
    },
    '3': {
        '0.995': 0.07,
        '0.99': 0.11,
        '0.975': 0.22,
        '0.95': 0.35,
        '0.9': 0.58,
        '0.5': 2.37,
        '0.1': 6.25,
        '0.05': 7.81,
        '0.025': 9.35,
        '0.01': 11.34,
        '0.005': 12.84
    },
    '4': {
        '0.995': 0.21,
        '0.99': 0.3,
        '0.975': 0.48,
        '0.95': 0.71,
        '0.9': 1.06,
        '0.5': 3.36,
        '0.1': 7.78,
        '0.05': 9.49,
        '0.025': 11.14,
        '0.01': 13.28,
        '0.005': 14.86
    },
    '5': {
        '0.995': 0.41,
        '0.99': 0.55,
        '0.975': 0.83,
        '0.95': 1.15,
        '0.9': 1.61,
        '0.5': 4.35,
        '0.1': 9.24,
        '0.05': 11.07,
        '0.025': 12.83,
        '0.01': 15.09,
        '0.005': 16.75
    },
    '6': {
        '0.995': 0.68,
        '0.99': 0.87,
        '0.975': 1.24,
        '0.95': 1.64,
        '0.9': 2.2,
        '0.5': 5.35,
        '0.1': 10.65,
        '0.05': 12.59,
        '0.025': 14.45,
        '0.01': 16.81,
        '0.005': 18.55
    },
    '7': {
        '0.995': 0.99,
        '0.99': 1.25,
        '0.975': 1.69,
        '0.95': 2.17,
        '0.9': 2.83,
        '0.5': 6.35,
        '0.1': 12.02,
        '0.05': 14.07,
        '0.025': 16.01,
        '0.01': 18.48,
        '0.005': 20.28
    },
    '8': {
        '0.995': 1.34,
        '0.99': 1.65,
        '0.975': 2.18,
        '0.95': 2.73,
        '0.9': 3.49,
        '0.5': 7.34,
        '0.1': 13.36,
        '0.05': 15.51,
        '0.025': 17.53,
        '0.01': 20.09,
        '0.005': 21.96
    },
    '9': {
        '0.995': 1.73,
        '0.99': 2.09,
        '0.975': 2.7,
        '0.95': 3.33,
        '0.9': 4.17,
        '0.5': 8.34,
        '0.1': 14.68,
        '0.05': 16.92,
        '0.025': 19.02,
        '0.01': 21.67,
        '0.005': 23.59
    },
    '10': {
        '0.995': 2.16,
        '0.99': 2.56,
        '0.975': 3.25,
        '0.95': 3.94,
        '0.9': 4.87,
        '0.5': 9.34,
        '0.1': 15.99,
        '0.05': 18.31,
        '0.025': 20.48,
        '0.01': 23.21,
        '0.005': 25.19
    },
    '11': {
        '0.995': 2.6,
        '0.99': 3.05,
        '0.975': 3.82,
        '0.95': 4.57,
        '0.9': 5.58,
        '0.5': 10.34,
        '0.1': 17.28,
        '0.05': 19.68,
        '0.025': 21.92,
        '0.01': 24.72,
        '0.005': 26.76
    },
    '12': {
        '0.995': 3.07,
        '0.99': 3.57,
        '0.975': 4.4,
        '0.95': 5.23,
        '0.9': 6.3,
        '0.5': 11.34,
        '0.1': 18.55,
        '0.05': 21.03,
        '0.025': 23.34,
        '0.01': 26.22,
        '0.005': 28.3
    },
    '13': {
        '0.995': 3.57,
        '0.99': 4.11,
        '0.975': 5.01,
        '0.95': 5.89,
        '0.9': 7.04,
        '0.5': 12.34,
        '0.1': 19.81,
        '0.05': 22.36,
        '0.025': 24.74,
        '0.01': 27.69,
        '0.005': 29.82
    },
    '14': {
        '0.995': 4.07,
        '0.99': 4.66,
        '0.975': 5.63,
        '0.95': 6.57,
        '0.9': 7.79,
        '0.5': 13.34,
        '0.1': 21.06,
        '0.05': 23.68,
        '0.025': 26.12,
        '0.01': 29.14,
        '0.005': 31.32
    },
    '15': {
        '0.995': 4.6,
        '0.99': 5.23,
        '0.975': 6.27,
        '0.95': 7.26,
        '0.9': 8.55,
        '0.5': 14.34,
        '0.1': 22.31,
        '0.05': 25,
        '0.025': 27.49,
        '0.01': 30.58,
        '0.005': 32.8
    },
    '16': {
        '0.995': 5.14,
        '0.99': 5.81,
        '0.975': 6.91,
        '0.95': 7.96,
        '0.9': 9.31,
        '0.5': 15.34,
        '0.1': 23.54,
        '0.05': 26.3,
        '0.025': 28.85,
        '0.01': 32,
        '0.005': 34.27
    },
    '17': {
        '0.995': 5.7,
        '0.99': 6.41,
        '0.975': 7.56,
        '0.95': 8.67,
        '0.9': 10.09,
        '0.5': 16.34,
        '0.1': 24.77,
        '0.05': 27.59,
        '0.025': 30.19,
        '0.01': 33.41,
        '0.005': 35.72
    },
    '18': {
        '0.995': 6.26,
        '0.99': 7.01,
        '0.975': 8.23,
        '0.95': 9.39,
        '0.9': 10.87,
        '0.5': 17.34,
        '0.1': 25.99,
        '0.05': 28.87,
        '0.025': 31.53,
        '0.01': 34.81,
        '0.005': 37.16
    },
    '19': {
        '0.995': 6.84,
        '0.99': 7.63,
        '0.975': 8.91,
        '0.95': 10.12,
        '0.9': 11.65,
        '0.5': 18.34,
        '0.1': 27.2,
        '0.05': 30.14,
        '0.025': 32.85,
        '0.01': 36.19,
        '0.005': 38.58
    },
    '20': {
        '0.995': 7.43,
        '0.99': 8.26,
        '0.975': 9.59,
        '0.95': 10.85,
        '0.9': 12.44,
        '0.5': 19.34,
        '0.1': 28.41,
        '0.05': 31.41,
        '0.025': 34.17,
        '0.01': 37.57,
        '0.005': 40
    },
    '21': {
        '0.995': 8.03,
        '0.99': 8.9,
        '0.975': 10.28,
        '0.95': 11.59,
        '0.9': 13.24,
        '0.5': 20.34,
        '0.1': 29.62,
        '0.05': 32.67,
        '0.025': 35.48,
        '0.01': 38.93,
        '0.005': 41.4
    },
    '22': {
        '0.995': 8.64,
        '0.99': 9.54,
        '0.975': 10.98,
        '0.95': 12.34,
        '0.9': 14.04,
        '0.5': 21.34,
        '0.1': 30.81,
        '0.05': 33.92,
        '0.025': 36.78,
        '0.01': 40.29,
        '0.005': 42.8
    },
    '23': {
        '0.995': 9.26,
        '0.99': 10.2,
        '0.975': 11.69,
        '0.95': 13.09,
        '0.9': 14.85,
        '0.5': 22.34,
        '0.1': 32.01,
        '0.05': 35.17,
        '0.025': 38.08,
        '0.01': 41.64,
        '0.005': 44.18
    },
    '24': {
        '0.995': 9.89,
        '0.99': 10.86,
        '0.975': 12.4,
        '0.95': 13.85,
        '0.9': 15.66,
        '0.5': 23.34,
        '0.1': 33.2,
        '0.05': 36.42,
        '0.025': 39.36,
        '0.01': 42.98,
        '0.005': 45.56
    },
    '25': {
        '0.995': 10.52,
        '0.99': 11.52,
        '0.975': 13.12,
        '0.95': 14.61,
        '0.9': 16.47,
        '0.5': 24.34,
        '0.1': 34.28,
        '0.05': 37.65,
        '0.025': 40.65,
        '0.01': 44.31,
        '0.005': 46.93
    },
    '26': {
        '0.995': 11.16,
        '0.99': 12.2,
        '0.975': 13.84,
        '0.95': 15.38,
        '0.9': 17.29,
        '0.5': 25.34,
        '0.1': 35.56,
        '0.05': 38.89,
        '0.025': 41.92,
        '0.01': 45.64,
        '0.005': 48.29
    },
    '27': {
        '0.995': 11.81,
        '0.99': 12.88,
        '0.975': 14.57,
        '0.95': 16.15,
        '0.9': 18.11,
        '0.5': 26.34,
        '0.1': 36.74,
        '0.05': 40.11,
        '0.025': 43.19,
        '0.01': 46.96,
        '0.005': 49.65
    },
    '28': {
        '0.995': 12.46,
        '0.99': 13.57,
        '0.975': 15.31,
        '0.95': 16.93,
        '0.9': 18.94,
        '0.5': 27.34,
        '0.1': 37.92,
        '0.05': 41.34,
        '0.025': 44.46,
        '0.01': 48.28,
        '0.005': 50.99
    },
    '29': {
        '0.995': 13.12,
        '0.99': 14.26,
        '0.975': 16.05,
        '0.95': 17.71,
        '0.9': 19.77,
        '0.5': 28.34,
        '0.1': 39.09,
        '0.05': 42.56,
        '0.025': 45.72,
        '0.01': 49.59,
        '0.005': 52.34
    },
    '30': {
        '0.995': 13.79,
        '0.99': 14.95,
        '0.975': 16.79,
        '0.95': 18.49,
        '0.9': 20.6,
        '0.5': 29.34,
        '0.1': 40.26,
        '0.05': 43.77,
        '0.025': 46.98,
        '0.01': 50.89,
        '0.005': 53.67
    },
    '40': {
        '0.995': 20.71,
        '0.99': 22.16,
        '0.975': 24.43,
        '0.95': 26.51,
        '0.9': 29.05,
        '0.5': 39.34,
        '0.1': 51.81,
        '0.05': 55.76,
        '0.025': 59.34,
        '0.01': 63.69,
        '0.005': 66.77
    },
    '50': {
        '0.995': 27.99,
        '0.99': 29.71,
        '0.975': 32.36,
        '0.95': 34.76,
        '0.9': 37.69,
        '0.5': 49.33,
        '0.1': 63.17,
        '0.05': 67.5,
        '0.025': 71.42,
        '0.01': 76.15,
        '0.005': 79.49
    },
    '60': {
        '0.995': 35.53,
        '0.99': 37.48,
        '0.975': 40.48,
        '0.95': 43.19,
        '0.9': 46.46,
        '0.5': 59.33,
        '0.1': 74.4,
        '0.05': 79.08,
        '0.025': 83.3,
        '0.01': 88.38,
        '0.005': 91.95
    },
    '70': {
        '0.995': 43.28,
        '0.99': 45.44,
        '0.975': 48.76,
        '0.95': 51.74,
        '0.9': 55.33,
        '0.5': 69.33,
        '0.1': 85.53,
        '0.05': 90.53,
        '0.025': 95.02,
        '0.01': 100.42,
        '0.005': 104.22
    },
    '80': {
        '0.995': 51.17,
        '0.99': 53.54,
        '0.975': 57.15,
        '0.95': 60.39,
        '0.9': 64.28,
        '0.5': 79.33,
        '0.1': 96.58,
        '0.05': 101.88,
        '0.025': 106.63,
        '0.01': 112.33,
        '0.005': 116.32
    },
    '90': {
        '0.995': 59.2,
        '0.99': 61.75,
        '0.975': 65.65,
        '0.95': 69.13,
        '0.9': 73.29,
        '0.5': 89.33,
        '0.1': 107.57,
        '0.05': 113.14,
        '0.025': 118.14,
        '0.01': 124.12,
        '0.005': 128.3
    },
    '100': {
        '0.995': 67.33,
        '0.99': 70.06,
        '0.975': 74.22,
        '0.95': 77.93,
        '0.9': 82.36,
        '0.5': 99.33,
        '0.1': 118.5,
        '0.05': 124.34,
        '0.025': 129.56,
        '0.01': 135.81,
        '0.005': 140.17
    }
};

module.exports = chiSquaredDistributionTable;

},{}],13:[function(require,module,exports){
'use strict';
/* @flow */

var mean = require('./mean');
var chiSquaredDistributionTable = require('./chi_squared_distribution_table');

/**
 * The [χ2 (Chi-Squared) Goodness-of-Fit Test](http://en.wikipedia.org/wiki/Goodness_of_fit#Pearson.27s_chi-squared_test)
 * uses a measure of goodness of fit which is the sum of differences between observed and expected outcome frequencies
 * (that is, counts of observations), each squared and divided by the number of observations expected given the
 * hypothesized distribution. The resulting χ2 statistic, `chiSquared`, can be compared to the chi-squared distribution
 * to determine the goodness of fit. In order to determine the degrees of freedom of the chi-squared distribution, one
 * takes the total number of observed frequencies and subtracts the number of estimated parameters. The test statistic
 * follows, approximately, a chi-square distribution with (k − c) degrees of freedom where `k` is the number of non-empty
 * cells and `c` is the number of estimated parameters for the distribution.
 *
 * @param {Array<number>} data
 * @param {Function} distributionType a function that returns a point in a distribution:
 * for instance, binomial, bernoulli, or poisson
 * @param {number} significance
 * @returns {number} chi squared goodness of fit
 * @example
 * // Data from Poisson goodness-of-fit example 10-19 in William W. Hines & Douglas C. Montgomery,
 * // "Probability and Statistics in Engineering and Management Science", Wiley (1980).
 * var data1019 = [
 *     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 *     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 *     1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
 *     2, 2, 2, 2, 2, 2, 2, 2, 2,
 *     3, 3, 3, 3
 * ];
 * ss.chiSquaredGoodnessOfFit(data1019, ss.poissonDistribution, 0.05)); //= false
 */
function chiSquaredGoodnessOfFit(
    data/*: Array<number> */,
    distributionType/*: Function */,
    significance/*: number */)/*: boolean */ {
    // Estimate from the sample data, a weighted mean.
    var inputMean = mean(data),
        // Calculated value of the χ2 statistic.
        chiSquared = 0,
        // Degrees of freedom, calculated as (number of class intervals -
        // number of hypothesized distribution parameters estimated - 1)
        degreesOfFreedom,
        // Number of hypothesized distribution parameters estimated, expected to be supplied in the distribution test.
        // Lose one degree of freedom for estimating `lambda` from the sample data.
        c = 1,
        // The hypothesized distribution.
        // Generate the hypothesized distribution.
        hypothesizedDistribution = distributionType(inputMean),
        observedFrequencies = [],
        expectedFrequencies = [],
        k;

    // Create an array holding a histogram from the sample data, of
    // the form `{ value: numberOfOcurrences }`
    for (var i = 0; i < data.length; i++) {
        if (observedFrequencies[data[i]] === undefined) {
            observedFrequencies[data[i]] = 0;
        }
        observedFrequencies[data[i]]++;
    }

    // The histogram we created might be sparse - there might be gaps
    // between values. So we iterate through the histogram, making
    // sure that instead of undefined, gaps have 0 values.
    for (i = 0; i < observedFrequencies.length; i++) {
        if (observedFrequencies[i] === undefined) {
            observedFrequencies[i] = 0;
        }
    }

    // Create an array holding a histogram of expected data given the
    // sample size and hypothesized distribution.
    for (k in hypothesizedDistribution) {
        if (k in observedFrequencies) {
            expectedFrequencies[+k] = hypothesizedDistribution[k] * data.length;
        }
    }

    // Working backward through the expected frequencies, collapse classes
    // if less than three observations are expected for a class.
    // This transformation is applied to the observed frequencies as well.
    for (k = expectedFrequencies.length - 1; k >= 0; k--) {
        if (expectedFrequencies[k] < 3) {
            expectedFrequencies[k - 1] += expectedFrequencies[k];
            expectedFrequencies.pop();

            observedFrequencies[k - 1] += observedFrequencies[k];
            observedFrequencies.pop();
        }
    }

    // Iterate through the squared differences between observed & expected
    // frequencies, accumulating the `chiSquared` statistic.
    for (k = 0; k < observedFrequencies.length; k++) {
        chiSquared += Math.pow(
            observedFrequencies[k] - expectedFrequencies[k], 2) /
            expectedFrequencies[k];
    }

    // Calculate degrees of freedom for this test and look it up in the
    // `chiSquaredDistributionTable` in order to
    // accept or reject the goodness-of-fit of the hypothesized distribution.
    degreesOfFreedom = observedFrequencies.length - c - 1;
    return chiSquaredDistributionTable[degreesOfFreedom][significance] < chiSquared;
}

module.exports = chiSquaredGoodnessOfFit;

},{"./chi_squared_distribution_table":12,"./mean":31}],14:[function(require,module,exports){
'use strict';
/* @flow */

/**
 * Split an array into chunks of a specified size. This function
 * has the same behavior as [PHP's array_chunk](http://php.net/manual/en/function.array-chunk.php)
 * function, and thus will insert smaller-sized chunks at the end if
 * the input size is not divisible by the chunk size.
 *
 * `sample` is expected to be an array, and `chunkSize` a number.
 * The `sample` array can contain any kind of data.
 *
 * @param {Array} sample any array of values
 * @param {number} chunkSize size of each output array
 * @returns {Array<Array>} a chunked array
 * @example
 * chunk([1, 2, 3, 4, 5, 6], 2);
 * // => [[1, 2], [3, 4], [5, 6]]
 */
function chunk(sample/*:Array<any>*/, chunkSize/*:number*/)/*:?Array<Array<any>>*/ {

    // a list of result chunks, as arrays in an array
    var output = [];

    // `chunkSize` must be zero or higher - otherwise the loop below,
    // in which we call `start += chunkSize`, will loop infinitely.
    // So, we'll detect and throw in that case to indicate
    // invalid input.
    if (chunkSize <= 0) {
        throw new Error('chunk size must be a positive integer');
    }

    // `start` is the index at which `.slice` will start selecting
    // new array elements
    for (var start = 0; start < sample.length; start += chunkSize) {

        // for each chunk, slice that part of the array and add it
        // to the output. The `.slice` function does not change
        // the original array.
        output.push(sample.slice(start, start + chunkSize));
    }
    return output;
}

module.exports = chunk;

},{}],15:[function(require,module,exports){
'use strict';
/* @flow */

var uniqueCountSorted = require('./unique_count_sorted'),
    numericSort = require('./numeric_sort');

/**
 * Create a new column x row matrix.
 *
 * @private
 * @param {number} columns
 * @param {number} rows
 * @return {Array<Array<number>>} matrix
 * @example
 * makeMatrix(10, 10);
 */
function makeMatrix(columns, rows) {
    var matrix = [];
    for (var i = 0; i < columns; i++) {
        var column = [];
        for (var j = 0; j < rows; j++) {
            column.push(0);
        }
        matrix.push(column);
    }
    return matrix;
}

/**
 * Generates incrementally computed values based on the sums and sums of
 * squares for the data array
 *
 * @private
 * @param {number} j
 * @param {number} i
 * @param {Array<number>} sums
 * @param {Array<number>} sumsOfSquares
 * @return {number}
 * @example
 * ssq(0, 1, [-1, 0, 2], [1, 1, 5]);
 */
function ssq(j, i, sums, sumsOfSquares) {
    var sji; // s(j, i)
    if (j > 0) {
        var muji = (sums[i] - sums[j - 1]) / (i - j + 1); // mu(j, i)
        sji = sumsOfSquares[i] - sumsOfSquares[j - 1] - (i - j + 1) * muji * muji;
    } else {
        sji = sumsOfSquares[i] - sums[i] * sums[i] / (i + 1);
    }
    if (sji < 0) {
        return 0;
    }
    return sji;
}

/**
 * Function that recursively divides and conquers computations
 * for cluster j
 *
 * @private
 * @param {number} iMin Minimum index in cluster to be computed
 * @param {number} iMax Maximum index in cluster to be computed
 * @param {number} cluster Index of the cluster currently being computed
 * @param {Array<Array<number>>} matrix
 * @param {Array<Array<number>>} backtrackMatrix
 * @param {Array<number>} sums
 * @param {Array<number>} sumsOfSquares
 */
function fillMatrixColumn(iMin, iMax, cluster, matrix, backtrackMatrix, sums, sumsOfSquares) {
    if (iMin > iMax) {
        return;
    }

    // Start at midpoint between iMin and iMax
    var i = Math.floor((iMin + iMax) / 2);

    matrix[cluster][i] = matrix[cluster - 1][i - 1];
    backtrackMatrix[cluster][i] = i;

    var jlow = cluster; // the lower end for j

    if (iMin > cluster) {
        jlow = Math.max(jlow, backtrackMatrix[cluster][iMin - 1] || 0);
    }
    jlow = Math.max(jlow, backtrackMatrix[cluster - 1][i] || 0);

    var jhigh = i - 1; // the upper end for j
    if (iMax < matrix.length - 1) {
        jhigh = Math.min(jhigh, backtrackMatrix[cluster][iMax + 1] || 0);
    }

    var sji;
    var sjlowi;
    var ssqjlow;
    var ssqj;
    for (var j = jhigh; j >= jlow; --j) {
        sji = ssq(j, i, sums, sumsOfSquares);

        if (sji + matrix[cluster - 1][jlow - 1] >= matrix[cluster][i]) {
            break;
        }

        // Examine the lower bound of the cluster border
        sjlowi = ssq(jlow, i, sums, sumsOfSquares);

        ssqjlow = sjlowi + matrix[cluster - 1][jlow - 1];

        if (ssqjlow < matrix[cluster][i]) {
            // Shrink the lower bound
            matrix[cluster][i] = ssqjlow;
            backtrackMatrix[cluster][i] = jlow;
        }
        jlow++;

        ssqj = sji + matrix[cluster - 1][j - 1];
        if (ssqj < matrix[cluster][i]) {
            matrix[cluster][i] = ssqj;
            backtrackMatrix[cluster][i] = j;
        }
    }

    fillMatrixColumn(iMin, i - 1, cluster, matrix, backtrackMatrix, sums, sumsOfSquares);
    fillMatrixColumn(i + 1, iMax, cluster, matrix, backtrackMatrix, sums, sumsOfSquares);
}

/**
 * Initializes the main matrices used in Ckmeans and kicks
 * off the divide and conquer cluster computation strategy
 *
 * @private
 * @param {Array<number>} data sorted array of values
 * @param {Array<Array<number>>} matrix
 * @param {Array<Array<number>>} backtrackMatrix
 */
function fillMatrices(data, matrix, backtrackMatrix) {
    var nValues = matrix[0].length;

    // Shift values by the median to improve numeric stability
    var shift = data[Math.floor(nValues / 2)];

    // Cumulative sum and cumulative sum of squares for all values in data array
    var sums = [];
    var sumsOfSquares = [];

    // Initialize first column in matrix & backtrackMatrix
    for (var i = 0, shiftedValue; i < nValues; ++i) {
        shiftedValue = data[i] - shift;
        if (i === 0) {
            sums.push(shiftedValue);
            sumsOfSquares.push(shiftedValue * shiftedValue);
        } else {
            sums.push(sums[i - 1] + shiftedValue);
            sumsOfSquares.push(sumsOfSquares[i - 1] + shiftedValue * shiftedValue);
        }

        // Initialize for cluster = 0
        matrix[0][i] = ssq(0, i, sums, sumsOfSquares);
        backtrackMatrix[0][i] = 0;
    }

    // Initialize the rest of the columns
    var iMin;
    for (var cluster = 1; cluster < matrix.length; ++cluster) {
        if (cluster < matrix.length - 1) {
            iMin = cluster;
        } else {
            // No need to compute matrix[K-1][0] ... matrix[K-1][N-2]
            iMin = nValues - 1;
        }

        fillMatrixColumn(iMin, nValues - 1, cluster, matrix, backtrackMatrix, sums, sumsOfSquares);
    }
}

/**
 * Ckmeans clustering is an improvement on heuristic-based clustering
 * approaches like Jenks. The algorithm was developed in
 * [Haizhou Wang and Mingzhou Song](http://journal.r-project.org/archive/2011-2/RJournal_2011-2_Wang+Song.pdf)
 * as a [dynamic programming](https://en.wikipedia.org/wiki/Dynamic_programming) approach
 * to the problem of clustering numeric data into groups with the least
 * within-group sum-of-squared-deviations.
 *
 * Minimizing the difference within groups - what Wang & Song refer to as
 * `withinss`, or within sum-of-squares, means that groups are optimally
 * homogenous within and the data is split into representative groups.
 * This is very useful for visualization, where you may want to represent
 * a continuous variable in discrete color or style groups. This function
 * can provide groups that emphasize differences between data.
 *
 * Being a dynamic approach, this algorithm is based on two matrices that
 * store incrementally-computed values for squared deviations and backtracking
 * indexes.
 *
 * This implementation is based on Ckmeans 3.4.6, which introduced a new divide
 * and conquer approach that improved runtime from O(kn^2) to O(kn log(n)).
 *
 * Unlike the [original implementation](https://cran.r-project.org/web/packages/Ckmeans.1d.dp/index.html),
 * this implementation does not include any code to automatically determine
 * the optimal number of clusters: this information needs to be explicitly
 * provided.
 *
 * ### References
 * _Ckmeans.1d.dp: Optimal k-means Clustering in One Dimension by Dynamic
 * Programming_ Haizhou Wang and Mingzhou Song ISSN 2073-4859
 *
 * from The R Journal Vol. 3/2, December 2011
 * @param {Array<number>} data input data, as an array of number values
 * @param {number} nClusters number of desired classes. This cannot be
 * greater than the number of values in the data array.
 * @returns {Array<Array<number>>} clustered input
 * @example
 * ckmeans([-1, 2, -1, 2, 4, 5, 6, -1, 2, -1], 3);
 * // The input, clustered into groups of similar numbers.
 * //= [[-1, -1, -1, -1], [2, 2, 2], [4, 5, 6]]);
 */
function ckmeans(data/*: Array<number> */, nClusters/*: number */)/*: Array<Array<number>> */ {

    if (nClusters > data.length) {
        throw new Error('Cannot generate more classes than there are data values');
    }

    var sorted = numericSort(data),
        // we'll use this as the maximum number of clusters
        uniqueCount = uniqueCountSorted(sorted);

    // if all of the input values are identical, there's one cluster
    // with all of the input in it.
    if (uniqueCount === 1) {
        return [sorted];
    }

    // named 'S' originally
    var matrix = makeMatrix(nClusters, sorted.length),
        // named 'J' originally
        backtrackMatrix = makeMatrix(nClusters, sorted.length);

    // This is a dynamic programming way to solve the problem of minimizing
    // within-cluster sum of squares. It's similar to linear regression
    // in this way, and this calculation incrementally computes the
    // sum of squares that are later read.
    fillMatrices(sorted, matrix, backtrackMatrix);

    // The real work of Ckmeans clustering happens in the matrix generation:
    // the generated matrices encode all possible clustering combinations, and
    // once they're generated we can solve for the best clustering groups
    // very quickly.
    var clusters = [],
        clusterRight = backtrackMatrix[0].length - 1;

    // Backtrack the clusters from the dynamic programming matrix. This
    // starts at the bottom-right corner of the matrix (if the top-left is 0, 0),
    // and moves the cluster target with the loop.
    for (var cluster = backtrackMatrix.length - 1; cluster >= 0; cluster--) {

        var clusterLeft = backtrackMatrix[cluster][clusterRight];

        // fill the cluster from the sorted input by taking a slice of the
        // array. the backtrack matrix makes this easy - it stores the
        // indexes where the cluster should start and end.
        clusters[cluster] = sorted.slice(clusterLeft, clusterRight + 1);

        if (cluster > 0) {
            clusterRight = clusterLeft - 1;
        }
    }

    return clusters;
}

module.exports = ckmeans;

},{"./numeric_sort":41,"./unique_count_sorted":69}],16:[function(require,module,exports){
/* @flow */
'use strict';
/**
 * Implementation of Combinations
 * Combinations are unique subsets of a collection - in this case, k elements from a collection at a time.
 * https://en.wikipedia.org/wiki/Combination
 * @param {Array} elements any type of data
 * @param {int} k the number of objects in each group (without replacement)
 * @returns {Array<Array>} array of permutations
 * @example
 * combinations([1, 2, 3], 2); // => [[1,2], [1,3], [2,3]]
 */

function combinations(elements /*: Array<any> */, k/*: number */) {
    var i;
    var subI;
    var combinationList = [];
    var subsetCombinations;
    var next;

    for (i = 0; i < elements.length; i++) {
        if (k === 1) {
            combinationList.push([elements[i]])
        } else {
            subsetCombinations = combinations(elements.slice( i + 1, elements.length ), k - 1);
            for (subI = 0; subI < subsetCombinations.length; subI++) {
                next = subsetCombinations[subI];
                next.unshift(elements[i]);
                combinationList.push(next);
            }
        }
    }
    return combinationList;
}

module.exports = combinations;

},{}],17:[function(require,module,exports){
/* @flow */
'use strict';

/**
 * Implementation of [Combinations](https://en.wikipedia.org/wiki/Combination) with replacement
 * Combinations are unique subsets of a collection - in this case, k elements from a collection at a time.
 * 'With replacement' means that a given element can be chosen multiple times.
 * Unlike permutation, order doesn't matter for combinations.
 * 
 * @param {Array} elements any type of data
 * @param {int} k the number of objects in each group (without replacement)
 * @returns {Array<Array>} array of permutations
 * @example
 * combinationsReplacement([1, 2], 2); // => [[1, 1], [1, 2], [2, 2]]
 */
function combinationsReplacement(
    elements /*: Array<any> */,
    k /*: number */) {

    var combinationList = [];

    for (var i = 0; i < elements.length; i++) {
        if (k === 1) {
            // If we're requested to find only one element, we don't need
            // to recurse: just push `elements[i]` onto the list of combinations.
            combinationList.push([elements[i]])
        } else {
            // Otherwise, recursively find combinations, given `k - 1`. Note that
            // we request `k - 1`, so if you were looking for k=3 combinations, we're
            // requesting k=2. This -1 gets reversed in the for loop right after this
            // code, since we concatenate `elements[i]` onto the selected combinations,
            // bringing `k` back up to your requested level.
            // This recursion may go many levels deep, since it only stops once
            // k=1.
            var subsetCombinations = combinationsReplacement(
                elements.slice(i, elements.length),
                k - 1);

            for (var j = 0; j < subsetCombinations.length; j++) {
                combinationList.push([elements[i]]
                    .concat(subsetCombinations[j]));
            }
        }
    }

    return combinationList;
}

module.exports = combinationsReplacement;

},{}],18:[function(require,module,exports){
'use strict';
/* @flow */

var standardNormalTable = require('./standard_normal_table');

/**
 * **[Cumulative Standard Normal Probability](http://en.wikipedia.org/wiki/Standard_normal_table)**
 *
 * Since probability tables cannot be
 * printed for every normal distribution, as there are an infinite variety
 * of normal distributions, it is common practice to convert a normal to a
 * standard normal and then use the standard normal table to find probabilities.
 *
 * You can use `.5 + .5 * errorFunction(x / Math.sqrt(2))` to calculate the probability
 * instead of looking it up in a table.
 *
 * @param {number} z
 * @returns {number} cumulative standard normal probability
 */
function cumulativeStdNormalProbability(z /*:number */)/*:number */ {

    // Calculate the position of this value.
    var absZ = Math.abs(z),
        // Each row begins with a different
        // significant digit: 0.5, 0.6, 0.7, and so on. Each value in the table
        // corresponds to a range of 0.01 in the input values, so the value is
        // multiplied by 100.
        index = Math.min(Math.round(absZ * 100), standardNormalTable.length - 1);

    // The index we calculate must be in the table as a positive value,
    // but we still pay attention to whether the input is positive
    // or negative, and flip the output value as a last step.
    if (z >= 0) {
        return standardNormalTable[index];
    } else {
        // due to floating-point arithmetic, values in the table with
        // 4 significant figures can nevertheless end up as repeating
        // fractions when they're computed here.
        return +(1 - standardNormalTable[index]).toFixed(4);
    }
}

module.exports = cumulativeStdNormalProbability;

},{"./standard_normal_table":63}],19:[function(require,module,exports){
'use strict';
/* @flow */

/**
 * We use `ε`, epsilon, as a stopping criterion when we want to iterate
 * until we're "close enough". Epsilon is a very small number: for
 * simple statistics, that number is **0.0001**
 *
 * This is used in calculations like the binomialDistribution, in which
 * the process of finding a value is [iterative](https://en.wikipedia.org/wiki/Iterative_method):
 * it progresses until it is close enough.
 *
 * Below is an example of using epsilon in [gradient descent](https://en.wikipedia.org/wiki/Gradient_descent),
 * where we're trying to find a local minimum of a function's derivative,
 * given by the `fDerivative` method.
 *
 * @example
 * // From calculation, we expect that the local minimum occurs at x=9/4
 * var x_old = 0;
 * // The algorithm starts at x=6
 * var x_new = 6;
 * var stepSize = 0.01;
 *
 * function fDerivative(x) {
 *   return 4 * Math.pow(x, 3) - 9 * Math.pow(x, 2);
 * }
 *
 * // The loop runs until the difference between the previous
 * // value and the current value is smaller than epsilon - a rough
 * // meaure of 'close enough'
 * while (Math.abs(x_new - x_old) > ss.epsilon) {
 *   x_old = x_new;
 *   x_new = x_old - stepSize * fDerivative(x_old);
 * }
 *
 * console.log('Local minimum occurs at', x_new);
 */
var epsilon = 0.0001;

module.exports = epsilon;

},{}],20:[function(require,module,exports){
'use strict';
/* @flow */

var max = require('./max'),
    min = require('./min');

/**
 * Given an array of data, this will find the extent of the
 * data and return an array of breaks that can be used
 * to categorize the data into a number of classes. The
 * returned array will always be 1 longer than the number of
 * classes because it includes the minimum value.
 *
 * @param {Array<number>} data input data, as an array of number values
 * @param {number} nClasses number of desired classes
 * @returns {Array<number>} array of class break positions
 * @example
 * equalIntervalBreaks([1, 2, 3, 4, 5, 6], 4); //= [1, 2.25, 3.5, 4.75, 6]
 */
function equalIntervalBreaks(data/*: Array<number> */, nClasses/*:number*/)/*: Array<number> */ {

    if (data.length <= 1) {
        return data;
    }

    var theMin = min(data),
        theMax = max(data); 

    // the first break will always be the minimum value
    // in the dataset
    var breaks = [theMin];

    // The size of each break is the full range of the data
    // divided by the number of classes requested
    var breakSize = (theMax - theMin) / nClasses;

    // In the case of nClasses = 1, this loop won't run
    // and the returned breaks will be [min, max]
    for (var i = 1; i < nClasses; i++) {
        breaks.push(breaks[0] + breakSize * i);
    }

    // the last break will always be the
    // maximum.
    breaks.push(theMax);

    return breaks;
}

module.exports = equalIntervalBreaks;

},{"./max":29,"./min":35}],21:[function(require,module,exports){
'use strict';
/* @flow */

/**
 * **[Gaussian error function](http://en.wikipedia.org/wiki/Error_function)**
 *
 * The `errorFunction(x/(sd * Math.sqrt(2)))` is the probability that a value in a
 * normal distribution with standard deviation sd is within x of the mean.
 *
 * This function returns a numerical approximation to the exact value.
 *
 * @param {number} x input
 * @return {number} error estimation
 * @example
 * errorFunction(1).toFixed(2); // => '0.84'
 */
function errorFunction(x/*: number */)/*: number */ {
    var t = 1 / (1 + 0.5 * Math.abs(x));
    var tau = t * Math.exp(-Math.pow(x, 2) -
        1.26551223 +
        1.00002368 * t +
        0.37409196 * Math.pow(t, 2) +
        0.09678418 * Math.pow(t, 3) -
        0.18628806 * Math.pow(t, 4) +
        0.27886807 * Math.pow(t, 5) -
        1.13520398 * Math.pow(t, 6) +
        1.48851587 * Math.pow(t, 7) -
        0.82215223 * Math.pow(t, 8) +
        0.17087277 * Math.pow(t, 9));
    if (x >= 0) {
        return 1 - tau;
    } else {
        return tau - 1;
    }
}

module.exports = errorFunction;

},{}],22:[function(require,module,exports){
'use strict';
/* @flow */

/**
 * A [Factorial](https://en.wikipedia.org/wiki/Factorial), usually written n!, is the product of all positive
 * integers less than or equal to n. Often factorial is implemented
 * recursively, but this iterative approach is significantly faster
 * and simpler.
 *
 * @param {number} n input
 * @returns {number} factorial: n!
 * @example
 * factorial(5); // => 120
 */
function factorial(n /*: number */)/*: number */ {

    // factorial is mathematically undefined for negative numbers
    if (n < 0) { return NaN; }

    // typically you'll expand the factorial function going down, like
    // 5! = 5 * 4 * 3 * 2 * 1. This is going in the opposite direction,
    // counting from 2 up to the number in question, and since anything
    // multiplied by 1 is itself, the loop only needs to start at 2.
    var accumulator = 1;
    for (var i = 2; i <= n; i++) {
        // for each number up to and including the number `n`, multiply
        // the accumulator my that number.
        accumulator *= i;
    }
    return accumulator;
}

module.exports = factorial;

},{}],23:[function(require,module,exports){
'use strict';
/* @flow */

/**
 * The [Geometric Mean](https://en.wikipedia.org/wiki/Geometric_mean) is
 * a mean function that is more useful for numbers in different
 * ranges.
 *
 * This is the nth root of the input numbers multiplied by each other.
 *
 * The geometric mean is often useful for
 * **[proportional growth](https://en.wikipedia.org/wiki/Geometric_mean#Proportional_growth)**: given
 * growth rates for multiple years, like _80%, 16.66% and 42.85%_, a simple
 * mean will incorrectly estimate an average growth rate, whereas a geometric
 * mean will correctly estimate a growth rate that, over those years,
 * will yield the same end value.
 *
 * This runs on `O(n)`, linear time in respect to the array
 *
 * @param {Array<number>} x input array
 * @returns {number} geometric mean
 * @example
 * var growthRates = [1.80, 1.166666, 1.428571];
 * var averageGrowth = geometricMean(growthRates);
 * var averageGrowthRates = [averageGrowth, averageGrowth, averageGrowth];
 * var startingValue = 10;
 * var startingValueMean = 10;
 * growthRates.forEach(function(rate) {
 *   startingValue *= rate;
 * });
 * averageGrowthRates.forEach(function(rate) {
 *   startingValueMean *= rate;
 * });
 * startingValueMean === startingValue;
 */
function geometricMean(x /*: Array<number> */) {
    // The mean of no numbers is null
    if (x.length === 0) { return undefined; }

    // the starting value.
    var value = 1;

    for (var i = 0; i < x.length; i++) {
        // the geometric mean is only valid for positive numbers
        if (x[i] <= 0) { return undefined; }

        // repeatedly multiply the value by each number
        value *= x[i];
    }

    return Math.pow(value, 1 / x.length);
}

module.exports = geometricMean;

},{}],24:[function(require,module,exports){
'use strict';
/* @flow */

/**
 * The [Harmonic Mean](https://en.wikipedia.org/wiki/Harmonic_mean) is
 * a mean function typically used to find the average of rates.
 * This mean is calculated by taking the reciprocal of the arithmetic mean
 * of the reciprocals of the input numbers.
 *
 * This is a [measure of central tendency](https://en.wikipedia.org/wiki/Central_tendency):
 * a method of finding a typical or central value of a set of numbers.
 *
 * This runs on `O(n)`, linear time in respect to the array.
 *
 * @param {Array<number>} x input
 * @returns {number} harmonic mean
 * @example
 * harmonicMean([2, 3]).toFixed(2) // => '2.40'
 */
function harmonicMean(x /*: Array<number> */) {
    // The mean of no numbers is null
    if (x.length === 0) { return undefined; }

    var reciprocalSum = 0;

    for (var i = 0; i < x.length; i++) {
        // the harmonic mean is only valid for positive numbers
        if (x[i] <= 0) { return undefined; }

        reciprocalSum += 1 / x[i];
    }

    // divide n by the the reciprocal sum
    return x.length / reciprocalSum;
}

module.exports = harmonicMean;

},{}],25:[function(require,module,exports){
'use strict';
/* @flow */

var quantile = require('./quantile');

/**
 * The [Interquartile range](http://en.wikipedia.org/wiki/Interquartile_range) is
 * a measure of statistical dispersion, or how scattered, spread, or
 * concentrated a distribution is. It's computed as the difference between
 * the third quartile and first quartile.
 *
 * @param {Array<number>} sample
 * @returns {number} interquartile range: the span between lower and upper quartile,
 * 0.25 and 0.75
 * @example
 * interquartileRange([0, 1, 2, 3]); // => 2
 */
function interquartileRange(sample/*: Array<number> */) {
    // Interquartile range is the span between the upper quartile,
    // at `0.75`, and lower quartile, `0.25`
    var q1 = quantile(sample, 0.75),
        q2 = quantile(sample, 0.25);

    if (typeof q1 === 'number' && typeof q2 === 'number') {
        return q1 - q2;
    }
}

module.exports = interquartileRange;

},{"./quantile":47}],26:[function(require,module,exports){
'use strict';
/* @flow */

/**
 * The Inverse [Gaussian error function](http://en.wikipedia.org/wiki/Error_function)
 * returns a numerical approximation to the value that would have caused
 * `errorFunction()` to return x.
 *
 * @param {number} x value of error function
 * @returns {number} estimated inverted value
 */
function inverseErrorFunction(x/*: number */)/*: number */ {
    var a = (8 * (Math.PI - 3)) / (3 * Math.PI * (4 - Math.PI));

    var inv = Math.sqrt(Math.sqrt(
        Math.pow(2 / (Math.PI * a) + Math.log(1 - x * x) / 2, 2) -
        Math.log(1 - x * x) / a) -
        (2 / (Math.PI * a) + Math.log(1 - x * x) / 2));

    if (x >= 0) {
        return inv;
    } else {
        return -inv;
    }
}

module.exports = inverseErrorFunction;

},{}],27:[function(require,module,exports){
'use strict';
/* @flow */

/**
 * [Simple linear regression](http://en.wikipedia.org/wiki/Simple_linear_regression)
 * is a simple way to find a fitted line
 * between a set of coordinates. This algorithm finds the slope and y-intercept of a regression line
 * using the least sum of squares.
 *
 * @param {Array<Array<number>>} data an array of two-element of arrays,
 * like `[[0, 1], [2, 3]]`
 * @returns {Object} object containing slope and intersect of regression line
 * @example
 * linearRegression([[0, 0], [1, 1]]); // => { m: 1, b: 0 }
 */
function linearRegression(data/*: Array<Array<number>> */)/*: { m: number, b: number } */ {

    var m, b;

    // Store data length in a local variable to reduce
    // repeated object property lookups
    var dataLength = data.length;

    //if there's only one point, arbitrarily choose a slope of 0
    //and a y-intercept of whatever the y of the initial point is
    if (dataLength === 1) {
        m = 0;
        b = data[0][1];
    } else {
        // Initialize our sums and scope the `m` and `b`
        // variables that define the line.
        var sumX = 0, sumY = 0,
            sumXX = 0, sumXY = 0;

        // Use local variables to grab point values
        // with minimal object property lookups
        var point, x, y;

        // Gather the sum of all x values, the sum of all
        // y values, and the sum of x^2 and (x*y) for each
        // value.
        //
        // In math notation, these would be SS_x, SS_y, SS_xx, and SS_xy
        for (var i = 0; i < dataLength; i++) {
            point = data[i];
            x = point[0];
            y = point[1];

            sumX += x;
            sumY += y;

            sumXX += x * x;
            sumXY += x * y;
        }

        // `m` is the slope of the regression line
        m = ((dataLength * sumXY) - (sumX * sumY)) /
            ((dataLength * sumXX) - (sumX * sumX));

        // `b` is the y-intercept of the line.
        b = (sumY / dataLength) - ((m * sumX) / dataLength);
    }

    // Return both values as an object.
    return {
        m: m,
        b: b
    };
}


module.exports = linearRegression;

},{}],28:[function(require,module,exports){
'use strict';
/* @flow */

/**
 * Given the output of `linearRegression`: an object
 * with `m` and `b` values indicating slope and intercept,
 * respectively, generate a line function that translates
 * x values into y values.
 *
 * @param {Object} mb object with `m` and `b` members, representing
 * slope and intersect of desired line
 * @returns {Function} method that computes y-value at any given
 * x-value on the line.
 * @example
 * var l = linearRegressionLine(linearRegression([[0, 0], [1, 1]]));
 * l(0) // = 0
 * l(2) // = 2
 * linearRegressionLine({ b: 0, m: 1 })(1); // => 1
 * linearRegressionLine({ b: 1, m: 1 })(1); // => 2
 */
function linearRegressionLine(mb/*: { b: number, m: number }*/)/*: Function */ {
    // Return a function that computes a `y` value for each
    // x value it is given, based on the values of `b` and `a`
    // that we just computed.
    return function(x) {
        return mb.b + (mb.m * x);
    };
}

module.exports = linearRegressionLine;

},{}],29:[function(require,module,exports){
'use strict';
/* @flow */

/**
 * This computes the maximum number in an array.
 *
 * This runs on `O(n)`, linear time in respect to the array
 *
 * @param {Array<number>} x input
 * @returns {number} maximum value
 * @example
 * max([1, 2, 3, 4]);
 * // => 4
 */
function max(x /*: Array<number> */) /*:number*/ {
    var value;
    for (var i = 0; i < x.length; i++) {
        // On the first iteration of this loop, max is
        // undefined and is thus made the maximum element in the array
        if (value === undefined || x[i] > value) {
            value = x[i];
        }
    }
    if (value === undefined) {
        return NaN;
    }
    return value;
}

module.exports = max;

},{}],30:[function(require,module,exports){
'use strict';
/* @flow */

/**
 * The maximum is the highest number in the array. With a sorted array,
 * the last element in the array is always the largest, so this calculation
 * can be done in one step, or constant time.
 *
 * @param {Array<number>} x input
 * @returns {number} maximum value
 * @example
 * maxSorted([-100, -10, 1, 2, 5]); // => 5
 */
function maxSorted(x /*: Array<number> */)/*:number*/ {
    return x[x.length - 1];
}

module.exports = maxSorted;

},{}],31:[function(require,module,exports){
'use strict';
/* @flow */

var sum = require('./sum');

/**
 * The mean, _also known as average_,
 * is the sum of all values over the number of values.
 * This is a [measure of central tendency](https://en.wikipedia.org/wiki/Central_tendency):
 * a method of finding a typical or central value of a set of numbers.
 *
 * This runs on `O(n)`, linear time in respect to the array
 *
 * @param {Array<number>} x input values
 * @returns {number} mean
 * @example
 * mean([0, 10]); // => 5
 */
function mean(x /*: Array<number> */)/*:number*/ {
    // The mean of no numbers is null
    if (x.length === 0) { return NaN; }

    return sum(x) / x.length;
}

module.exports = mean;

},{"./sum":64}],32:[function(require,module,exports){
'use strict';
/* @flow */

var quantile = require('./quantile');

/**
 * The [median](http://en.wikipedia.org/wiki/Median) is
 * the middle number of a list. This is often a good indicator of 'the middle'
 * when there are outliers that skew the `mean()` value.
 * This is a [measure of central tendency](https://en.wikipedia.org/wiki/Central_tendency):
 * a method of finding a typical or central value of a set of numbers.
 *
 * The median isn't necessarily one of the elements in the list: the value
 * can be the average of two elements if the list has an even length
 * and the two central values are different.
 *
 * @param {Array<number>} x input
 * @returns {number} median value
 * @example
 * median([10, 2, 5, 100, 2, 1]); // => 3.5
 */
function median(x /*: Array<number> */)/*:number*/ {
    return +quantile(x, 0.5);
}

module.exports = median;

},{"./quantile":47}],33:[function(require,module,exports){
'use strict';
/* @flow */

var median = require('./median');

/**
 * The [Median Absolute Deviation](http://en.wikipedia.org/wiki/Median_absolute_deviation) is
 * a robust measure of statistical
 * dispersion. It is more resilient to outliers than the standard deviation.
 *
 * @param {Array<number>} x input array
 * @returns {number} median absolute deviation
 * @example
 * medianAbsoluteDeviation([1, 1, 2, 2, 4, 6, 9]); // => 1
 */
function medianAbsoluteDeviation(x /*: Array<number> */) {
    // The mad of nothing is null
    var medianValue = median(x),
        medianAbsoluteDeviations = [];

    // Make a list of absolute deviations from the median
    for (var i = 0; i < x.length; i++) {
        medianAbsoluteDeviations.push(Math.abs(x[i] - medianValue));
    }

    // Find the median value of that list
    return median(medianAbsoluteDeviations);
}

module.exports = medianAbsoluteDeviation;

},{"./median":32}],34:[function(require,module,exports){
'use strict';
/* @flow */

var quantileSorted = require('./quantile_sorted');

/**
 * The [median](http://en.wikipedia.org/wiki/Median) is
 * the middle number of a list. This is often a good indicator of 'the middle'
 * when there are outliers that skew the `mean()` value.
 * This is a [measure of central tendency](https://en.wikipedia.org/wiki/Central_tendency):
 * a method of finding a typical or central value of a set of numbers.
 *
 * The median isn't necessarily one of the elements in the list: the value
 * can be the average of two elements if the list has an even length
 * and the two central values are different.
 *
 * @param {Array<number>} sorted input
 * @returns {number} median value
 * @example
 * medianSorted([10, 2, 5, 100, 2, 1]); // => 52.5
 */
function medianSorted(sorted /*: Array<number> */)/*:number*/ {
    return quantileSorted(sorted, 0.5);
}

module.exports = medianSorted;

},{"./quantile_sorted":48}],35:[function(require,module,exports){
'use strict';
/* @flow */

/**
 * The min is the lowest number in the array. This runs on `O(n)`, linear time in respect to the array
 *
 * @param {Array<number>} x input
 * @returns {number} minimum value
 * @example
 * min([1, 5, -10, 100, 2]); // => -10
 */
function min(x /*: Array<number> */)/*:number*/ {
    var value;
    for (var i = 0; i < x.length; i++) {
        // On the first iteration of this loop, min is
        // undefined and is thus made the minimum element in the array
        if (value === undefined || x[i] < value) {
            value = x[i];
        }
    }
    if (value === undefined) {
        return NaN;
    }
    return value;
}

module.exports = min;

},{}],36:[function(require,module,exports){
'use strict';
/* @flow */

/**
 * The minimum is the lowest number in the array. With a sorted array,
 * the first element in the array is always the smallest, so this calculation
 * can be done in one step, or constant time.
 *
 * @param {Array<number>} x input
 * @returns {number} minimum value
 * @example
 * minSorted([-100, -10, 1, 2, 5]); // => -100
 */
function minSorted(x /*: Array<number> */)/*:number*/ {
    return x[0];
}

module.exports = minSorted;

},{}],37:[function(require,module,exports){
'use strict';
/* @flow */

/**
 * **Mixin** simple_statistics to a single Array instance if provided
 * or the Array native object if not. This is an optional
 * feature that lets you treat simple_statistics as a native feature
 * of Javascript.
 *
 * @param {Object} ss simple statistics
 * @param {Array} [array=] a single array instance which will be augmented
 * with the extra methods. If omitted, mixin will apply to all arrays
 * by changing the global `Array.prototype`.
 * @returns {*} the extended Array, or Array.prototype if no object
 * is given.
 *
 * @example
 * var myNumbers = [1, 2, 3];
 * mixin(ss, myNumbers);
 * console.log(myNumbers.sum()); // 6
 */
function mixin(ss /*: Object */, array /*: ?Array<any> */)/*: any */ {
    var support = !!(Object.defineProperty && Object.defineProperties);
    // Coverage testing will never test this error.
    /* istanbul ignore next */
    if (!support) {
        throw new Error('without defineProperty, simple-statistics cannot be mixed in');
    }

    // only methods which work on basic arrays in a single step
    // are supported
    var arrayMethods = ['median', 'standardDeviation', 'sum', 'product',
        'sampleSkewness',
        'mean', 'min', 'max', 'quantile', 'geometricMean',
        'harmonicMean', 'root_mean_square'];

    // create a closure with a method name so that a reference
    // like `arrayMethods[i]` doesn't follow the loop increment
    function wrap(method) {
        return function() {
            // cast any arguments into an array, since they're
            // natively objects
            var args = Array.prototype.slice.apply(arguments);
            // make the first argument the array itself
            args.unshift(this);
            // return the result of the ss method
            return ss[method].apply(ss, args);
        };
    }

    // select object to extend
    var extending;
    if (array) {
        // create a shallow copy of the array so that our internal
        // operations do not change it by reference
        extending = array.slice();
    } else {
        extending = Array.prototype;
    }

    // for each array function, define a function that gets
    // the array as the first argument.
    // We use [defineProperty](https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Object/defineProperty)
    // because it allows these properties to be non-enumerable:
    // `for (var in x)` loops will not run into problems with this
    // implementation.
    for (var i = 0; i < arrayMethods.length; i++) {
        Object.defineProperty(extending, arrayMethods[i], {
            value: wrap(arrayMethods[i]),
            configurable: true,
            enumerable: false,
            writable: true
        });
    }

    return extending;
}

module.exports = mixin;

},{}],38:[function(require,module,exports){
'use strict';
/* @flow */

var numericSort = require('./numeric_sort'),
    modeSorted = require('./mode_sorted');

/**
 * The [mode](http://bit.ly/W5K4Yt) is the number that appears in a list the highest number of times.
 * There can be multiple modes in a list: in the event of a tie, this
 * algorithm will return the most recently seen mode.
 *
 * This is a [measure of central tendency](https://en.wikipedia.org/wiki/Central_tendency):
 * a method of finding a typical or central value of a set of numbers.
 *
 * This runs on `O(nlog(n))` because it needs to sort the array internally
 * before running an `O(n)` search to find the mode.
 *
 * @param {Array<number>} x input
 * @returns {number} mode
 * @example
 * mode([0, 0, 1]); // => 0
 */
function mode(x /*: Array<number> */)/*:number*/ {
    // Sorting the array lets us iterate through it below and be sure
    // that every time we see a new number it's new and we'll never
    // see the same number twice
    return modeSorted(numericSort(x));
}

module.exports = mode;

},{"./mode_sorted":40,"./numeric_sort":41}],39:[function(require,module,exports){
'use strict';
/* @flow */
/* globals Map: false */

/**
 * The [mode](http://bit.ly/W5K4Yt) is the number that appears in a list the highest number of times.
 * There can be multiple modes in a list: in the event of a tie, this
 * algorithm will return the most recently seen mode.
 *
 * modeFast uses a Map object to keep track of the mode, instead of the approach
 * used with `mode`, a sorted array. As a result, it is faster
 * than `mode` and supports any data type that can be compared with `==`.
 * It also requires a
 * [JavaScript environment with support for Map](https://kangax.github.io/compat-table/es6/#test-Map),
 * and will throw an error if Map is not available.
 *
 * This is a [measure of central tendency](https://en.wikipedia.org/wiki/Central_tendency):
 * a method of finding a typical or central value of a set of numbers.
 *
 * @param {Array<*>} x input
 * @returns {?*} mode
 * @throws {ReferenceError} if the JavaScript environment doesn't support Map
 * @example
 * modeFast(['rabbits', 'rabbits', 'squirrels']); // => 'rabbits'
 */
function modeFast/*::<T>*/(x /*: Array<T> */)/*: ?T */ {

    // This index will reflect the incidence of different values, indexing
    // them like
    // { value: count }
    var index = new Map();

    // A running `mode` and the number of times it has been encountered.
    var mode;
    var modeCount = 0;

    for (var i = 0; i < x.length; i++) {
        var newCount = index.get(x[i]);
        if (newCount === undefined) {
            newCount = 1;
        } else {
            newCount++;
        }
        if (newCount > modeCount) {
            mode = x[i];
            modeCount = newCount;
        }
        index.set(x[i], newCount);
    }

    return mode;
}

module.exports = modeFast;

},{}],40:[function(require,module,exports){
'use strict';
/* @flow */

/**
 * The [mode](http://bit.ly/W5K4Yt) is the number that appears in a list the highest number of times.
 * There can be multiple modes in a list: in the event of a tie, this
 * algorithm will return the most recently seen mode.
 *
 * This is a [measure of central tendency](https://en.wikipedia.org/wiki/Central_tendency):
 * a method of finding a typical or central value of a set of numbers.
 *
 * This runs in `O(n)` because the input is sorted.
 *
 * @param {Array<number>} sorted input
 * @returns {number} mode
 * @example
 * modeSorted([0, 0, 1]); // => 0
 */
function modeSorted(sorted /*: Array<number> */)/*:number*/ {

    // Handle edge cases:
    // The mode of an empty list is NaN
    if (sorted.length === 0) { return NaN; }
    else if (sorted.length === 1) { return sorted[0]; }

    // This assumes it is dealing with an array of size > 1, since size
    // 0 and 1 are handled immediately. Hence it starts at index 1 in the
    // array.
    var last = sorted[0],
        // store the mode as we find new modes
        value = NaN,
        // store how many times we've seen the mode
        maxSeen = 0,
        // how many times the current candidate for the mode
        // has been seen
        seenThis = 1;

    // end at sorted.length + 1 to fix the case in which the mode is
    // the highest number that occurs in the sequence. the last iteration
    // compares sorted[i], which is undefined, to the highest number
    // in the series
    for (var i = 1; i < sorted.length + 1; i++) {
        // we're seeing a new number pass by
        if (sorted[i] !== last) {
            // the last number is the new mode since we saw it more
            // often than the old one
            if (seenThis > maxSeen) {
                maxSeen = seenThis;
                value = last;
            }
            seenThis = 1;
            last = sorted[i];
        // if this isn't a new number, it's one more occurrence of
        // the potential mode
        } else { seenThis++; }
    }
    return value;
}

module.exports = modeSorted;

},{}],41:[function(require,module,exports){
'use strict';
/* @flow */

/**
 * Sort an array of numbers by their numeric value, ensuring that the
 * array is not changed in place.
 *
 * This is necessary because the default behavior of .sort
 * in JavaScript is to sort arrays as string values
 *
 *     [1, 10, 12, 102, 20].sort()
 *     // output
 *     [1, 10, 102, 12, 20]
 *
 * @param {Array<number>} array input array
 * @return {Array<number>} sorted array
 * @private
 * @example
 * numericSort([3, 2, 1]) // => [1, 2, 3]
 */
function numericSort(array /*: Array<number> */) /*: Array<number> */ {
    return array
        // ensure the array is not changed in-place
        .slice()
        // comparator function that treats input as numeric
        .sort(function(a, b) {
            return a - b;
        });
}

module.exports = numericSort;

},{}],42:[function(require,module,exports){
'use strict';
/* @flow */

/**
 * This is a single-layer [Perceptron Classifier](http://en.wikipedia.org/wiki/Perceptron) that takes
 * arrays of numbers and predicts whether they should be classified
 * as either 0 or 1 (negative or positive examples).
 * @class
 * @example
 * // Create the model
 * var p = new PerceptronModel();
 * // Train the model with input with a diagonal boundary.
 * for (var i = 0; i < 5; i++) {
 *     p.train([1, 1], 1);
 *     p.train([0, 1], 0);
 *     p.train([1, 0], 0);
 *     p.train([0, 0], 0);
 * }
 * p.predict([0, 0]); // 0
 * p.predict([0, 1]); // 0
 * p.predict([1, 0]); // 0
 * p.predict([1, 1]); // 1
 */
function PerceptronModel() {
    // The weights, or coefficients of the model;
    // weights are only populated when training with data.
    this.weights = [];
    // The bias term, or intercept; it is also a weight but
    // it's stored separately for convenience as it is always
    // multiplied by one.
    this.bias = 0;
}

/**
 * **Predict**: Use an array of features with the weight array and bias
 * to predict whether an example is labeled 0 or 1.
 *
 * @param {Array<number>} features an array of features as numbers
 * @returns {number} 1 if the score is over 0, otherwise 0
 */
PerceptronModel.prototype.predict = function(features) {

    // Only predict if previously trained
    // on the same size feature array(s).
    if (features.length !== this.weights.length) { return null; }

    // Calculate the sum of features times weights,
    // with the bias added (implicitly times one).
    var score = 0;
    for (var i = 0; i < this.weights.length; i++) {
        score += this.weights[i] * features[i];
    }
    score += this.bias;

    // Classify as 1 if the score is over 0, otherwise 0.
    if (score > 0) {
        return 1;
    } else {
        return 0;
    }
};

/**
 * **Train** the classifier with a new example, which is
 * a numeric array of features and a 0 or 1 label.
 *
 * @param {Array<number>} features an array of features as numbers
 * @param {number} label either 0 or 1
 * @returns {PerceptronModel} this
 */
PerceptronModel.prototype.train = function(features, label) {
    // Require that only labels of 0 or 1 are considered.
    if (label !== 0 && label !== 1) { return null; }
    // The length of the feature array determines
    // the length of the weight array.
    // The perceptron will continue learning as long as
    // it keeps seeing feature arrays of the same length.
    // When it sees a new data shape, it initializes.
    if (features.length !== this.weights.length) {
        this.weights = features;
        this.bias = 1;
    }
    // Make a prediction based on current weights.
    var prediction = this.predict(features);
    // Update the weights if the prediction is wrong.
    if (prediction !== label) {
        var gradient = label - prediction;
        for (var i = 0; i < this.weights.length; i++) {
            this.weights[i] += gradient * features[i];
        }
        this.bias += gradient;
    }
    return this;
};

module.exports = PerceptronModel;

},{}],43:[function(require,module,exports){
/* @flow */

'use strict';

/**
 * Implementation of [Heap's Algorithm](https://en.wikipedia.org/wiki/Heap%27s_algorithm)
 * for generating permutations.
 *
 * @param {Array} elements any type of data
 * @returns {Array<Array>} array of permutations
 */
function permutationsHeap/*:: <T> */(elements /*: Array<T> */)/*: Array<Array<T>> */ {
    var indexes = new Array(elements.length);
    var permutations = [elements.slice()];

    for (var i = 0; i < elements.length; i++) {
        indexes[i] = 0;
    }

    for (i = 0; i < elements.length;) {
        if (indexes[i] < i) {

            // At odd indexes, swap from indexes[i] instead
            // of from the beginning of the array
            var swapFrom = 0;
            if (i % 2 !== 0) {
                swapFrom = indexes[i];
            }

            // swap between swapFrom and i, using
            // a temporary variable as storage.
            var temp = elements[swapFrom];
            elements[swapFrom] = elements[i];
            elements[i] = temp;

            permutations.push(elements.slice());
            indexes[i]++;
            i = 0;

        } else {
            indexes[i] = 0;
            i++;
        }
    }

    return permutations;
}

module.exports = permutationsHeap;

},{}],44:[function(require,module,exports){
'use strict';
/* @flow */

var epsilon = require('./epsilon');
var factorial = require('./factorial');

/**
 * The [Poisson Distribution](http://en.wikipedia.org/wiki/Poisson_distribution)
 * is a discrete probability distribution that expresses the probability
 * of a given number of events occurring in a fixed interval of time
 * and/or space if these events occur with a known average rate and
 * independently of the time since the last event.
 *
 * The Poisson Distribution is characterized by the strictly positive
 * mean arrival or occurrence rate, `λ`.
 *
 * @param {number} lambda location poisson distribution
 * @returns {number} value of poisson distribution at that point
 */
function poissonDistribution(lambda/*: number */) {
    // Check that lambda is strictly positive
    if (lambda <= 0) { return undefined; }

    // our current place in the distribution
    var x = 0,
        // and we keep track of the current cumulative probability, in
        // order to know when to stop calculating chances.
        cumulativeProbability = 0,
        // the calculated cells to be returned
        cells = {};

    // This algorithm iterates through each potential outcome,
    // until the `cumulativeProbability` is very close to 1, at
    // which point we've defined the vast majority of outcomes
    do {
        // a [probability mass function](https://en.wikipedia.org/wiki/Probability_mass_function)
        cells[x] = (Math.pow(Math.E, -lambda) * Math.pow(lambda, x)) / factorial(x);
        cumulativeProbability += cells[x];
        x++;
    // when the cumulativeProbability is nearly 1, we've calculated
    // the useful range of this distribution
    } while (cumulativeProbability < 1 - epsilon);

    return cells;
}

module.exports = poissonDistribution;

},{"./epsilon":19,"./factorial":22}],45:[function(require,module,exports){
'use strict';
/* @flow */

var epsilon = require('./epsilon');
var inverseErrorFunction = require('./inverse_error_function');

/**
 * The [Probit](http://en.wikipedia.org/wiki/Probit)
 * is the inverse of cumulativeStdNormalProbability(),
 * and is also known as the normal quantile function.
 *
 * It returns the number of standard deviations from the mean
 * where the p'th quantile of values can be found in a normal distribution.
 * So, for example, probit(0.5 + 0.6827/2) ≈ 1 because 68.27% of values are
 * normally found within 1 standard deviation above or below the mean.
 *
 * @param {number} p
 * @returns {number} probit
 */
function probit(p /*: number */)/*: number */ {
    if (p === 0) {
        p = epsilon;
    } else if (p >= 1) {
        p = 1 - epsilon;
    }
    return Math.sqrt(2) * inverseErrorFunction(2 * p - 1);
}

module.exports = probit;

},{"./epsilon":19,"./inverse_error_function":26}],46:[function(require,module,exports){
'use strict';
/* @flow */

/**
 * The [product](https://en.wikipedia.org/wiki/Product_(mathematics)) of an array
 * is the result of multiplying all numbers together, starting using one as the multiplicative identity.
 *
 * This runs on `O(n)`, linear time in respect to the array
 *
 * @param {Array<number>} x input
 * @return {number} product of all input numbers
 * @example
 * product([1, 2, 3, 4]); // => 24
 */
function product(x/*: Array<number> */)/*: number */ {
    var value = 1;
    for (var i = 0; i < x.length; i++) {
        value *= x[i];
    }
    return value;
}

module.exports = product;

},{}],47:[function(require,module,exports){
'use strict';
/* @flow */

var quantileSorted = require('./quantile_sorted');
var quickselect = require('./quickselect');

/**
 * The [quantile](https://en.wikipedia.org/wiki/Quantile):
 * this is a population quantile, since we assume to know the entire
 * dataset in this library. This is an implementation of the
 * [Quantiles of a Population](http://en.wikipedia.org/wiki/Quantile#Quantiles_of_a_population)
 * algorithm from wikipedia.
 *
 * Sample is a one-dimensional array of numbers,
 * and p is either a decimal number from 0 to 1 or an array of decimal
 * numbers from 0 to 1.
 * In terms of a k/q quantile, p = k/q - it's just dealing with fractions or dealing
 * with decimal values.
 * When p is an array, the result of the function is also an array containing the appropriate
 * quantiles in input order
 *
 * @param {Array<number>} sample a sample from the population
 * @param {number} p the desired quantile, as a number between 0 and 1
 * @returns {number} quantile
 * @example
 * quantile([3, 6, 7, 8, 8, 9, 10, 13, 15, 16, 20], 0.5); // => 9
 */
function quantile(sample /*: Array<number> */, p /*: Array<number> | number */) {
    var copy = sample.slice();

    if (Array.isArray(p)) {
        // rearrange elements so that each element corresponding to a requested
        // quantile is on a place it would be if the array was fully sorted
        multiQuantileSelect(copy, p);
        // Initialize the result array
        var results = [];
        // For each requested quantile
        for (var i = 0; i < p.length; i++) {
            results[i] = quantileSorted(copy, p[i]);
        }
        return results;
    } else {
        var idx = quantileIndex(copy.length, p);
        quantileSelect(copy, idx, 0, copy.length - 1);
        return quantileSorted(copy, p);
    }
}

function quantileSelect(arr, k, left, right) {
    if (k % 1 === 0) {
        quickselect(arr, k, left, right);
    } else {
        k = Math.floor(k);
        quickselect(arr, k, left, right);
        quickselect(arr, k + 1, k + 1, right);
    }
}

function multiQuantileSelect(arr, p) {
    var indices = [0];
    for (var i = 0; i < p.length; i++) {
        indices.push(quantileIndex(arr.length, p[i]));
    }
    indices.push(arr.length - 1);
    indices.sort(compare);

    var stack = [0, indices.length - 1];

    while (stack.length) {
        var r = Math.ceil(stack.pop());
        var l = Math.floor(stack.pop());
        if (r - l <= 1) continue;

        var m = Math.floor((l + r) / 2);
        quantileSelect(arr, indices[m], indices[l], indices[r]);

        stack.push(l, m, m, r);
    }
}

function compare(a, b) {
    return a - b;
}

function quantileIndex(len /*: number */, p /*: number */)/*:number*/ {
    var idx = len * p;
    if (p === 1) {
        // If p is 1, directly return the last index
        return len - 1;
    } else if (p === 0) {
        // If p is 0, directly return the first index
        return 0;
    } else if (idx % 1 !== 0) {
        // If index is not integer, return the next index in array
        return Math.ceil(idx) - 1;
    } else if (len % 2 === 0) {
        // If the list has even-length, we'll return the middle of two indices
        // around quantile to indicate that we need an average value of the two
        return idx - 0.5;
    } else {
        // Finally, in the simple case of an integer index
        // with an odd-length list, return the index
        return idx;
    }
}

module.exports = quantile;

},{"./quantile_sorted":48,"./quickselect":49}],48:[function(require,module,exports){
'use strict';
/* @flow */

/**
 * This is the internal implementation of quantiles: when you know
 * that the order is sorted, you don't need to re-sort it, and the computations
 * are faster.
 *
 * @param {Array<number>} sample input data
 * @param {number} p desired quantile: a number between 0 to 1, inclusive
 * @returns {number} quantile value
 * @example
 * quantileSorted([3, 6, 7, 8, 8, 9, 10, 13, 15, 16, 20], 0.5); // => 9
 */
function quantileSorted(sample /*: Array<number> */, p /*: number */)/*:number*/ {
    var idx = sample.length * p;
    if (p < 0 || p > 1) {
        return NaN;
    } else if (p === 1) {
        // If p is 1, directly return the last element
        return sample[sample.length - 1];
    } else if (p === 0) {
        // If p is 0, directly return the first element
        return sample[0];
    } else if (idx % 1 !== 0) {
        // If p is not integer, return the next element in array
        return sample[Math.ceil(idx) - 1];
    } else if (sample.length % 2 === 0) {
        // If the list has even-length, we'll take the average of this number
        // and the next value, if there is one
        return (sample[idx - 1] + sample[idx]) / 2;
    } else {
        // Finally, in the simple case of an integer value
        // with an odd-length list, return the sample value at the index.
        return sample[idx];
    }
}

module.exports = quantileSorted;

},{}],49:[function(require,module,exports){
'use strict';
/* @flow */

module.exports = quickselect;

/**
 * Rearrange items in `arr` so that all items in `[left, k]` range are the smallest.
 * The `k`-th element will have the `(k - left + 1)`-th smallest value in `[left, right]`.
 *
 * Implements Floyd-Rivest selection algorithm https://en.wikipedia.org/wiki/Floyd-Rivest_algorithm
 *
 * @private
 * @param {Array<number>} arr input array
 * @param {number} k pivot index
 * @param {number} left left index
 * @param {number} right right index
 * @returns {undefined}
 * @example
 * var arr = [65, 28, 59, 33, 21, 56, 22, 95, 50, 12, 90, 53, 28, 77, 39];
 * quickselect(arr, 8);
 * // = [39, 28, 28, 33, 21, 12, 22, 50, 53, 56, 59, 65, 90, 77, 95]
 */
function quickselect(arr /*: Array<number> */, k /*: number */, left /*: number */, right /*: number */) {
    left = left || 0;
    right = right || (arr.length - 1);

    while (right > left) {
        // 600 and 0.5 are arbitrary constants chosen in the original paper to minimize execution time
        if (right - left > 600) {
            var n = right - left + 1;
            var m = k - left + 1;
            var z = Math.log(n);
            var s = 0.5 * Math.exp(2 * z / 3);
            var sd = 0.5 * Math.sqrt(z * s * (n - s) / n);
            if (m - n / 2 < 0) sd *= -1;
            var newLeft = Math.max(left, Math.floor(k - m * s / n + sd));
            var newRight = Math.min(right, Math.floor(k + (n - m) * s / n + sd));
            quickselect(arr, k, newLeft, newRight);
        }

        var t = arr[k];
        var i = left;
        var j = right;

        swap(arr, left, k);
        if (arr[right] > t) swap(arr, left, right);

        while (i < j) {
            swap(arr, i, j);
            i++;
            j--;
            while (arr[i] < t) i++;
            while (arr[j] > t) j--;
        }

        if (arr[left] === t) swap(arr, left, j);
        else {
            j++;
            swap(arr, j, right);
        }

        if (j <= k) left = j + 1;
        if (k <= j) right = j - 1;
    }
}

function swap(arr, i, j) {
    var tmp = arr[i];
    arr[i] = arr[j];
    arr[j] = tmp;
}

},{}],50:[function(require,module,exports){
'use strict';
/* @flow */

/**
 * The [R Squared](http://en.wikipedia.org/wiki/Coefficient_of_determination)
 * value of data compared with a function `f`
 * is the sum of the squared differences between the prediction
 * and the actual value.
 *
 * @param {Array<Array<number>>} data input data: this should be doubly-nested
 * @param {Function} func function called on `[i][0]` values within the dataset
 * @returns {number} r-squared value
 * @example
 * var samples = [[0, 0], [1, 1]];
 * var regressionLine = linearRegressionLine(linearRegression(samples));
 * rSquared(samples, regressionLine); // = 1 this line is a perfect fit
 */
function rSquared(data /*: Array<Array<number>> */, func /*: Function */) /*: number */ {
    if (data.length < 2) { return 1; }

    // Compute the average y value for the actual
    // data set in order to compute the
    // _total sum of squares_
    var sum = 0, average;
    for (var i = 0; i < data.length; i++) {
        sum += data[i][1];
    }
    average = sum / data.length;

    // Compute the total sum of squares - the
    // squared difference between each point
    // and the average of all points.
    var sumOfSquares = 0;
    for (var j = 0; j < data.length; j++) {
        sumOfSquares += Math.pow(average - data[j][1], 2);
    }

    // Finally estimate the error: the squared
    // difference between the estimate and the actual data
    // value at each point.
    var err = 0;
    for (var k = 0; k < data.length; k++) {
        err += Math.pow(data[k][1] - func(data[k][0]), 2);
    }

    // As the error grows larger, its ratio to the
    // sum of squares increases and the r squared
    // value grows lower.
    return 1 - err / sumOfSquares;
}

module.exports = rSquared;

},{}],51:[function(require,module,exports){
'use strict';
/* @flow */

/**
 * The Root Mean Square (RMS) is
 * a mean function used as a measure of the magnitude of a set
 * of numbers, regardless of their sign.
 * This is the square root of the mean of the squares of the
 * input numbers.
 * This runs on `O(n)`, linear time in respect to the array
 *
 * @param {Array<number>} x input
 * @returns {number} root mean square
 * @example
 * rootMeanSquare([-1, 1, -1, 1]); // => 1
 */
function rootMeanSquare(x /*: Array<number> */)/*:number*/ {
    if (x.length === 0) { return NaN; }

    var sumOfSquares = 0;
    for (var i = 0; i < x.length; i++) {
        sumOfSquares += Math.pow(x[i], 2);
    }

    return Math.sqrt(sumOfSquares / x.length);
}

module.exports = rootMeanSquare;

},{}],52:[function(require,module,exports){
'use strict';
/* @flow */

var shuffle = require('./shuffle');

/**
 * Create a [simple random sample](http://en.wikipedia.org/wiki/Simple_random_sample)
 * from a given array of `n` elements.
 *
 * The sampled values will be in any order, not necessarily the order
 * they appear in the input.
 *
 * @param {Array} array input array. can contain any type
 * @param {number} n count of how many elements to take
 * @param {Function} [randomSource=Math.random] an optional entropy source that
 * returns numbers between 0 inclusive and 1 exclusive: the range [0, 1)
 * @return {Array} subset of n elements in original array
 * @example
 * var values = [1, 2, 4, 5, 6, 7, 8, 9];
 * sample(values, 3); // returns 3 random values, like [2, 5, 8];
 */
function sample/*:: <T> */(
    array /*: Array<T> */,
    n /*: number */,
    randomSource /*: Function */) /*: Array<T> */ {
    // shuffle the original array using a fisher-yates shuffle
    var shuffled = shuffle(array, randomSource);

    // and then return a subset of it - the first `n` elements.
    return shuffled.slice(0, n);
}

module.exports = sample;

},{"./shuffle":59}],53:[function(require,module,exports){
'use strict';
/* @flow */

var sampleCovariance = require('./sample_covariance');
var sampleStandardDeviation = require('./sample_standard_deviation');

/**
 * The [correlation](http://en.wikipedia.org/wiki/Correlation_and_dependence) is
 * a measure of how correlated two datasets are, between -1 and 1
 *
 * @param {Array<number>} x first input
 * @param {Array<number>} y second input
 * @returns {number} sample correlation
 * @example
 * sampleCorrelation([1, 2, 3, 4, 5, 6], [2, 2, 3, 4, 5, 60]).toFixed(2);
 * // => '0.69'
 */
function sampleCorrelation(x/*: Array<number> */, y/*: Array<number> */)/*:number*/ {
    var cov = sampleCovariance(x, y),
        xstd = sampleStandardDeviation(x),
        ystd = sampleStandardDeviation(y);

    return cov / xstd / ystd;
}

module.exports = sampleCorrelation;

},{"./sample_covariance":54,"./sample_standard_deviation":56}],54:[function(require,module,exports){
'use strict';
/* @flow */

var mean = require('./mean');

/**
 * [Sample covariance](https://en.wikipedia.org/wiki/Sample_mean_and_sampleCovariance) of two datasets:
 * how much do the two datasets move together?
 * x and y are two datasets, represented as arrays of numbers.
 *
 * @param {Array<number>} x first input
 * @param {Array<number>} y second input
 * @returns {number} sample covariance
 * @example
 * sampleCovariance([1, 2, 3, 4, 5, 6], [6, 5, 4, 3, 2, 1]); // => -3.5
 */
function sampleCovariance(x /*:Array<number>*/, y /*:Array<number>*/)/*:number*/ {

    // The two datasets must have the same length which must be more than 1
    if (x.length <= 1 || x.length !== y.length) {
        return NaN;
    }

    // determine the mean of each dataset so that we can judge each
    // value of the dataset fairly as the difference from the mean. this
    // way, if one dataset is [1, 2, 3] and [2, 3, 4], their covariance
    // does not suffer because of the difference in absolute values
    var xmean = mean(x),
        ymean = mean(y),
        sum = 0;

    // for each pair of values, the covariance increases when their
    // difference from the mean is associated - if both are well above
    // or if both are well below
    // the mean, the covariance increases significantly.
    for (var i = 0; i < x.length; i++) {
        sum += (x[i] - xmean) * (y[i] - ymean);
    }

    // this is Bessels' Correction: an adjustment made to sample statistics
    // that allows for the reduced degree of freedom entailed in calculating
    // values from samples rather than complete populations.
    var besselsCorrection = x.length - 1;

    // the covariance is weighted by the length of the datasets.
    return sum / besselsCorrection;
}

module.exports = sampleCovariance;

},{"./mean":31}],55:[function(require,module,exports){
'use strict';
/* @flow */

var sumNthPowerDeviations = require('./sum_nth_power_deviations');
var sampleStandardDeviation = require('./sample_standard_deviation');

/**
 * [Skewness](http://en.wikipedia.org/wiki/Skewness) is
 * a measure of the extent to which a probability distribution of a
 * real-valued random variable "leans" to one side of the mean.
 * The skewness value can be positive or negative, or even undefined.
 *
 * Implementation is based on the adjusted Fisher-Pearson standardized
 * moment coefficient, which is the version found in Excel and several
 * statistical packages including Minitab, SAS and SPSS.
 *
 * @param {Array<number>} x input
 * @returns {number} sample skewness
 * @example
 * sampleSkewness([2, 4, 6, 3, 1]); // => 0.590128656384365
 */
function sampleSkewness(x /*: Array<number> */)/*:number*/ {
    // The skewness of less than three arguments is null
    var theSampleStandardDeviation = sampleStandardDeviation(x);

    if (isNaN(theSampleStandardDeviation) || x.length < 3) {
        return NaN;
    }

    var n = x.length,
        cubedS = Math.pow(theSampleStandardDeviation, 3),
        sumCubedDeviations = sumNthPowerDeviations(x, 3);

    return n * sumCubedDeviations / ((n - 1) * (n - 2) * cubedS);
}

module.exports = sampleSkewness;

},{"./sample_standard_deviation":56,"./sum_nth_power_deviations":65}],56:[function(require,module,exports){
'use strict';
/* @flow */

var sampleVariance = require('./sample_variance');

/**
 * The [standard deviation](http://en.wikipedia.org/wiki/Standard_deviation)
 * is the square root of the variance.
 *
 * @param {Array<number>} x input array
 * @returns {number} sample standard deviation
 * @example
 * sampleStandardDeviation([2, 4, 4, 4, 5, 5, 7, 9]).toFixed(2);
 * // => '2.14'
 */
function sampleStandardDeviation(x/*:Array<number>*/)/*:number*/ {
    // The standard deviation of no numbers is null
    var sampleVarianceX = sampleVariance(x);
    if (isNaN(sampleVarianceX)) { return NaN; }
    return Math.sqrt(sampleVarianceX);
}

module.exports = sampleStandardDeviation;

},{"./sample_variance":57}],57:[function(require,module,exports){
'use strict';
/* @flow */

var sumNthPowerDeviations = require('./sum_nth_power_deviations');

/**
 * The [sample variance](https://en.wikipedia.org/wiki/Variance#Sample_variance)
 * is the sum of squared deviations from the mean. The sample variance
 * is distinguished from the variance by the usage of [Bessel's Correction](https://en.wikipedia.org/wiki/Bessel's_correction):
 * instead of dividing the sum of squared deviations by the length of the input,
 * it is divided by the length minus one. This corrects the bias in estimating
 * a value from a set that you don't know if full.
 *
 * References:
 * * [Wolfram MathWorld on Sample Variance](http://mathworld.wolfram.com/SampleVariance.html)
 *
 * @param {Array<number>} x input array
 * @return {number} sample variance
 * @example
 * sampleVariance([1, 2, 3, 4, 5]); // => 2.5
 */
function sampleVariance(x /*: Array<number> */)/*:number*/ {
    // The variance of no numbers is null
    if (x.length <= 1) { return NaN; }

    var sumSquaredDeviationsValue = sumNthPowerDeviations(x, 2);

    // this is Bessels' Correction: an adjustment made to sample statistics
    // that allows for the reduced degree of freedom entailed in calculating
    // values from samples rather than complete populations.
    var besselsCorrection = x.length - 1;

    // Find the mean value of that list
    return sumSquaredDeviationsValue / besselsCorrection;
}

module.exports = sampleVariance;

},{"./sum_nth_power_deviations":65}],58:[function(require,module,exports){
'use strict';
/* @flow */

/**
 * Sampling with replacement is a type of sampling that allows the same
 * item to be picked out of a population more than once.
 *
 * @param {Array} population an array of any kind of element
 * @param {number} n count of how many elements to take
 * @param {Function} [randomSource=Math.random] an optional entropy source that
 * returns numbers between 0 inclusive and 1 exclusive: the range [0, 1)
 * @return {Array} n sampled items from the population
 * @example
 * var sample = sampleWithReplacement([1, 2, 3, 4], 2);
 * sampleWithReplacement; // = [2, 4] or any other random sample of 2 items
 */
function sampleWithReplacement/*::<T>*/(population/*:Array<T>*/,
    n /*: number */,
    randomSource/*:Function*/) {

    if (population.length === 0) {
        return [];
    }

    // a custom random number source can be provided if you want to use
    // a fixed seed or another random number generator, like
    // [random-js](https://www.npmjs.org/package/random-js)
    randomSource = randomSource || Math.random;

    var length = population.length;
    var sample = [];

    for (var i = 0; i < n; i++) {
        var index = Math.floor(randomSource() * length);

        sample.push(population[index]);
    }

    return sample;
}

module.exports = sampleWithReplacement;

},{}],59:[function(require,module,exports){
'use strict';
/* @flow */

var shuffleInPlace = require('./shuffle_in_place');

/**
 * A [Fisher-Yates shuffle](http://en.wikipedia.org/wiki/Fisher%E2%80%93Yates_shuffle)
 * is a fast way to create a random permutation of a finite set. This is
 * a function around `shuffle_in_place` that adds the guarantee that
 * it will not modify its input.
 *
 * @param {Array} sample an array of any kind of element
 * @param {Function} [randomSource=Math.random] an optional entropy source that
 * returns numbers between 0 inclusive and 1 exclusive: the range [0, 1)
 * @return {Array} shuffled version of input
 * @example
 * var shuffled = shuffle([1, 2, 3, 4]);
 * shuffled; // = [2, 3, 1, 4] or any other random permutation
 */
function shuffle/*::<T>*/(sample/*:Array<T>*/, randomSource/*:Function*/) {
    // slice the original array so that it is not modified
    sample = sample.slice();

    // and then shuffle that shallow-copied array, in place
    return shuffleInPlace(sample.slice(), randomSource);
}

module.exports = shuffle;

},{"./shuffle_in_place":60}],60:[function(require,module,exports){
'use strict';
/* @flow */

/**
 * A [Fisher-Yates shuffle](http://en.wikipedia.org/wiki/Fisher%E2%80%93Yates_shuffle)
 * in-place - which means that it **will change the order of the original
 * array by reference**.
 *
 * This is an algorithm that generates a random [permutation](https://en.wikipedia.org/wiki/Permutation)
 * of a set.
 *
 * @param {Array} sample input array
 * @param {Function} [randomSource=Math.random] an optional entropy source that
 * returns numbers between 0 inclusive and 1 exclusive: the range [0, 1)
 * @returns {Array} sample
 * @example
 * var sample = [1, 2, 3, 4];
 * shuffleInPlace(sample);
 * // sample is shuffled to a value like [2, 1, 4, 3]
 */
function shuffleInPlace(sample/*:Array<any>*/, randomSource/*:Function*/)/*:Array<any>*/ {


    // a custom random number source can be provided if you want to use
    // a fixed seed or another random number generator, like
    // [random-js](https://www.npmjs.org/package/random-js)
    randomSource = randomSource || Math.random;

    // store the current length of the sample to determine
    // when no elements remain to shuffle.
    var length = sample.length;

    // temporary is used to hold an item when it is being
    // swapped between indices.
    var temporary;

    // The index to swap at each stage.
    var index;

    // While there are still items to shuffle
    while (length > 0) {
        // chose a random index within the subset of the array
        // that is not yet shuffled
        index = Math.floor(randomSource() * length--);

        // store the value that we'll move temporarily
        temporary = sample[length];

        // swap the value at `sample[length]` with `sample[index]`
        sample[length] = sample[index];
        sample[index] = temporary;
    }

    return sample;
}

module.exports = shuffleInPlace;

},{}],61:[function(require,module,exports){
'use strict';
/* @flow */

/**
 * [Sign](https://en.wikipedia.org/wiki/Sign_function) is a function 
 * that extracts the sign of a real number
 * 
 * @param {Number} x input value
 * @returns {Number} sign value either 1, 0 or -1
 * @throws {TypeError} if the input argument x is not a number
 * @private
 * 
 * @example
 * sign(2); // => 1
 */
function sign(x/*: number */)/*: number */ {
    if (typeof x === 'number') {
        if (x < 0) {
            return -1;
        } else if (x === 0) {
            return 0
        } else {
            return 1;
        }
    } else {
        throw new TypeError('not a number');
    }
}

module.exports = sign;

},{}],62:[function(require,module,exports){
'use strict';
/* @flow */

var variance = require('./variance');

/**
 * The [standard deviation](http://en.wikipedia.org/wiki/Standard_deviation)
 * is the square root of the variance. It's useful for measuring the amount
 * of variation or dispersion in a set of values.
 *
 * Standard deviation is only appropriate for full-population knowledge: for
 * samples of a population, {@link sampleStandardDeviation} is
 * more appropriate.
 *
 * @param {Array<number>} x input
 * @returns {number} standard deviation
 * @example
 * variance([2, 4, 4, 4, 5, 5, 7, 9]); // => 4
 * standardDeviation([2, 4, 4, 4, 5, 5, 7, 9]); // => 2
 */
function standardDeviation(x /*: Array<number> */)/*:number*/ {
    // The standard deviation of no numbers is null
    var v = variance(x);
    if (isNaN(v)) { return 0; }
    return Math.sqrt(v);
}

module.exports = standardDeviation;

},{"./variance":70}],63:[function(require,module,exports){
'use strict';
/* @flow */

var SQRT_2PI = Math.sqrt(2 * Math.PI);

function cumulativeDistribution(z) {
    var sum = z,
        tmp = z;

    // 15 iterations are enough for 4-digit precision
    for (var i = 1; i < 15; i++) {
        tmp *= z * z / (2 * i + 1);
        sum += tmp;
    }
    return Math.round((0.5 + (sum / SQRT_2PI) * Math.exp(-z * z / 2)) * 1e4) / 1e4;
}

/**
 * A standard normal table, also called the unit normal table or Z table,
 * is a mathematical table for the values of Φ (phi), which are the values of
 * the cumulative distribution function of the normal distribution.
 * It is used to find the probability that a statistic is observed below,
 * above, or between values on the standard normal distribution, and by
 * extension, any normal distribution.
 *
 * The probabilities are calculated using the
 * [Cumulative distribution function](https://en.wikipedia.org/wiki/Normal_distribution#Cumulative_distribution_function).
 * The table used is the cumulative, and not cumulative from 0 to mean
 * (even though the latter has 5 digits precision, instead of 4).
 */
var standardNormalTable/*: Array<number> */ = [];

for (var z = 0; z <= 3.09; z += 0.01) {
    standardNormalTable.push(cumulativeDistribution(z));
}

module.exports = standardNormalTable;

},{}],64:[function(require,module,exports){
'use strict';
/* @flow */

/**
 * Our default sum is the [Kahan summation algorithm](https://en.wikipedia.org/wiki/Kahan_summation_algorithm) is
 * a method for computing the sum of a list of numbers while correcting
 * for floating-point errors. Traditionally, sums are calculated as many
 * successive additions, each one with its own floating-point roundoff. These
 * losses in precision add up as the number of numbers increases. This alternative
 * algorithm is more accurate than the simple way of calculating sums by simple
 * addition.
 *
 * This runs on `O(n)`, linear time in respect to the array
 *
 * @param {Array<number>} x input
 * @return {number} sum of all input numbers
 * @example
 * sum([1, 2, 3]); // => 6
 */
function sum(x/*: Array<number> */)/*: number */ {

    // like the traditional sum algorithm, we keep a running
    // count of the current sum.
    var sum = 0;

    // but we also keep three extra variables as bookkeeping:
    // most importantly, an error correction value. This will be a very
    // small number that is the opposite of the floating point precision loss.
    var errorCompensation = 0;

    // this will be each number in the list corrected with the compensation value.
    var correctedCurrentValue;

    // and this will be the next sum
    var nextSum;

    for (var i = 0; i < x.length; i++) {
        // first correct the value that we're going to add to the sum
        correctedCurrentValue = x[i] - errorCompensation;

        // compute the next sum. sum is likely a much larger number
        // than correctedCurrentValue, so we'll lose precision here,
        // and measure how much precision is lost in the next step
        nextSum = sum + correctedCurrentValue;

        // we intentionally didn't assign sum immediately, but stored
        // it for now so we can figure out this: is (sum + nextValue) - nextValue
        // not equal to 0? ideally it would be, but in practice it won't:
        // it will be some very small number. that's what we record
        // as errorCompensation.
        errorCompensation = nextSum - sum - correctedCurrentValue;

        // now that we've computed how much we'll correct for in the next
        // loop, start treating the nextSum as the current sum.
        sum = nextSum;
    }

    return sum;
}

module.exports = sum;

},{}],65:[function(require,module,exports){
'use strict';
/* @flow */

var mean = require('./mean');

/**
 * The sum of deviations to the Nth power.
 * When n=2 it's the sum of squared deviations.
 * When n=3 it's the sum of cubed deviations.
 *
 * @param {Array<number>} x
 * @param {number} n power
 * @returns {number} sum of nth power deviations
 * @example
 * var input = [1, 2, 3];
 * // since the variance of a set is the mean squared
 * // deviations, we can calculate that with sumNthPowerDeviations:
 * var variance = sumNthPowerDeviations(input) / input.length;
 */
function sumNthPowerDeviations(x/*: Array<number> */, n/*: number */)/*:number*/ {
    var meanValue = mean(x),
        sum = 0;

    for (var i = 0; i < x.length; i++) {
        sum += Math.pow(x[i] - meanValue, n);
    }

    return sum;
}

module.exports = sumNthPowerDeviations;

},{"./mean":31}],66:[function(require,module,exports){
'use strict';
/* @flow */

/**
 * The simple [sum](https://en.wikipedia.org/wiki/Summation) of an array
 * is the result of adding all numbers together, starting from zero.
 *
 * This runs on `O(n)`, linear time in respect to the array
 *
 * @param {Array<number>} x input
 * @return {number} sum of all input numbers
 * @example
 * sumSimple([1, 2, 3]); // => 6
 */
function sumSimple(x/*: Array<number> */)/*: number */ {
    var value = 0;
    for (var i = 0; i < x.length; i++) {
        value += x[i];
    }
    return value;
}

module.exports = sumSimple;

},{}],67:[function(require,module,exports){
'use strict';
/* @flow */

var standardDeviation = require('./standard_deviation');
var mean = require('./mean');

/**
 * This is to compute [a one-sample t-test](https://en.wikipedia.org/wiki/Student%27s_t-test#One-sample_t-test), comparing the mean
 * of a sample to a known value, x.
 *
 * in this case, we're trying to determine whether the
 * population mean is equal to the value that we know, which is `x`
 * here. usually the results here are used to look up a
 * [p-value](http://en.wikipedia.org/wiki/P-value), which, for
 * a certain level of significance, will let you determine that the
 * null hypothesis can or cannot be rejected.
 *
 * @param {Array<number>} sample an array of numbers as input
 * @param {number} x expected value of the population mean
 * @returns {number} value
 * @example
 * tTest([1, 2, 3, 4, 5, 6], 3.385).toFixed(2); // => '0.16'
 */
function tTest(sample/*: Array<number> */, x/*: number */)/*:number*/ {
    // The mean of the sample
    var sampleMean = mean(sample);

    // The standard deviation of the sample
    var sd = standardDeviation(sample);

    // Square root the length of the sample
    var rootN = Math.sqrt(sample.length);

    // returning the t value
    return (sampleMean - x) / (sd / rootN);
}

module.exports = tTest;

},{"./mean":31,"./standard_deviation":62}],68:[function(require,module,exports){
'use strict';
/* @flow */

var mean = require('./mean');
var sampleVariance = require('./sample_variance');

/**
 * This is to compute [two sample t-test](http://en.wikipedia.org/wiki/Student's_t-test).
 * Tests whether "mean(X)-mean(Y) = difference", (
 * in the most common case, we often have `difference == 0` to test if two samples
 * are likely to be taken from populations with the same mean value) with
 * no prior knowledge on standard deviations of both samples
 * other than the fact that they have the same standard deviation.
 *
 * Usually the results here are used to look up a
 * [p-value](http://en.wikipedia.org/wiki/P-value), which, for
 * a certain level of significance, will let you determine that the
 * null hypothesis can or cannot be rejected.
 *
 * `diff` can be omitted if it equals 0.
 *
 * [This is used to confirm or deny](http://www.monarchlab.org/Lab/Research/Stats/2SampleT.aspx)
 * a null hypothesis that the two populations that have been sampled into
 * `sampleX` and `sampleY` are equal to each other.
 *
 * @param {Array<number>} sampleX a sample as an array of numbers
 * @param {Array<number>} sampleY a sample as an array of numbers
 * @param {number} [difference=0]
 * @returns {number} test result
 * @example
 * ss.tTestTwoSample([1, 2, 3, 4], [3, 4, 5, 6], 0); //= -2.1908902300206643
 */
function tTestTwoSample(
    sampleX/*: Array<number> */,
    sampleY/*: Array<number> */,
    difference/*: number */) {
    var n = sampleX.length,
        m = sampleY.length;

    // If either sample doesn't actually have any values, we can't
    // compute this at all, so we return `null`.
    if (!n || !m) { return null; }

    // default difference (mu) is zero
    if (!difference) {
        difference = 0;
    }

    var meanX = mean(sampleX),
        meanY = mean(sampleY),
        sampleVarianceX = sampleVariance(sampleX),
        sampleVarianceY = sampleVariance(sampleY);

    if (typeof meanX === 'number' &&
        typeof meanY === 'number' &&
        typeof sampleVarianceX === 'number' &&
        typeof sampleVarianceY === 'number') {
        var weightedVariance = ((n - 1) * sampleVarianceX +
            (m - 1) * sampleVarianceY) / (n + m - 2);

        return (meanX - meanY - difference) /
            Math.sqrt(weightedVariance * (1 / n + 1 / m));
    }
}

module.exports = tTestTwoSample;

},{"./mean":31,"./sample_variance":57}],69:[function(require,module,exports){
'use strict';
/* @flow */

/**
 * For a sorted input, counting the number of unique values
 * is possible in constant time and constant memory. This is
 * a simple implementation of the algorithm.
 *
 * Values are compared with `===`, so objects and non-primitive objects
 * are not handled in any special way.
 *
 * @param {Array} input an array of primitive values.
 * @returns {number} count of unique values
 * @example
 * uniqueCountSorted([1, 2, 3]); // => 3
 * uniqueCountSorted([1, 1, 1]); // => 1
 */
function uniqueCountSorted(input/*: Array<any>*/)/*: number */ {
    var uniqueValueCount = 0,
        lastSeenValue;
    for (var i = 0; i < input.length; i++) {
        if (i === 0 || input[i] !== lastSeenValue) {
            lastSeenValue = input[i];
            uniqueValueCount++;
        }
    }
    return uniqueValueCount;
}

module.exports = uniqueCountSorted;

},{}],70:[function(require,module,exports){
'use strict';
/* @flow */

var sumNthPowerDeviations = require('./sum_nth_power_deviations');

/**
 * The [variance](http://en.wikipedia.org/wiki/Variance)
 * is the sum of squared deviations from the mean.
 *
 * This is an implementation of variance, not sample variance:
 * see the `sampleVariance` method if you want a sample measure.
 *
 * @param {Array<number>} x a population
 * @returns {number} variance: a value greater than or equal to zero.
 * zero indicates that all values are identical.
 * @example
 * variance([1, 2, 3, 4, 5, 6]); // => 2.9166666666666665
 */
function variance(x/*: Array<number> */)/*:number*/ {
    // The variance of no numbers is null
    if (x.length === 0) { return NaN; }

    // Find the mean of squared deviations between the
    // mean value and each value.
    return sumNthPowerDeviations(x, 2) / x.length;
}

module.exports = variance;

},{"./sum_nth_power_deviations":65}],71:[function(require,module,exports){
'use strict';
/* @flow */

/**
 * The [Z-Score, or Standard Score](http://en.wikipedia.org/wiki/Standard_score).
 *
 * The standard score is the number of standard deviations an observation
 * or datum is above or below the mean. Thus, a positive standard score
 * represents a datum above the mean, while a negative standard score
 * represents a datum below the mean. It is a dimensionless quantity
 * obtained by subtracting the population mean from an individual raw
 * score and then dividing the difference by the population standard
 * deviation.
 *
 * The z-score is only defined if one knows the population parameters;
 * if one only has a sample set, then the analogous computation with
 * sample mean and sample standard deviation yields the
 * Student's t-statistic.
 *
 * @param {number} x
 * @param {number} mean
 * @param {number} standardDeviation
 * @return {number} z score
 * @example
 * zScore(78, 80, 5); // => -0.4
 */
function zScore(x/*:number*/, mean/*:number*/, standardDeviation/*:number*/)/*:number*/ {
    return (x - mean) / standardDeviation;
}

module.exports = zScore;

},{}],72:[function(require,module,exports){

},{}],73:[function(require,module,exports){
'use strict'

exports.byteLength = byteLength
exports.toByteArray = toByteArray
exports.fromByteArray = fromByteArray

var lookup = []
var revLookup = []
var Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array

var code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
for (var i = 0, len = code.length; i < len; ++i) {
  lookup[i] = code[i]
  revLookup[code.charCodeAt(i)] = i
}

revLookup['-'.charCodeAt(0)] = 62
revLookup['_'.charCodeAt(0)] = 63

function placeHoldersCount (b64) {
  var len = b64.length
  if (len % 4 > 0) {
    throw new Error('Invalid string. Length must be a multiple of 4')
  }

  // the number of equal signs (place holders)
  // if there are two placeholders, than the two characters before it
  // represent one byte
  // if there is only one, then the three characters before it represent 2 bytes
  // this is just a cheap hack to not do indexOf twice
  return b64[len - 2] === '=' ? 2 : b64[len - 1] === '=' ? 1 : 0
}

function byteLength (b64) {
  // base64 is 4/3 + up to two characters of the original data
  return (b64.length * 3 / 4) - placeHoldersCount(b64)
}

function toByteArray (b64) {
  var i, l, tmp, placeHolders, arr
  var len = b64.length
  placeHolders = placeHoldersCount(b64)

  arr = new Arr((len * 3 / 4) - placeHolders)

  // if there are placeholders, only get up to the last complete 4 chars
  l = placeHolders > 0 ? len - 4 : len

  var L = 0

  for (i = 0; i < l; i += 4) {
    tmp = (revLookup[b64.charCodeAt(i)] << 18) | (revLookup[b64.charCodeAt(i + 1)] << 12) | (revLookup[b64.charCodeAt(i + 2)] << 6) | revLookup[b64.charCodeAt(i + 3)]
    arr[L++] = (tmp >> 16) & 0xFF
    arr[L++] = (tmp >> 8) & 0xFF
    arr[L++] = tmp & 0xFF
  }

  if (placeHolders === 2) {
    tmp = (revLookup[b64.charCodeAt(i)] << 2) | (revLookup[b64.charCodeAt(i + 1)] >> 4)
    arr[L++] = tmp & 0xFF
  } else if (placeHolders === 1) {
    tmp = (revLookup[b64.charCodeAt(i)] << 10) | (revLookup[b64.charCodeAt(i + 1)] << 4) | (revLookup[b64.charCodeAt(i + 2)] >> 2)
    arr[L++] = (tmp >> 8) & 0xFF
    arr[L++] = tmp & 0xFF
  }

  return arr
}

function tripletToBase64 (num) {
  return lookup[num >> 18 & 0x3F] + lookup[num >> 12 & 0x3F] + lookup[num >> 6 & 0x3F] + lookup[num & 0x3F]
}

function encodeChunk (uint8, start, end) {
  var tmp
  var output = []
  for (var i = start; i < end; i += 3) {
    tmp = (uint8[i] << 16) + (uint8[i + 1] << 8) + (uint8[i + 2])
    output.push(tripletToBase64(tmp))
  }
  return output.join('')
}

function fromByteArray (uint8) {
  var tmp
  var len = uint8.length
  var extraBytes = len % 3 // if we have 1 byte left, pad 2 bytes
  var output = ''
  var parts = []
  var maxChunkLength = 16383 // must be multiple of 3

  // go through the array every three bytes, we'll deal with trailing stuff later
  for (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) {
    parts.push(encodeChunk(uint8, i, (i + maxChunkLength) > len2 ? len2 : (i + maxChunkLength)))
  }

  // pad the end with zeros, but make sure to not forget the extra bytes
  if (extraBytes === 1) {
    tmp = uint8[len - 1]
    output += lookup[tmp >> 2]
    output += lookup[(tmp << 4) & 0x3F]
    output += '=='
  } else if (extraBytes === 2) {
    tmp = (uint8[len - 2] << 8) + (uint8[len - 1])
    output += lookup[tmp >> 10]
    output += lookup[(tmp >> 4) & 0x3F]
    output += lookup[(tmp << 2) & 0x3F]
    output += '='
  }

  parts.push(output)

  return parts.join('')
}

},{}],74:[function(require,module,exports){
arguments[4][72][0].apply(exports,arguments)
},{"dup":72}],75:[function(require,module,exports){
/*!
 * The buffer module from node.js, for the browser.
 *
 * @author   Feross Aboukhadijeh <https://feross.org>
 * @license  MIT
 */
/* eslint-disable no-proto */

'use strict'

var base64 = require('base64-js')
var ieee754 = require('ieee754')

exports.Buffer = Buffer
exports.SlowBuffer = SlowBuffer
exports.INSPECT_MAX_BYTES = 50

var K_MAX_LENGTH = 0x7fffffff
exports.kMaxLength = K_MAX_LENGTH

/**
 * If `Buffer.TYPED_ARRAY_SUPPORT`:
 *   === true    Use Uint8Array implementation (fastest)
 *   === false   Print warning and recommend using `buffer` v4.x which has an Object
 *               implementation (most compatible, even IE6)
 *
 * Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,
 * Opera 11.6+, iOS 4.2+.
 *
 * We report that the browser does not support typed arrays if the are not subclassable
 * using __proto__. Firefox 4-29 lacks support for adding new properties to `Uint8Array`
 * (See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438). IE 10 lacks support
 * for __proto__ and has a buggy typed array implementation.
 */
Buffer.TYPED_ARRAY_SUPPORT = typedArraySupport()

if (!Buffer.TYPED_ARRAY_SUPPORT && typeof console !== 'undefined' &&
    typeof console.error === 'function') {
  console.error(
    'This browser lacks typed array (Uint8Array) support which is required by ' +
    '`buffer` v5.x. Use `buffer` v4.x if you require old browser support.'
  )
}

function typedArraySupport () {
  // Can typed array instances can be augmented?
  try {
    var arr = new Uint8Array(1)
    arr.__proto__ = {__proto__: Uint8Array.prototype, foo: function () { return 42 }}
    return arr.foo() === 42
  } catch (e) {
    return false
  }
}

function createBuffer (length) {
  if (length > K_MAX_LENGTH) {
    throw new RangeError('Invalid typed array length')
  }
  // Return an augmented `Uint8Array` instance
  var buf = new Uint8Array(length)
  buf.__proto__ = Buffer.prototype
  return buf
}

/**
 * The Buffer constructor returns instances of `Uint8Array` that have their
 * prototype changed to `Buffer.prototype`. Furthermore, `Buffer` is a subclass of
 * `Uint8Array`, so the returned instances will have all the node `Buffer` methods
 * and the `Uint8Array` methods. Square bracket notation works as expected -- it
 * returns a single octet.
 *
 * The `Uint8Array` prototype remains unmodified.
 */

function Buffer (arg, encodingOrOffset, length) {
  // Common case.
  if (typeof arg === 'number') {
    if (typeof encodingOrOffset === 'string') {
      throw new Error(
        'If encoding is specified then the first argument must be a string'
      )
    }
    return allocUnsafe(arg)
  }
  return from(arg, encodingOrOffset, length)
}

// Fix subarray() in ES2016. See: https://github.com/feross/buffer/pull/97
if (typeof Symbol !== 'undefined' && Symbol.species &&
    Buffer[Symbol.species] === Buffer) {
  Object.defineProperty(Buffer, Symbol.species, {
    value: null,
    configurable: true,
    enumerable: false,
    writable: false
  })
}

Buffer.poolSize = 8192 // not used by this implementation

function from (value, encodingOrOffset, length) {
  if (typeof value === 'number') {
    throw new TypeError('"value" argument must not be a number')
  }

  if (isArrayBuffer(value)) {
    return fromArrayBuffer(value, encodingOrOffset, length)
  }

  if (typeof value === 'string') {
    return fromString(value, encodingOrOffset)
  }

  return fromObject(value)
}

/**
 * Functionally equivalent to Buffer(arg, encoding) but throws a TypeError
 * if value is a number.
 * Buffer.from(str[, encoding])
 * Buffer.from(array)
 * Buffer.from(buffer)
 * Buffer.from(arrayBuffer[, byteOffset[, length]])
 **/
Buffer.from = function (value, encodingOrOffset, length) {
  return from(value, encodingOrOffset, length)
}

// Note: Change prototype *after* Buffer.from is defined to workaround Chrome bug:
// https://github.com/feross/buffer/pull/148
Buffer.prototype.__proto__ = Uint8Array.prototype
Buffer.__proto__ = Uint8Array

function assertSize (size) {
  if (typeof size !== 'number') {
    throw new TypeError('"size" argument must be a number')
  } else if (size < 0) {
    throw new RangeError('"size" argument must not be negative')
  }
}

function alloc (size, fill, encoding) {
  assertSize(size)
  if (size <= 0) {
    return createBuffer(size)
  }
  if (fill !== undefined) {
    // Only pay attention to encoding if it's a string. This
    // prevents accidentally sending in a number that would
    // be interpretted as a start offset.
    return typeof encoding === 'string'
      ? createBuffer(size).fill(fill, encoding)
      : createBuffer(size).fill(fill)
  }
  return createBuffer(size)
}

/**
 * Creates a new filled Buffer instance.
 * alloc(size[, fill[, encoding]])
 **/
Buffer.alloc = function (size, fill, encoding) {
  return alloc(size, fill, encoding)
}

function allocUnsafe (size) {
  assertSize(size)
  return createBuffer(size < 0 ? 0 : checked(size) | 0)
}

/**
 * Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance.
 * */
Buffer.allocUnsafe = function (size) {
  return allocUnsafe(size)
}
/**
 * Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance.
 */
Buffer.allocUnsafeSlow = function (size) {
  return allocUnsafe(size)
}

function fromString (string, encoding) {
  if (typeof encoding !== 'string' || encoding === '') {
    encoding = 'utf8'
  }

  if (!Buffer.isEncoding(encoding)) {
    throw new TypeError('"encoding" must be a valid string encoding')
  }

  var length = byteLength(string, encoding) | 0
  var buf = createBuffer(length)

  var actual = buf.write(string, encoding)

  if (actual !== length) {
    // Writing a hex string, for example, that contains invalid characters will
    // cause everything after the first invalid character to be ignored. (e.g.
    // 'abxxcd' will be treated as 'ab')
    buf = buf.slice(0, actual)
  }

  return buf
}

function fromArrayLike (array) {
  var length = array.length < 0 ? 0 : checked(array.length) | 0
  var buf = createBuffer(length)
  for (var i = 0; i < length; i += 1) {
    buf[i] = array[i] & 255
  }
  return buf
}

function fromArrayBuffer (array, byteOffset, length) {
  if (byteOffset < 0 || array.byteLength < byteOffset) {
    throw new RangeError('\'offset\' is out of bounds')
  }

  if (array.byteLength < byteOffset + (length || 0)) {
    throw new RangeError('\'length\' is out of bounds')
  }

  var buf
  if (byteOffset === undefined && length === undefined) {
    buf = new Uint8Array(array)
  } else if (length === undefined) {
    buf = new Uint8Array(array, byteOffset)
  } else {
    buf = new Uint8Array(array, byteOffset, length)
  }

  // Return an augmented `Uint8Array` instance
  buf.__proto__ = Buffer.prototype
  return buf
}

function fromObject (obj) {
  if (Buffer.isBuffer(obj)) {
    var len = checked(obj.length) | 0
    var buf = createBuffer(len)

    if (buf.length === 0) {
      return buf
    }

    obj.copy(buf, 0, 0, len)
    return buf
  }

  if (obj) {
    if (isArrayBufferView(obj) || 'length' in obj) {
      if (typeof obj.length !== 'number' || numberIsNaN(obj.length)) {
        return createBuffer(0)
      }
      return fromArrayLike(obj)
    }

    if (obj.type === 'Buffer' && Array.isArray(obj.data)) {
      return fromArrayLike(obj.data)
    }
  }

  throw new TypeError('First argument must be a string, Buffer, ArrayBuffer, Array, or array-like object.')
}

function checked (length) {
  // Note: cannot use `length < K_MAX_LENGTH` here because that fails when
  // length is NaN (which is otherwise coerced to zero.)
  if (length >= K_MAX_LENGTH) {
    throw new RangeError('Attempt to allocate Buffer larger than maximum ' +
                         'size: 0x' + K_MAX_LENGTH.toString(16) + ' bytes')
  }
  return length | 0
}

function SlowBuffer (length) {
  if (+length != length) { // eslint-disable-line eqeqeq
    length = 0
  }
  return Buffer.alloc(+length)
}

Buffer.isBuffer = function isBuffer (b) {
  return b != null && b._isBuffer === true
}

Buffer.compare = function compare (a, b) {
  if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) {
    throw new TypeError('Arguments must be Buffers')
  }

  if (a === b) return 0

  var x = a.length
  var y = b.length

  for (var i = 0, len = Math.min(x, y); i < len; ++i) {
    if (a[i] !== b[i]) {
      x = a[i]
      y = b[i]
      break
    }
  }

  if (x < y) return -1
  if (y < x) return 1
  return 0
}

Buffer.isEncoding = function isEncoding (encoding) {
  switch (String(encoding).toLowerCase()) {
    case 'hex':
    case 'utf8':
    case 'utf-8':
    case 'ascii':
    case 'latin1':
    case 'binary':
    case 'base64':
    case 'ucs2':
    case 'ucs-2':
    case 'utf16le':
    case 'utf-16le':
      return true
    default:
      return false
  }
}

Buffer.concat = function concat (list, length) {
  if (!Array.isArray(list)) {
    throw new TypeError('"list" argument must be an Array of Buffers')
  }

  if (list.length === 0) {
    return Buffer.alloc(0)
  }

  var i
  if (length === undefined) {
    length = 0
    for (i = 0; i < list.length; ++i) {
      length += list[i].length
    }
  }

  var buffer = Buffer.allocUnsafe(length)
  var pos = 0
  for (i = 0; i < list.length; ++i) {
    var buf = list[i]
    if (!Buffer.isBuffer(buf)) {
      throw new TypeError('"list" argument must be an Array of Buffers')
    }
    buf.copy(buffer, pos)
    pos += buf.length
  }
  return buffer
}

function byteLength (string, encoding) {
  if (Buffer.isBuffer(string)) {
    return string.length
  }
  if (isArrayBufferView(string) || isArrayBuffer(string)) {
    return string.byteLength
  }
  if (typeof string !== 'string') {
    string = '' + string
  }

  var len = string.length
  if (len === 0) return 0

  // Use a for loop to avoid recursion
  var loweredCase = false
  for (;;) {
    switch (encoding) {
      case 'ascii':
      case 'latin1':
      case 'binary':
        return len
      case 'utf8':
      case 'utf-8':
      case undefined:
        return utf8ToBytes(string).length
      case 'ucs2':
      case 'ucs-2':
      case 'utf16le':
      case 'utf-16le':
        return len * 2
      case 'hex':
        return len >>> 1
      case 'base64':
        return base64ToBytes(string).length
      default:
        if (loweredCase) return utf8ToBytes(string).length // assume utf8
        encoding = ('' + encoding).toLowerCase()
        loweredCase = true
    }
  }
}
Buffer.byteLength = byteLength

function slowToString (encoding, start, end) {
  var loweredCase = false

  // No need to verify that "this.length <= MAX_UINT32" since it's a read-only
  // property of a typed array.

  // This behaves neither like String nor Uint8Array in that we set start/end
  // to their upper/lower bounds if the value passed is out of range.
  // undefined is handled specially as per ECMA-262 6th Edition,
  // Section 13.3.3.7 Runtime Semantics: KeyedBindingInitialization.
  if (start === undefined || start < 0) {
    start = 0
  }
  // Return early if start > this.length. Done here to prevent potential uint32
  // coercion fail below.
  if (start > this.length) {
    return ''
  }

  if (end === undefined || end > this.length) {
    end = this.length
  }

  if (end <= 0) {
    return ''
  }

  // Force coersion to uint32. This will also coerce falsey/NaN values to 0.
  end >>>= 0
  start >>>= 0

  if (end <= start) {
    return ''
  }

  if (!encoding) encoding = 'utf8'

  while (true) {
    switch (encoding) {
      case 'hex':
        return hexSlice(this, start, end)

      case 'utf8':
      case 'utf-8':
        return utf8Slice(this, start, end)

      case 'ascii':
        return asciiSlice(this, start, end)

      case 'latin1':
      case 'binary':
        return latin1Slice(this, start, end)

      case 'base64':
        return base64Slice(this, start, end)

      case 'ucs2':
      case 'ucs-2':
      case 'utf16le':
      case 'utf-16le':
        return utf16leSlice(this, start, end)

      default:
        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
        encoding = (encoding + '').toLowerCase()
        loweredCase = true
    }
  }
}

// This property is used by `Buffer.isBuffer` (and the `is-buffer` npm package)
// to detect a Buffer instance. It's not possible to use `instanceof Buffer`
// reliably in a browserify context because there could be multiple different
// copies of the 'buffer' package in use. This method works even for Buffer
// instances that were created from another copy of the `buffer` package.
// See: https://github.com/feross/buffer/issues/154
Buffer.prototype._isBuffer = true

function swap (b, n, m) {
  var i = b[n]
  b[n] = b[m]
  b[m] = i
}

Buffer.prototype.swap16 = function swap16 () {
  var len = this.length
  if (len % 2 !== 0) {
    throw new RangeError('Buffer size must be a multiple of 16-bits')
  }
  for (var i = 0; i < len; i += 2) {
    swap(this, i, i + 1)
  }
  return this
}

Buffer.prototype.swap32 = function swap32 () {
  var len = this.length
  if (len % 4 !== 0) {
    throw new RangeError('Buffer size must be a multiple of 32-bits')
  }
  for (var i = 0; i < len; i += 4) {
    swap(this, i, i + 3)
    swap(this, i + 1, i + 2)
  }
  return this
}

Buffer.prototype.swap64 = function swap64 () {
  var len = this.length
  if (len % 8 !== 0) {
    throw new RangeError('Buffer size must be a multiple of 64-bits')
  }
  for (var i = 0; i < len; i += 8) {
    swap(this, i, i + 7)
    swap(this, i + 1, i + 6)
    swap(this, i + 2, i + 5)
    swap(this, i + 3, i + 4)
  }
  return this
}

Buffer.prototype.toString = function toString () {
  var length = this.length
  if (length === 0) return ''
  if (arguments.length === 0) return utf8Slice(this, 0, length)
  return slowToString.apply(this, arguments)
}

Buffer.prototype.equals = function equals (b) {
  if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')
  if (this === b) return true
  return Buffer.compare(this, b) === 0
}

Buffer.prototype.inspect = function inspect () {
  var str = ''
  var max = exports.INSPECT_MAX_BYTES
  if (this.length > 0) {
    str = this.toString('hex', 0, max).match(/.{2}/g).join(' ')
    if (this.length > max) str += ' ... '
  }
  return '<Buffer ' + str + '>'
}

Buffer.prototype.compare = function compare (target, start, end, thisStart, thisEnd) {
  if (!Buffer.isBuffer(target)) {
    throw new TypeError('Argument must be a Buffer')
  }

  if (start === undefined) {
    start = 0
  }
  if (end === undefined) {
    end = target ? target.length : 0
  }
  if (thisStart === undefined) {
    thisStart = 0
  }
  if (thisEnd === undefined) {
    thisEnd = this.length
  }

  if (start < 0 || end > target.length || thisStart < 0 || thisEnd > this.length) {
    throw new RangeError('out of range index')
  }

  if (thisStart >= thisEnd && start >= end) {
    return 0
  }
  if (thisStart >= thisEnd) {
    return -1
  }
  if (start >= end) {
    return 1
  }

  start >>>= 0
  end >>>= 0
  thisStart >>>= 0
  thisEnd >>>= 0

  if (this === target) return 0

  var x = thisEnd - thisStart
  var y = end - start
  var len = Math.min(x, y)

  var thisCopy = this.slice(thisStart, thisEnd)
  var targetCopy = target.slice(start, end)

  for (var i = 0; i < len; ++i) {
    if (thisCopy[i] !== targetCopy[i]) {
      x = thisCopy[i]
      y = targetCopy[i]
      break
    }
  }

  if (x < y) return -1
  if (y < x) return 1
  return 0
}

// Finds either the first index of `val` in `buffer` at offset >= `byteOffset`,
// OR the last index of `val` in `buffer` at offset <= `byteOffset`.
//
// Arguments:
// - buffer - a Buffer to search
// - val - a string, Buffer, or number
// - byteOffset - an index into `buffer`; will be clamped to an int32
// - encoding - an optional encoding, relevant is val is a string
// - dir - true for indexOf, false for lastIndexOf
function bidirectionalIndexOf (buffer, val, byteOffset, encoding, dir) {
  // Empty buffer means no match
  if (buffer.length === 0) return -1

  // Normalize byteOffset
  if (typeof byteOffset === 'string') {
    encoding = byteOffset
    byteOffset = 0
  } else if (byteOffset > 0x7fffffff) {
    byteOffset = 0x7fffffff
  } else if (byteOffset < -0x80000000) {
    byteOffset = -0x80000000
  }
  byteOffset = +byteOffset  // Coerce to Number.
  if (numberIsNaN(byteOffset)) {
    // byteOffset: it it's undefined, null, NaN, "foo", etc, search whole buffer
    byteOffset = dir ? 0 : (buffer.length - 1)
  }

  // Normalize byteOffset: negative offsets start from the end of the buffer
  if (byteOffset < 0) byteOffset = buffer.length + byteOffset
  if (byteOffset >= buffer.length) {
    if (dir) return -1
    else byteOffset = buffer.length - 1
  } else if (byteOffset < 0) {
    if (dir) byteOffset = 0
    else return -1
  }

  // Normalize val
  if (typeof val === 'string') {
    val = Buffer.from(val, encoding)
  }

  // Finally, search either indexOf (if dir is true) or lastIndexOf
  if (Buffer.isBuffer(val)) {
    // Special case: looking for empty string/buffer always fails
    if (val.length === 0) {
      return -1
    }
    return arrayIndexOf(buffer, val, byteOffset, encoding, dir)
  } else if (typeof val === 'number') {
    val = val & 0xFF // Search for a byte value [0-255]
    if (typeof Uint8Array.prototype.indexOf === 'function') {
      if (dir) {
        return Uint8Array.prototype.indexOf.call(buffer, val, byteOffset)
      } else {
        return Uint8Array.prototype.lastIndexOf.call(buffer, val, byteOffset)
      }
    }
    return arrayIndexOf(buffer, [ val ], byteOffset, encoding, dir)
  }

  throw new TypeError('val must be string, number or Buffer')
}

function arrayIndexOf (arr, val, byteOffset, encoding, dir) {
  var indexSize = 1
  var arrLength = arr.length
  var valLength = val.length

  if (encoding !== undefined) {
    encoding = String(encoding).toLowerCase()
    if (encoding === 'ucs2' || encoding === 'ucs-2' ||
        encoding === 'utf16le' || encoding === 'utf-16le') {
      if (arr.length < 2 || val.length < 2) {
        return -1
      }
      indexSize = 2
      arrLength /= 2
      valLength /= 2
      byteOffset /= 2
    }
  }

  function read (buf, i) {
    if (indexSize === 1) {
      return buf[i]
    } else {
      return buf.readUInt16BE(i * indexSize)
    }
  }

  var i
  if (dir) {
    var foundIndex = -1
    for (i = byteOffset; i < arrLength; i++) {
      if (read(arr, i) === read(val, foundIndex === -1 ? 0 : i - foundIndex)) {
        if (foundIndex === -1) foundIndex = i
        if (i - foundIndex + 1 === valLength) return foundIndex * indexSize
      } else {
        if (foundIndex !== -1) i -= i - foundIndex
        foundIndex = -1
      }
    }
  } else {
    if (byteOffset + valLength > arrLength) byteOffset = arrLength - valLength
    for (i = byteOffset; i >= 0; i--) {
      var found = true
      for (var j = 0; j < valLength; j++) {
        if (read(arr, i + j) !== read(val, j)) {
          found = false
          break
        }
      }
      if (found) return i
    }
  }

  return -1
}

Buffer.prototype.includes = function includes (val, byteOffset, encoding) {
  return this.indexOf(val, byteOffset, encoding) !== -1
}

Buffer.prototype.indexOf = function indexOf (val, byteOffset, encoding) {
  return bidirectionalIndexOf(this, val, byteOffset, encoding, true)
}

Buffer.prototype.lastIndexOf = function lastIndexOf (val, byteOffset, encoding) {
  return bidirectionalIndexOf(this, val, byteOffset, encoding, false)
}

function hexWrite (buf, string, offset, length) {
  offset = Number(offset) || 0
  var remaining = buf.length - offset
  if (!length) {
    length = remaining
  } else {
    length = Number(length)
    if (length > remaining) {
      length = remaining
    }
  }

  // must be an even number of digits
  var strLen = string.length
  if (strLen % 2 !== 0) throw new TypeError('Invalid hex string')

  if (length > strLen / 2) {
    length = strLen / 2
  }
  for (var i = 0; i < length; ++i) {
    var parsed = parseInt(string.substr(i * 2, 2), 16)
    if (numberIsNaN(parsed)) return i
    buf[offset + i] = parsed
  }
  return i
}

function utf8Write (buf, string, offset, length) {
  return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length)
}

function asciiWrite (buf, string, offset, length) {
  return blitBuffer(asciiToBytes(string), buf, offset, length)
}

function latin1Write (buf, string, offset, length) {
  return asciiWrite(buf, string, offset, length)
}

function base64Write (buf, string, offset, length) {
  return blitBuffer(base64ToBytes(string), buf, offset, length)
}

function ucs2Write (buf, string, offset, length) {
  return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length)
}

Buffer.prototype.write = function write (string, offset, length, encoding) {
  // Buffer#write(string)
  if (offset === undefined) {
    encoding = 'utf8'
    length = this.length
    offset = 0
  // Buffer#write(string, encoding)
  } else if (length === undefined && typeof offset === 'string') {
    encoding = offset
    length = this.length
    offset = 0
  // Buffer#write(string, offset[, length][, encoding])
  } else if (isFinite(offset)) {
    offset = offset >>> 0
    if (isFinite(length)) {
      length = length >>> 0
      if (encoding === undefined) encoding = 'utf8'
    } else {
      encoding = length
      length = undefined
    }
  } else {
    throw new Error(
      'Buffer.write(string, encoding, offset[, length]) is no longer supported'
    )
  }

  var remaining = this.length - offset
  if (length === undefined || length > remaining) length = remaining

  if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) {
    throw new RangeError('Attempt to write outside buffer bounds')
  }

  if (!encoding) encoding = 'utf8'

  var loweredCase = false
  for (;;) {
    switch (encoding) {
      case 'hex':
        return hexWrite(this, string, offset, length)

      case 'utf8':
      case 'utf-8':
        return utf8Write(this, string, offset, length)

      case 'ascii':
        return asciiWrite(this, string, offset, length)

      case 'latin1':
      case 'binary':
        return latin1Write(this, string, offset, length)

      case 'base64':
        // Warning: maxLength not taken into account in base64Write
        return base64Write(this, string, offset, length)

      case 'ucs2':
      case 'ucs-2':
      case 'utf16le':
      case 'utf-16le':
        return ucs2Write(this, string, offset, length)

      default:
        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)
        encoding = ('' + encoding).toLowerCase()
        loweredCase = true
    }
  }
}

Buffer.prototype.toJSON = function toJSON () {
  return {
    type: 'Buffer',
    data: Array.prototype.slice.call(this._arr || this, 0)
  }
}

function base64Slice (buf, start, end) {
  if (start === 0 && end === buf.length) {
    return base64.fromByteArray(buf)
  } else {
    return base64.fromByteArray(buf.slice(start, end))
  }
}

function utf8Slice (buf, start, end) {
  end = Math.min(buf.length, end)
  var res = []

  var i = start
  while (i < end) {
    var firstByte = buf[i]
    var codePoint = null
    var bytesPerSequence = (firstByte > 0xEF) ? 4
      : (firstByte > 0xDF) ? 3
      : (firstByte > 0xBF) ? 2
      : 1

    if (i + bytesPerSequence <= end) {
      var secondByte, thirdByte, fourthByte, tempCodePoint

      switch (bytesPerSequence) {
        case 1:
          if (firstByte < 0x80) {
            codePoint = firstByte
          }
          break
        case 2:
          secondByte = buf[i + 1]
          if ((secondByte & 0xC0) === 0x80) {
            tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F)
            if (tempCodePoint > 0x7F) {
              codePoint = tempCodePoint
            }
          }
          break
        case 3:
          secondByte = buf[i + 1]
          thirdByte = buf[i + 2]
          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80) {
            tempCodePoint = (firstByte & 0xF) << 0xC | (secondByte & 0x3F) << 0x6 | (thirdByte & 0x3F)
            if (tempCodePoint > 0x7FF && (tempCodePoint < 0xD800 || tempCodePoint > 0xDFFF)) {
              codePoint = tempCodePoint
            }
          }
          break
        case 4:
          secondByte = buf[i + 1]
          thirdByte = buf[i + 2]
          fourthByte = buf[i + 3]
          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80 && (fourthByte & 0xC0) === 0x80) {
            tempCodePoint = (firstByte & 0xF) << 0x12 | (secondByte & 0x3F) << 0xC | (thirdByte & 0x3F) << 0x6 | (fourthByte & 0x3F)
            if (tempCodePoint > 0xFFFF && tempCodePoint < 0x110000) {
              codePoint = tempCodePoint
            }
          }
      }
    }

    if (codePoint === null) {
      // we did not generate a valid codePoint so insert a
      // replacement char (U+FFFD) and advance only 1 byte
      codePoint = 0xFFFD
      bytesPerSequence = 1
    } else if (codePoint > 0xFFFF) {
      // encode to utf16 (surrogate pair dance)
      codePoint -= 0x10000
      res.push(codePoint >>> 10 & 0x3FF | 0xD800)
      codePoint = 0xDC00 | codePoint & 0x3FF
    }

    res.push(codePoint)
    i += bytesPerSequence
  }

  return decodeCodePointsArray(res)
}

// Based on http://stackoverflow.com/a/22747272/680742, the browser with
// the lowest limit is Chrome, with 0x10000 args.
// We go 1 magnitude less, for safety
var MAX_ARGUMENTS_LENGTH = 0x1000

function decodeCodePointsArray (codePoints) {
  var len = codePoints.length
  if (len <= MAX_ARGUMENTS_LENGTH) {
    return String.fromCharCode.apply(String, codePoints) // avoid extra slice()
  }

  // Decode in chunks to avoid "call stack size exceeded".
  var res = ''
  var i = 0
  while (i < len) {
    res += String.fromCharCode.apply(
      String,
      codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH)
    )
  }
  return res
}

function asciiSlice (buf, start, end) {
  var ret = ''
  end = Math.min(buf.length, end)

  for (var i = start; i < end; ++i) {
    ret += String.fromCharCode(buf[i] & 0x7F)
  }
  return ret
}

function latin1Slice (buf, start, end) {
  var ret = ''
  end = Math.min(buf.length, end)

  for (var i = start; i < end; ++i) {
    ret += String.fromCharCode(buf[i])
  }
  return ret
}

function hexSlice (buf, start, end) {
  var len = buf.length

  if (!start || start < 0) start = 0
  if (!end || end < 0 || end > len) end = len

  var out = ''
  for (var i = start; i < end; ++i) {
    out += toHex(buf[i])
  }
  return out
}

function utf16leSlice (buf, start, end) {
  var bytes = buf.slice(start, end)
  var res = ''
  for (var i = 0; i < bytes.length; i += 2) {
    res += String.fromCharCode(bytes[i] + (bytes[i + 1] * 256))
  }
  return res
}

Buffer.prototype.slice = function slice (start, end) {
  var len = this.length
  start = ~~start
  end = end === undefined ? len : ~~end

  if (start < 0) {
    start += len
    if (start < 0) start = 0
  } else if (start > len) {
    start = len
  }

  if (end < 0) {
    end += len
    if (end < 0) end = 0
  } else if (end > len) {
    end = len
  }

  if (end < start) end = start

  var newBuf = this.subarray(start, end)
  // Return an augmented `Uint8Array` instance
  newBuf.__proto__ = Buffer.prototype
  return newBuf
}

/*
 * Need to make sure that buffer isn't trying to write out of bounds.
 */
function checkOffset (offset, ext, length) {
  if ((offset % 1) !== 0 || offset < 0) throw new RangeError('offset is not uint')
  if (offset + ext > length) throw new RangeError('Trying to access beyond buffer length')
}

Buffer.prototype.readUIntLE = function readUIntLE (offset, byteLength, noAssert) {
  offset = offset >>> 0
  byteLength = byteLength >>> 0
  if (!noAssert) checkOffset(offset, byteLength, this.length)

  var val = this[offset]
  var mul = 1
  var i = 0
  while (++i < byteLength && (mul *= 0x100)) {
    val += this[offset + i] * mul
  }

  return val
}

Buffer.prototype.readUIntBE = function readUIntBE (offset, byteLength, noAssert) {
  offset = offset >>> 0
  byteLength = byteLength >>> 0
  if (!noAssert) {
    checkOffset(offset, byteLength, this.length)
  }

  var val = this[offset + --byteLength]
  var mul = 1
  while (byteLength > 0 && (mul *= 0x100)) {
    val += this[offset + --byteLength] * mul
  }

  return val
}

Buffer.prototype.readUInt8 = function readUInt8 (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 1, this.length)
  return this[offset]
}

Buffer.prototype.readUInt16LE = function readUInt16LE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 2, this.length)
  return this[offset] | (this[offset + 1] << 8)
}

Buffer.prototype.readUInt16BE = function readUInt16BE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 2, this.length)
  return (this[offset] << 8) | this[offset + 1]
}

Buffer.prototype.readUInt32LE = function readUInt32LE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 4, this.length)

  return ((this[offset]) |
      (this[offset + 1] << 8) |
      (this[offset + 2] << 16)) +
      (this[offset + 3] * 0x1000000)
}

Buffer.prototype.readUInt32BE = function readUInt32BE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 4, this.length)

  return (this[offset] * 0x1000000) +
    ((this[offset + 1] << 16) |
    (this[offset + 2] << 8) |
    this[offset + 3])
}

Buffer.prototype.readIntLE = function readIntLE (offset, byteLength, noAssert) {
  offset = offset >>> 0
  byteLength = byteLength >>> 0
  if (!noAssert) checkOffset(offset, byteLength, this.length)

  var val = this[offset]
  var mul = 1
  var i = 0
  while (++i < byteLength && (mul *= 0x100)) {
    val += this[offset + i] * mul
  }
  mul *= 0x80

  if (val >= mul) val -= Math.pow(2, 8 * byteLength)

  return val
}

Buffer.prototype.readIntBE = function readIntBE (offset, byteLength, noAssert) {
  offset = offset >>> 0
  byteLength = byteLength >>> 0
  if (!noAssert) checkOffset(offset, byteLength, this.length)

  var i = byteLength
  var mul = 1
  var val = this[offset + --i]
  while (i > 0 && (mul *= 0x100)) {
    val += this[offset + --i] * mul
  }
  mul *= 0x80

  if (val >= mul) val -= Math.pow(2, 8 * byteLength)

  return val
}

Buffer.prototype.readInt8 = function readInt8 (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 1, this.length)
  if (!(this[offset] & 0x80)) return (this[offset])
  return ((0xff - this[offset] + 1) * -1)
}

Buffer.prototype.readInt16LE = function readInt16LE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 2, this.length)
  var val = this[offset] | (this[offset + 1] << 8)
  return (val & 0x8000) ? val | 0xFFFF0000 : val
}

Buffer.prototype.readInt16BE = function readInt16BE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 2, this.length)
  var val = this[offset + 1] | (this[offset] << 8)
  return (val & 0x8000) ? val | 0xFFFF0000 : val
}

Buffer.prototype.readInt32LE = function readInt32LE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 4, this.length)

  return (this[offset]) |
    (this[offset + 1] << 8) |
    (this[offset + 2] << 16) |
    (this[offset + 3] << 24)
}

Buffer.prototype.readInt32BE = function readInt32BE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 4, this.length)

  return (this[offset] << 24) |
    (this[offset + 1] << 16) |
    (this[offset + 2] << 8) |
    (this[offset + 3])
}

Buffer.prototype.readFloatLE = function readFloatLE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 4, this.length)
  return ieee754.read(this, offset, true, 23, 4)
}

Buffer.prototype.readFloatBE = function readFloatBE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 4, this.length)
  return ieee754.read(this, offset, false, 23, 4)
}

Buffer.prototype.readDoubleLE = function readDoubleLE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 8, this.length)
  return ieee754.read(this, offset, true, 52, 8)
}

Buffer.prototype.readDoubleBE = function readDoubleBE (offset, noAssert) {
  offset = offset >>> 0
  if (!noAssert) checkOffset(offset, 8, this.length)
  return ieee754.read(this, offset, false, 52, 8)
}

function checkInt (buf, value, offset, ext, max, min) {
  if (!Buffer.isBuffer(buf)) throw new TypeError('"buffer" argument must be a Buffer instance')
  if (value > max || value < min) throw new RangeError('"value" argument is out of bounds')
  if (offset + ext > buf.length) throw new RangeError('Index out of range')
}

Buffer.prototype.writeUIntLE = function writeUIntLE (value, offset, byteLength, noAssert) {
  value = +value
  offset = offset >>> 0
  byteLength = byteLength >>> 0
  if (!noAssert) {
    var maxBytes = Math.pow(2, 8 * byteLength) - 1
    checkInt(this, value, offset, byteLength, maxBytes, 0)
  }

  var mul = 1
  var i = 0
  this[offset] = value & 0xFF
  while (++i < byteLength && (mul *= 0x100)) {
    this[offset + i] = (value / mul) & 0xFF
  }

  return offset + byteLength
}

Buffer.prototype.writeUIntBE = function writeUIntBE (value, offset, byteLength, noAssert) {
  value = +value
  offset = offset >>> 0
  byteLength = byteLength >>> 0
  if (!noAssert) {
    var maxBytes = Math.pow(2, 8 * byteLength) - 1
    checkInt(this, value, offset, byteLength, maxBytes, 0)
  }

  var i = byteLength - 1
  var mul = 1
  this[offset + i] = value & 0xFF
  while (--i >= 0 && (mul *= 0x100)) {
    this[offset + i] = (value / mul) & 0xFF
  }

  return offset + byteLength
}

Buffer.prototype.writeUInt8 = function writeUInt8 (value, offset, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) checkInt(this, value, offset, 1, 0xff, 0)
  this[offset] = (value & 0xff)
  return offset + 1
}

Buffer.prototype.writeUInt16LE = function writeUInt16LE (value, offset, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
  this[offset] = (value & 0xff)
  this[offset + 1] = (value >>> 8)
  return offset + 2
}

Buffer.prototype.writeUInt16BE = function writeUInt16BE (value, offset, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)
  this[offset] = (value >>> 8)
  this[offset + 1] = (value & 0xff)
  return offset + 2
}

Buffer.prototype.writeUInt32LE = function writeUInt32LE (value, offset, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
  this[offset + 3] = (value >>> 24)
  this[offset + 2] = (value >>> 16)
  this[offset + 1] = (value >>> 8)
  this[offset] = (value & 0xff)
  return offset + 4
}

Buffer.prototype.writeUInt32BE = function writeUInt32BE (value, offset, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)
  this[offset] = (value >>> 24)
  this[offset + 1] = (value >>> 16)
  this[offset + 2] = (value >>> 8)
  this[offset + 3] = (value & 0xff)
  return offset + 4
}

Buffer.prototype.writeIntLE = function writeIntLE (value, offset, byteLength, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) {
    var limit = Math.pow(2, (8 * byteLength) - 1)

    checkInt(this, value, offset, byteLength, limit - 1, -limit)
  }

  var i = 0
  var mul = 1
  var sub = 0
  this[offset] = value & 0xFF
  while (++i < byteLength && (mul *= 0x100)) {
    if (value < 0 && sub === 0 && this[offset + i - 1] !== 0) {
      sub = 1
    }
    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
  }

  return offset + byteLength
}

Buffer.prototype.writeIntBE = function writeIntBE (value, offset, byteLength, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) {
    var limit = Math.pow(2, (8 * byteLength) - 1)

    checkInt(this, value, offset, byteLength, limit - 1, -limit)
  }

  var i = byteLength - 1
  var mul = 1
  var sub = 0
  this[offset + i] = value & 0xFF
  while (--i >= 0 && (mul *= 0x100)) {
    if (value < 0 && sub === 0 && this[offset + i + 1] !== 0) {
      sub = 1
    }
    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF
  }

  return offset + byteLength
}

Buffer.prototype.writeInt8 = function writeInt8 (value, offset, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80)
  if (value < 0) value = 0xff + value + 1
  this[offset] = (value & 0xff)
  return offset + 1
}

Buffer.prototype.writeInt16LE = function writeInt16LE (value, offset, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
  this[offset] = (value & 0xff)
  this[offset + 1] = (value >>> 8)
  return offset + 2
}

Buffer.prototype.writeInt16BE = function writeInt16BE (value, offset, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)
  this[offset] = (value >>> 8)
  this[offset + 1] = (value & 0xff)
  return offset + 2
}

Buffer.prototype.writeInt32LE = function writeInt32LE (value, offset, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
  this[offset] = (value & 0xff)
  this[offset + 1] = (value >>> 8)
  this[offset + 2] = (value >>> 16)
  this[offset + 3] = (value >>> 24)
  return offset + 4
}

Buffer.prototype.writeInt32BE = function writeInt32BE (value, offset, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)
  if (value < 0) value = 0xffffffff + value + 1
  this[offset] = (value >>> 24)
  this[offset + 1] = (value >>> 16)
  this[offset + 2] = (value >>> 8)
  this[offset + 3] = (value & 0xff)
  return offset + 4
}

function checkIEEE754 (buf, value, offset, ext, max, min) {
  if (offset + ext > buf.length) throw new RangeError('Index out of range')
  if (offset < 0) throw new RangeError('Index out of range')
}

function writeFloat (buf, value, offset, littleEndian, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) {
    checkIEEE754(buf, value, offset, 4, 3.4028234663852886e+38, -3.4028234663852886e+38)
  }
  ieee754.write(buf, value, offset, littleEndian, 23, 4)
  return offset + 4
}

Buffer.prototype.writeFloatLE = function writeFloatLE (value, offset, noAssert) {
  return writeFloat(this, value, offset, true, noAssert)
}

Buffer.prototype.writeFloatBE = function writeFloatBE (value, offset, noAssert) {
  return writeFloat(this, value, offset, false, noAssert)
}

function writeDouble (buf, value, offset, littleEndian, noAssert) {
  value = +value
  offset = offset >>> 0
  if (!noAssert) {
    checkIEEE754(buf, value, offset, 8, 1.7976931348623157E+308, -1.7976931348623157E+308)
  }
  ieee754.write(buf, value, offset, littleEndian, 52, 8)
  return offset + 8
}

Buffer.prototype.writeDoubleLE = function writeDoubleLE (value, offset, noAssert) {
  return writeDouble(this, value, offset, true, noAssert)
}

Buffer.prototype.writeDoubleBE = function writeDoubleBE (value, offset, noAssert) {
  return writeDouble(this, value, offset, false, noAssert)
}

// copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length)
Buffer.prototype.copy = function copy (target, targetStart, start, end) {
  if (!start) start = 0
  if (!end && end !== 0) end = this.length
  if (targetStart >= target.length) targetStart = target.length
  if (!targetStart) targetStart = 0
  if (end > 0 && end < start) end = start

  // Copy 0 bytes; we're done
  if (end === start) return 0
  if (target.length === 0 || this.length === 0) return 0

  // Fatal error conditions
  if (targetStart < 0) {
    throw new RangeError('targetStart out of bounds')
  }
  if (start < 0 || start >= this.length) throw new RangeError('sourceStart out of bounds')
  if (end < 0) throw new RangeError('sourceEnd out of bounds')

  // Are we oob?
  if (end > this.length) end = this.length
  if (target.length - targetStart < end - start) {
    end = target.length - targetStart + start
  }

  var len = end - start
  var i

  if (this === target && start < targetStart && targetStart < end) {
    // descending copy from end
    for (i = len - 1; i >= 0; --i) {
      target[i + targetStart] = this[i + start]
    }
  } else if (len < 1000) {
    // ascending copy from start
    for (i = 0; i < len; ++i) {
      target[i + targetStart] = this[i + start]
    }
  } else {
    Uint8Array.prototype.set.call(
      target,
      this.subarray(start, start + len),
      targetStart
    )
  }

  return len
}

// Usage:
//    buffer.fill(number[, offset[, end]])
//    buffer.fill(buffer[, offset[, end]])
//    buffer.fill(string[, offset[, end]][, encoding])
Buffer.prototype.fill = function fill (val, start, end, encoding) {
  // Handle string cases:
  if (typeof val === 'string') {
    if (typeof start === 'string') {
      encoding = start
      start = 0
      end = this.length
    } else if (typeof end === 'string') {
      encoding = end
      end = this.length
    }
    if (val.length === 1) {
      var code = val.charCodeAt(0)
      if (code < 256) {
        val = code
      }
    }
    if (encoding !== undefined && typeof encoding !== 'string') {
      throw new TypeError('encoding must be a string')
    }
    if (typeof encoding === 'string' && !Buffer.isEncoding(encoding)) {
      throw new TypeError('Unknown encoding: ' + encoding)
    }
  } else if (typeof val === 'number') {
    val = val & 255
  }

  // Invalid ranges are not set to a default, so can range check early.
  if (start < 0 || this.length < start || this.length < end) {
    throw new RangeError('Out of range index')
  }

  if (end <= start) {
    return this
  }

  start = start >>> 0
  end = end === undefined ? this.length : end >>> 0

  if (!val) val = 0

  var i
  if (typeof val === 'number') {
    for (i = start; i < end; ++i) {
      this[i] = val
    }
  } else {
    var bytes = Buffer.isBuffer(val)
      ? val
      : new Buffer(val, encoding)
    var len = bytes.length
    for (i = 0; i < end - start; ++i) {
      this[i + start] = bytes[i % len]
    }
  }

  return this
}

// HELPER FUNCTIONS
// ================

var INVALID_BASE64_RE = /[^+/0-9A-Za-z-_]/g

function base64clean (str) {
  // Node strips out invalid characters like \n and \t from the string, base64-js does not
  str = str.trim().replace(INVALID_BASE64_RE, '')
  // Node converts strings with length < 2 to ''
  if (str.length < 2) return ''
  // Node allows for non-padded base64 strings (missing trailing ===), base64-js does not
  while (str.length % 4 !== 0) {
    str = str + '='
  }
  return str
}

function toHex (n) {
  if (n < 16) return '0' + n.toString(16)
  return n.toString(16)
}

function utf8ToBytes (string, units) {
  units = units || Infinity
  var codePoint
  var length = string.length
  var leadSurrogate = null
  var bytes = []

  for (var i = 0; i < length; ++i) {
    codePoint = string.charCodeAt(i)

    // is surrogate component
    if (codePoint > 0xD7FF && codePoint < 0xE000) {
      // last char was a lead
      if (!leadSurrogate) {
        // no lead yet
        if (codePoint > 0xDBFF) {
          // unexpected trail
          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
          continue
        } else if (i + 1 === length) {
          // unpaired lead
          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
          continue
        }

        // valid lead
        leadSurrogate = codePoint

        continue
      }

      // 2 leads in a row
      if (codePoint < 0xDC00) {
        if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
        leadSurrogate = codePoint
        continue
      }

      // valid surrogate pair
      codePoint = (leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00) + 0x10000
    } else if (leadSurrogate) {
      // valid bmp char, but last char was a lead
      if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)
    }

    leadSurrogate = null

    // encode utf8
    if (codePoint < 0x80) {
      if ((units -= 1) < 0) break
      bytes.push(codePoint)
    } else if (codePoint < 0x800) {
      if ((units -= 2) < 0) break
      bytes.push(
        codePoint >> 0x6 | 0xC0,
        codePoint & 0x3F | 0x80
      )
    } else if (codePoint < 0x10000) {
      if ((units -= 3) < 0) break
      bytes.push(
        codePoint >> 0xC | 0xE0,
        codePoint >> 0x6 & 0x3F | 0x80,
        codePoint & 0x3F | 0x80
      )
    } else if (codePoint < 0x110000) {
      if ((units -= 4) < 0) break
      bytes.push(
        codePoint >> 0x12 | 0xF0,
        codePoint >> 0xC & 0x3F | 0x80,
        codePoint >> 0x6 & 0x3F | 0x80,
        codePoint & 0x3F | 0x80
      )
    } else {
      throw new Error('Invalid code point')
    }
  }

  return bytes
}

function asciiToBytes (str) {
  var byteArray = []
  for (var i = 0; i < str.length; ++i) {
    // Node's code seems to be doing this and not & 0x7F..
    byteArray.push(str.charCodeAt(i) & 0xFF)
  }
  return byteArray
}

function utf16leToBytes (str, units) {
  var c, hi, lo
  var byteArray = []
  for (var i = 0; i < str.length; ++i) {
    if ((units -= 2) < 0) break

    c = str.charCodeAt(i)
    hi = c >> 8
    lo = c % 256
    byteArray.push(lo)
    byteArray.push(hi)
  }

  return byteArray
}

function base64ToBytes (str) {
  return base64.toByteArray(base64clean(str))
}

function blitBuffer (src, dst, offset, length) {
  for (var i = 0; i < length; ++i) {
    if ((i + offset >= dst.length) || (i >= src.length)) break
    dst[i + offset] = src[i]
  }
  return i
}

// ArrayBuffers from another context (i.e. an iframe) do not pass the `instanceof` check
// but they should be treated as valid. See: https://github.com/feross/buffer/issues/166
function isArrayBuffer (obj) {
  return obj instanceof ArrayBuffer ||
    (obj != null && obj.constructor != null && obj.constructor.name === 'ArrayBuffer' &&
      typeof obj.byteLength === 'number')
}

// Node 0.10 supports `ArrayBuffer` but lacks `ArrayBuffer.isView`
function isArrayBufferView (obj) {
  return (typeof ArrayBuffer.isView === 'function') && ArrayBuffer.isView(obj)
}

function numberIsNaN (obj) {
  return obj !== obj // eslint-disable-line no-self-compare
}

},{"base64-js":73,"ieee754":78}],76:[function(require,module,exports){
(function (Buffer){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

// NOTE: These type checking functions intentionally don't use `instanceof`
// because it is fragile and can be easily faked with `Object.create()`.

function isArray(arg) {
  if (Array.isArray) {
    return Array.isArray(arg);
  }
  return objectToString(arg) === '[object Array]';
}
exports.isArray = isArray;

function isBoolean(arg) {
  return typeof arg === 'boolean';
}
exports.isBoolean = isBoolean;

function isNull(arg) {
  return arg === null;
}
exports.isNull = isNull;

function isNullOrUndefined(arg) {
  return arg == null;
}
exports.isNullOrUndefined = isNullOrUndefined;

function isNumber(arg) {
  return typeof arg === 'number';
}
exports.isNumber = isNumber;

function isString(arg) {
  return typeof arg === 'string';
}
exports.isString = isString;

function isSymbol(arg) {
  return typeof arg === 'symbol';
}
exports.isSymbol = isSymbol;

function isUndefined(arg) {
  return arg === void 0;
}
exports.isUndefined = isUndefined;

function isRegExp(re) {
  return objectToString(re) === '[object RegExp]';
}
exports.isRegExp = isRegExp;

function isObject(arg) {
  return typeof arg === 'object' && arg !== null;
}
exports.isObject = isObject;

function isDate(d) {
  return objectToString(d) === '[object Date]';
}
exports.isDate = isDate;

function isError(e) {
  return (objectToString(e) === '[object Error]' || e instanceof Error);
}
exports.isError = isError;

function isFunction(arg) {
  return typeof arg === 'function';
}
exports.isFunction = isFunction;

function isPrimitive(arg) {
  return arg === null ||
         typeof arg === 'boolean' ||
         typeof arg === 'number' ||
         typeof arg === 'string' ||
         typeof arg === 'symbol' ||  // ES6 symbol
         typeof arg === 'undefined';
}
exports.isPrimitive = isPrimitive;

exports.isBuffer = Buffer.isBuffer;

function objectToString(o) {
  return Object.prototype.toString.call(o);
}

}).call(this,{"isBuffer":require("../../is-buffer/index.js")})
},{"../../is-buffer/index.js":80}],77:[function(require,module,exports){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

function EventEmitter() {
  this._events = this._events || {};
  this._maxListeners = this._maxListeners || undefined;
}
module.exports = EventEmitter;

// Backwards-compat with node 0.10.x
EventEmitter.EventEmitter = EventEmitter;

EventEmitter.prototype._events = undefined;
EventEmitter.prototype._maxListeners = undefined;

// By default EventEmitters will print a warning if more than 10 listeners are
// added to it. This is a useful default which helps finding memory leaks.
EventEmitter.defaultMaxListeners = 10;

// Obviously not all Emitters should be limited to 10. This function allows
// that to be increased. Set to zero for unlimited.
EventEmitter.prototype.setMaxListeners = function(n) {
  if (!isNumber(n) || n < 0 || isNaN(n))
    throw TypeError('n must be a positive number');
  this._maxListeners = n;
  return this;
};

EventEmitter.prototype.emit = function(type) {
  var er, handler, len, args, i, listeners;

  if (!this._events)
    this._events = {};

  // If there is no 'error' event listener then throw.
  if (type === 'error') {
    if (!this._events.error ||
        (isObject(this._events.error) && !this._events.error.length)) {
      er = arguments[1];
      if (er instanceof Error) {
        throw er; // Unhandled 'error' event
      } else {
        // At least give some kind of context to the user
        var err = new Error('Uncaught, unspecified "error" event. (' + er + ')');
        err.context = er;
        throw err;
      }
    }
  }

  handler = this._events[type];

  if (isUndefined(handler))
    return false;

  if (isFunction(handler)) {
    switch (arguments.length) {
      // fast cases
      case 1:
        handler.call(this);
        break;
      case 2:
        handler.call(this, arguments[1]);
        break;
      case 3:
        handler.call(this, arguments[1], arguments[2]);
        break;
      // slower
      default:
        args = Array.prototype.slice.call(arguments, 1);
        handler.apply(this, args);
    }
  } else if (isObject(handler)) {
    args = Array.prototype.slice.call(arguments, 1);
    listeners = handler.slice();
    len = listeners.length;
    for (i = 0; i < len; i++)
      listeners[i].apply(this, args);
  }

  return true;
};

EventEmitter.prototype.addListener = function(type, listener) {
  var m;

  if (!isFunction(listener))
    throw TypeError('listener must be a function');

  if (!this._events)
    this._events = {};

  // To avoid recursion in the case that type === "newListener"! Before
  // adding it to the listeners, first emit "newListener".
  if (this._events.newListener)
    this.emit('newListener', type,
              isFunction(listener.listener) ?
              listener.listener : listener);

  if (!this._events[type])
    // Optimize the case of one listener. Don't need the extra array object.
    this._events[type] = listener;
  else if (isObject(this._events[type]))
    // If we've already got an array, just append.
    this._events[type].push(listener);
  else
    // Adding the second element, need to change to array.
    this._events[type] = [this._events[type], listener];

  // Check for listener leak
  if (isObject(this._events[type]) && !this._events[type].warned) {
    if (!isUndefined(this._maxListeners)) {
      m = this._maxListeners;
    } else {
      m = EventEmitter.defaultMaxListeners;
    }

    if (m && m > 0 && this._events[type].length > m) {
      this._events[type].warned = true;
      console.error('(node) warning: possible EventEmitter memory ' +
                    'leak detected. %d listeners added. ' +
                    'Use emitter.setMaxListeners() to increase limit.',
                    this._events[type].length);
      if (typeof console.trace === 'function') {
        // not supported in IE 10
        console.trace();
      }
    }
  }

  return this;
};

EventEmitter.prototype.on = EventEmitter.prototype.addListener;

EventEmitter.prototype.once = function(type, listener) {
  if (!isFunction(listener))
    throw TypeError('listener must be a function');

  var fired = false;

  function g() {
    this.removeListener(type, g);

    if (!fired) {
      fired = true;
      listener.apply(this, arguments);
    }
  }

  g.listener = listener;
  this.on(type, g);

  return this;
};

// emits a 'removeListener' event iff the listener was removed
EventEmitter.prototype.removeListener = function(type, listener) {
  var list, position, length, i;

  if (!isFunction(listener))
    throw TypeError('listener must be a function');

  if (!this._events || !this._events[type])
    return this;

  list = this._events[type];
  length = list.length;
  position = -1;

  if (list === listener ||
      (isFunction(list.listener) && list.listener === listener)) {
    delete this._events[type];
    if (this._events.removeListener)
      this.emit('removeListener', type, listener);

  } else if (isObject(list)) {
    for (i = length; i-- > 0;) {
      if (list[i] === listener ||
          (list[i].listener && list[i].listener === listener)) {
        position = i;
        break;
      }
    }

    if (position < 0)
      return this;

    if (list.length === 1) {
      list.length = 0;
      delete this._events[type];
    } else {
      list.splice(position, 1);
    }

    if (this._events.removeListener)
      this.emit('removeListener', type, listener);
  }

  return this;
};

EventEmitter.prototype.removeAllListeners = function(type) {
  var key, listeners;

  if (!this._events)
    return this;

  // not listening for removeListener, no need to emit
  if (!this._events.removeListener) {
    if (arguments.length === 0)
      this._events = {};
    else if (this._events[type])
      delete this._events[type];
    return this;
  }

  // emit removeListener for all listeners on all events
  if (arguments.length === 0) {
    for (key in this._events) {
      if (key === 'removeListener') continue;
      this.removeAllListeners(key);
    }
    this.removeAllListeners('removeListener');
    this._events = {};
    return this;
  }

  listeners = this._events[type];

  if (isFunction(listeners)) {
    this.removeListener(type, listeners);
  } else if (listeners) {
    // LIFO order
    while (listeners.length)
      this.removeListener(type, listeners[listeners.length - 1]);
  }
  delete this._events[type];

  return this;
};

EventEmitter.prototype.listeners = function(type) {
  var ret;
  if (!this._events || !this._events[type])
    ret = [];
  else if (isFunction(this._events[type]))
    ret = [this._events[type]];
  else
    ret = this._events[type].slice();
  return ret;
};

EventEmitter.prototype.listenerCount = function(type) {
  if (this._events) {
    var evlistener = this._events[type];

    if (isFunction(evlistener))
      return 1;
    else if (evlistener)
      return evlistener.length;
  }
  return 0;
};

EventEmitter.listenerCount = function(emitter, type) {
  return emitter.listenerCount(type);
};

function isFunction(arg) {
  return typeof arg === 'function';
}

function isNumber(arg) {
  return typeof arg === 'number';
}

function isObject(arg) {
  return typeof arg === 'object' && arg !== null;
}

function isUndefined(arg) {
  return arg === void 0;
}

},{}],78:[function(require,module,exports){
exports.read = function (buffer, offset, isLE, mLen, nBytes) {
  var e, m
  var eLen = nBytes * 8 - mLen - 1
  var eMax = (1 << eLen) - 1
  var eBias = eMax >> 1
  var nBits = -7
  var i = isLE ? (nBytes - 1) : 0
  var d = isLE ? -1 : 1
  var s = buffer[offset + i]

  i += d

  e = s & ((1 << (-nBits)) - 1)
  s >>= (-nBits)
  nBits += eLen
  for (; nBits > 0; e = e * 256 + buffer[offset + i], i += d, nBits -= 8) {}

  m = e & ((1 << (-nBits)) - 1)
  e >>= (-nBits)
  nBits += mLen
  for (; nBits > 0; m = m * 256 + buffer[offset + i], i += d, nBits -= 8) {}

  if (e === 0) {
    e = 1 - eBias
  } else if (e === eMax) {
    return m ? NaN : ((s ? -1 : 1) * Infinity)
  } else {
    m = m + Math.pow(2, mLen)
    e = e - eBias
  }
  return (s ? -1 : 1) * m * Math.pow(2, e - mLen)
}

exports.write = function (buffer, value, offset, isLE, mLen, nBytes) {
  var e, m, c
  var eLen = nBytes * 8 - mLen - 1
  var eMax = (1 << eLen) - 1
  var eBias = eMax >> 1
  var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0)
  var i = isLE ? 0 : (nBytes - 1)
  var d = isLE ? 1 : -1
  var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0

  value = Math.abs(value)

  if (isNaN(value) || value === Infinity) {
    m = isNaN(value) ? 1 : 0
    e = eMax
  } else {
    e = Math.floor(Math.log(value) / Math.LN2)
    if (value * (c = Math.pow(2, -e)) < 1) {
      e--
      c *= 2
    }
    if (e + eBias >= 1) {
      value += rt / c
    } else {
      value += rt * Math.pow(2, 1 - eBias)
    }
    if (value * c >= 2) {
      e++
      c /= 2
    }

    if (e + eBias >= eMax) {
      m = 0
      e = eMax
    } else if (e + eBias >= 1) {
      m = (value * c - 1) * Math.pow(2, mLen)
      e = e + eBias
    } else {
      m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen)
      e = 0
    }
  }

  for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}

  e = (e << mLen) | m
  eLen += mLen
  for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}

  buffer[offset + i - d] |= s * 128
}

},{}],79:[function(require,module,exports){
if (typeof Object.create === 'function') {
  // implementation from standard node.js 'util' module
  module.exports = function inherits(ctor, superCtor) {
    ctor.super_ = superCtor
    ctor.prototype = Object.create(superCtor.prototype, {
      constructor: {
        value: ctor,
        enumerable: false,
        writable: true,
        configurable: true
      }
    });
  };
} else {
  // old school shim for old browsers
  module.exports = function inherits(ctor, superCtor) {
    ctor.super_ = superCtor
    var TempCtor = function () {}
    TempCtor.prototype = superCtor.prototype
    ctor.prototype = new TempCtor()
    ctor.prototype.constructor = ctor
  }
}

},{}],80:[function(require,module,exports){
/*!
 * Determine if an object is a Buffer
 *
 * @author   Feross Aboukhadijeh <https://feross.org>
 * @license  MIT
 */

// The _isBuffer check is for Safari 5-7 support, because it's missing
// Object.prototype.constructor. Remove this eventually
module.exports = function (obj) {
  return obj != null && (isBuffer(obj) || isSlowBuffer(obj) || !!obj._isBuffer)
}

function isBuffer (obj) {
  return !!obj.constructor && typeof obj.constructor.isBuffer === 'function' && obj.constructor.isBuffer(obj)
}

// For Node v0.10 support. Remove this eventually.
function isSlowBuffer (obj) {
  return typeof obj.readFloatLE === 'function' && typeof obj.slice === 'function' && isBuffer(obj.slice(0, 0))
}

},{}],81:[function(require,module,exports){
var toString = {}.toString;

module.exports = Array.isArray || function (arr) {
  return toString.call(arr) == '[object Array]';
};

},{}],82:[function(require,module,exports){
(function (process){
'use strict';

if (!process.version ||
    process.version.indexOf('v0.') === 0 ||
    process.version.indexOf('v1.') === 0 && process.version.indexOf('v1.8.') !== 0) {
  module.exports = nextTick;
} else {
  module.exports = process.nextTick;
}

function nextTick(fn, arg1, arg2, arg3) {
  if (typeof fn !== 'function') {
    throw new TypeError('"callback" argument must be a function');
  }
  var len = arguments.length;
  var args, i;
  switch (len) {
  case 0:
  case 1:
    return process.nextTick(fn);
  case 2:
    return process.nextTick(function afterTickOne() {
      fn.call(null, arg1);
    });
  case 3:
    return process.nextTick(function afterTickTwo() {
      fn.call(null, arg1, arg2);
    });
  case 4:
    return process.nextTick(function afterTickThree() {
      fn.call(null, arg1, arg2, arg3);
    });
  default:
    args = new Array(len - 1);
    i = 0;
    while (i < args.length) {
      args[i++] = arguments[i];
    }
    return process.nextTick(function afterTick() {
      fn.apply(null, args);
    });
  }
}

}).call(this,require('_process'))
},{"_process":83}],83:[function(require,module,exports){
// shim for using process in browser
var process = module.exports = {};

// cached from whatever global is present so that test runners that stub it
// don't break things.  But we need to wrap it in a try catch in case it is
// wrapped in strict mode code which doesn't define any globals.  It's inside a
// function because try/catches deoptimize in certain engines.

var cachedSetTimeout;
var cachedClearTimeout;

function defaultSetTimout() {
    throw new Error('setTimeout has not been defined');
}
function defaultClearTimeout () {
    throw new Error('clearTimeout has not been defined');
}
(function () {
    try {
        if (typeof setTimeout === 'function') {
            cachedSetTimeout = setTimeout;
        } else {
            cachedSetTimeout = defaultSetTimout;
        }
    } catch (e) {
        cachedSetTimeout = defaultSetTimout;
    }
    try {
        if (typeof clearTimeout === 'function') {
            cachedClearTimeout = clearTimeout;
        } else {
            cachedClearTimeout = defaultClearTimeout;
        }
    } catch (e) {
        cachedClearTimeout = defaultClearTimeout;
    }
} ())
function runTimeout(fun) {
    if (cachedSetTimeout === setTimeout) {
        //normal enviroments in sane situations
        return setTimeout(fun, 0);
    }
    // if setTimeout wasn't available but was latter defined
    if ((cachedSetTimeout === defaultSetTimout || !cachedSetTimeout) && setTimeout) {
        cachedSetTimeout = setTimeout;
        return setTimeout(fun, 0);
    }
    try {
        // when when somebody has screwed with setTimeout but no I.E. maddness
        return cachedSetTimeout(fun, 0);
    } catch(e){
        try {
            // When we are in I.E. but the script has been evaled so I.E. doesn't trust the global object when called normally
            return cachedSetTimeout.call(null, fun, 0);
        } catch(e){
            // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error
            return cachedSetTimeout.call(this, fun, 0);
        }
    }


}
function runClearTimeout(marker) {
    if (cachedClearTimeout === clearTimeout) {
        //normal enviroments in sane situations
        return clearTimeout(marker);
    }
    // if clearTimeout wasn't available but was latter defined
    if ((cachedClearTimeout === defaultClearTimeout || !cachedClearTimeout) && clearTimeout) {
        cachedClearTimeout = clearTimeout;
        return clearTimeout(marker);
    }
    try {
        // when when somebody has screwed with setTimeout but no I.E. maddness
        return cachedClearTimeout(marker);
    } catch (e){
        try {
            // When we are in I.E. but the script has been evaled so I.E. doesn't  trust the global object when called normally
            return cachedClearTimeout.call(null, marker);
        } catch (e){
            // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error.
            // Some versions of I.E. have different rules for clearTimeout vs setTimeout
            return cachedClearTimeout.call(this, marker);
        }
    }



}
var queue = [];
var draining = false;
var currentQueue;
var queueIndex = -1;

function cleanUpNextTick() {
    if (!draining || !currentQueue) {
        return;
    }
    draining = false;
    if (currentQueue.length) {
        queue = currentQueue.concat(queue);
    } else {
        queueIndex = -1;
    }
    if (queue.length) {
        drainQueue();
    }
}

function drainQueue() {
    if (draining) {
        return;
    }
    var timeout = runTimeout(cleanUpNextTick);
    draining = true;

    var len = queue.length;
    while(len) {
        currentQueue = queue;
        queue = [];
        while (++queueIndex < len) {
            if (currentQueue) {
                currentQueue[queueIndex].run();
            }
        }
        queueIndex = -1;
        len = queue.length;
    }
    currentQueue = null;
    draining = false;
    runClearTimeout(timeout);
}

process.nextTick = function (fun) {
    var args = new Array(arguments.length - 1);
    if (arguments.length > 1) {
        for (var i = 1; i < arguments.length; i++) {
            args[i - 1] = arguments[i];
        }
    }
    queue.push(new Item(fun, args));
    if (queue.length === 1 && !draining) {
        runTimeout(drainQueue);
    }
};

// v8 likes predictible objects
function Item(fun, array) {
    this.fun = fun;
    this.array = array;
}
Item.prototype.run = function () {
    this.fun.apply(null, this.array);
};
process.title = 'browser';
process.browser = true;
process.env = {};
process.argv = [];
process.version = ''; // empty string to avoid regexp issues
process.versions = {};

function noop() {}

process.on = noop;
process.addListener = noop;
process.once = noop;
process.off = noop;
process.removeListener = noop;
process.removeAllListeners = noop;
process.emit = noop;
process.prependListener = noop;
process.prependOnceListener = noop;

process.listeners = function (name) { return [] }

process.binding = function (name) {
    throw new Error('process.binding is not supported');
};

process.cwd = function () { return '/' };
process.chdir = function (dir) {
    throw new Error('process.chdir is not supported');
};
process.umask = function() { return 0; };

},{}],84:[function(require,module,exports){
module.exports = require('./lib/_stream_duplex.js');

},{"./lib/_stream_duplex.js":85}],85:[function(require,module,exports){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

// a duplex stream is just a stream that is both readable and writable.
// Since JS doesn't have multiple prototypal inheritance, this class
// prototypally inherits from Readable, and then parasitically from
// Writable.

'use strict';

/*<replacement>*/

var processNextTick = require('process-nextick-args');
/*</replacement>*/

/*<replacement>*/
var objectKeys = Object.keys || function (obj) {
  var keys = [];
  for (var key in obj) {
    keys.push(key);
  }return keys;
};
/*</replacement>*/

module.exports = Duplex;

/*<replacement>*/
var util = require('core-util-is');
util.inherits = require('inherits');
/*</replacement>*/

var Readable = require('./_stream_readable');
var Writable = require('./_stream_writable');

util.inherits(Duplex, Readable);

var keys = objectKeys(Writable.prototype);
for (var v = 0; v < keys.length; v++) {
  var method = keys[v];
  if (!Duplex.prototype[method]) Duplex.prototype[method] = Writable.prototype[method];
}

function Duplex(options) {
  if (!(this instanceof Duplex)) return new Duplex(options);

  Readable.call(this, options);
  Writable.call(this, options);

  if (options && options.readable === false) this.readable = false;

  if (options && options.writable === false) this.writable = false;

  this.allowHalfOpen = true;
  if (options && options.allowHalfOpen === false) this.allowHalfOpen = false;

  this.once('end', onend);
}

// the no-half-open enforcer
function onend() {
  // if we allow half-open state, or if the writable side ended,
  // then we're ok.
  if (this.allowHalfOpen || this._writableState.ended) return;

  // no more data can be written.
  // But allow more writes to happen in this tick.
  processNextTick(onEndNT, this);
}

function onEndNT(self) {
  self.end();
}

Object.defineProperty(Duplex.prototype, 'destroyed', {
  get: function () {
    if (this._readableState === undefined || this._writableState === undefined) {
      return false;
    }
    return this._readableState.destroyed && this._writableState.destroyed;
  },
  set: function (value) {
    // we ignore the value if the stream
    // has not been initialized yet
    if (this._readableState === undefined || this._writableState === undefined) {
      return;
    }

    // backward compatibility, the user is explicitly
    // managing destroyed
    this._readableState.destroyed = value;
    this._writableState.destroyed = value;
  }
});

Duplex.prototype._destroy = function (err, cb) {
  this.push(null);
  this.end();

  processNextTick(cb, err);
};

function forEach(xs, f) {
  for (var i = 0, l = xs.length; i < l; i++) {
    f(xs[i], i);
  }
}
},{"./_stream_readable":87,"./_stream_writable":89,"core-util-is":76,"inherits":79,"process-nextick-args":82}],86:[function(require,module,exports){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

// a passthrough stream.
// basically just the most minimal sort of Transform stream.
// Every written chunk gets output as-is.

'use strict';

module.exports = PassThrough;

var Transform = require('./_stream_transform');

/*<replacement>*/
var util = require('core-util-is');
util.inherits = require('inherits');
/*</replacement>*/

util.inherits(PassThrough, Transform);

function PassThrough(options) {
  if (!(this instanceof PassThrough)) return new PassThrough(options);

  Transform.call(this, options);
}

PassThrough.prototype._transform = function (chunk, encoding, cb) {
  cb(null, chunk);
};
},{"./_stream_transform":88,"core-util-is":76,"inherits":79}],87:[function(require,module,exports){
(function (process,global){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

'use strict';

/*<replacement>*/

var processNextTick = require('process-nextick-args');
/*</replacement>*/

module.exports = Readable;

/*<replacement>*/
var isArray = require('isarray');
/*</replacement>*/

/*<replacement>*/
var Duplex;
/*</replacement>*/

Readable.ReadableState = ReadableState;

/*<replacement>*/
var EE = require('events').EventEmitter;

var EElistenerCount = function (emitter, type) {
  return emitter.listeners(type).length;
};
/*</replacement>*/

/*<replacement>*/
var Stream = require('./internal/streams/stream');
/*</replacement>*/

// TODO(bmeurer): Change this back to const once hole checks are
// properly optimized away early in Ignition+TurboFan.
/*<replacement>*/
var Buffer = require('safe-buffer').Buffer;
var OurUint8Array = global.Uint8Array || function () {};
function _uint8ArrayToBuffer(chunk) {
  return Buffer.from(chunk);
}
function _isUint8Array(obj) {
  return Buffer.isBuffer(obj) || obj instanceof OurUint8Array;
}
/*</replacement>*/

/*<replacement>*/
var util = require('core-util-is');
util.inherits = require('inherits');
/*</replacement>*/

/*<replacement>*/
var debugUtil = require('util');
var debug = void 0;
if (debugUtil && debugUtil.debuglog) {
  debug = debugUtil.debuglog('stream');
} else {
  debug = function () {};
}
/*</replacement>*/

var BufferList = require('./internal/streams/BufferList');
var destroyImpl = require('./internal/streams/destroy');
var StringDecoder;

util.inherits(Readable, Stream);

var kProxyEvents = ['error', 'close', 'destroy', 'pause', 'resume'];

function prependListener(emitter, event, fn) {
  // Sadly this is not cacheable as some libraries bundle their own
  // event emitter implementation with them.
  if (typeof emitter.prependListener === 'function') {
    return emitter.prependListener(event, fn);
  } else {
    // This is a hack to make sure that our error handler is attached before any
    // userland ones.  NEVER DO THIS. This is here only because this code needs
    // to continue to work with older versions of Node.js that do not include
    // the prependListener() method. The goal is to eventually remove this hack.
    if (!emitter._events || !emitter._events[event]) emitter.on(event, fn);else if (isArray(emitter._events[event])) emitter._events[event].unshift(fn);else emitter._events[event] = [fn, emitter._events[event]];
  }
}

function ReadableState(options, stream) {
  Duplex = Duplex || require('./_stream_duplex');

  options = options || {};

  // object stream flag. Used to make read(n) ignore n and to
  // make all the buffer merging and length checks go away
  this.objectMode = !!options.objectMode;

  if (stream instanceof Duplex) this.objectMode = this.objectMode || !!options.readableObjectMode;

  // the point at which it stops calling _read() to fill the buffer
  // Note: 0 is a valid value, means "don't call _read preemptively ever"
  var hwm = options.highWaterMark;
  var defaultHwm = this.objectMode ? 16 : 16 * 1024;
  this.highWaterMark = hwm || hwm === 0 ? hwm : defaultHwm;

  // cast to ints.
  this.highWaterMark = Math.floor(this.highWaterMark);

  // A linked list is used to store data chunks instead of an array because the
  // linked list can remove elements from the beginning faster than
  // array.shift()
  this.buffer = new BufferList();
  this.length = 0;
  this.pipes = null;
  this.pipesCount = 0;
  this.flowing = null;
  this.ended = false;
  this.endEmitted = false;
  this.reading = false;

  // a flag to be able to tell if the event 'readable'/'data' is emitted
  // immediately, or on a later tick.  We set this to true at first, because
  // any actions that shouldn't happen until "later" should generally also
  // not happen before the first read call.
  this.sync = true;

  // whenever we return null, then we set a flag to say
  // that we're awaiting a 'readable' event emission.
  this.needReadable = false;
  this.emittedReadable = false;
  this.readableListening = false;
  this.resumeScheduled = false;

  // has it been destroyed
  this.destroyed = false;

  // Crypto is kind of old and crusty.  Historically, its default string
  // encoding is 'binary' so we have to make this configurable.
  // Everything else in the universe uses 'utf8', though.
  this.defaultEncoding = options.defaultEncoding || 'utf8';

  // the number of writers that are awaiting a drain event in .pipe()s
  this.awaitDrain = 0;

  // if true, a maybeReadMore has been scheduled
  this.readingMore = false;

  this.decoder = null;
  this.encoding = null;
  if (options.encoding) {
    if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;
    this.decoder = new StringDecoder(options.encoding);
    this.encoding = options.encoding;
  }
}

function Readable(options) {
  Duplex = Duplex || require('./_stream_duplex');

  if (!(this instanceof Readable)) return new Readable(options);

  this._readableState = new ReadableState(options, this);

  // legacy
  this.readable = true;

  if (options) {
    if (typeof options.read === 'function') this._read = options.read;

    if (typeof options.destroy === 'function') this._destroy = options.destroy;
  }

  Stream.call(this);
}

Object.defineProperty(Readable.prototype, 'destroyed', {
  get: function () {
    if (this._readableState === undefined) {
      return false;
    }
    return this._readableState.destroyed;
  },
  set: function (value) {
    // we ignore the value if the stream
    // has not been initialized yet
    if (!this._readableState) {
      return;
    }

    // backward compatibility, the user is explicitly
    // managing destroyed
    this._readableState.destroyed = value;
  }
});

Readable.prototype.destroy = destroyImpl.destroy;
Readable.prototype._undestroy = destroyImpl.undestroy;
Readable.prototype._destroy = function (err, cb) {
  this.push(null);
  cb(err);
};

// Manually shove something into the read() buffer.
// This returns true if the highWaterMark has not been hit yet,
// similar to how Writable.write() returns true if you should
// write() some more.
Readable.prototype.push = function (chunk, encoding) {
  var state = this._readableState;
  var skipChunkCheck;

  if (!state.objectMode) {
    if (typeof chunk === 'string') {
      encoding = encoding || state.defaultEncoding;
      if (encoding !== state.encoding) {
        chunk = Buffer.from(chunk, encoding);
        encoding = '';
      }
      skipChunkCheck = true;
    }
  } else {
    skipChunkCheck = true;
  }

  return readableAddChunk(this, chunk, encoding, false, skipChunkCheck);
};

// Unshift should *always* be something directly out of read()
Readable.prototype.unshift = function (chunk) {
  return readableAddChunk(this, chunk, null, true, false);
};

function readableAddChunk(stream, chunk, encoding, addToFront, skipChunkCheck) {
  var state = stream._readableState;
  if (chunk === null) {
    state.reading = false;
    onEofChunk(stream, state);
  } else {
    var er;
    if (!skipChunkCheck) er = chunkInvalid(state, chunk);
    if (er) {
      stream.emit('error', er);
    } else if (state.objectMode || chunk && chunk.length > 0) {
      if (typeof chunk !== 'string' && !state.objectMode && Object.getPrototypeOf(chunk) !== Buffer.prototype) {
        chunk = _uint8ArrayToBuffer(chunk);
      }

      if (addToFront) {
        if (state.endEmitted) stream.emit('error', new Error('stream.unshift() after end event'));else addChunk(stream, state, chunk, true);
      } else if (state.ended) {
        stream.emit('error', new Error('stream.push() after EOF'));
      } else {
        state.reading = false;
        if (state.decoder && !encoding) {
          chunk = state.decoder.write(chunk);
          if (state.objectMode || chunk.length !== 0) addChunk(stream, state, chunk, false);else maybeReadMore(stream, state);
        } else {
          addChunk(stream, state, chunk, false);
        }
      }
    } else if (!addToFront) {
      state.reading = false;
    }
  }

  return needMoreData(state);
}

function addChunk(stream, state, chunk, addToFront) {
  if (state.flowing && state.length === 0 && !state.sync) {
    stream.emit('data', chunk);
    stream.read(0);
  } else {
    // update the buffer info.
    state.length += state.objectMode ? 1 : chunk.length;
    if (addToFront) state.buffer.unshift(chunk);else state.buffer.push(chunk);

    if (state.needReadable) emitReadable(stream);
  }
  maybeReadMore(stream, state);
}

function chunkInvalid(state, chunk) {
  var er;
  if (!_isUint8Array(chunk) && typeof chunk !== 'string' && chunk !== undefined && !state.objectMode) {
    er = new TypeError('Invalid non-string/buffer chunk');
  }
  return er;
}

// if it's past the high water mark, we can push in some more.
// Also, if we have no data yet, we can stand some
// more bytes.  This is to work around cases where hwm=0,
// such as the repl.  Also, if the push() triggered a
// readable event, and the user called read(largeNumber) such that
// needReadable was set, then we ought to push more, so that another
// 'readable' event will be triggered.
function needMoreData(state) {
  return !state.ended && (state.needReadable || state.length < state.highWaterMark || state.length === 0);
}

Readable.prototype.isPaused = function () {
  return this._readableState.flowing === false;
};

// backwards compatibility.
Readable.prototype.setEncoding = function (enc) {
  if (!StringDecoder) StringDecoder = require('string_decoder/').StringDecoder;
  this._readableState.decoder = new StringDecoder(enc);
  this._readableState.encoding = enc;
  return this;
};

// Don't raise the hwm > 8MB
var MAX_HWM = 0x800000;
function computeNewHighWaterMark(n) {
  if (n >= MAX_HWM) {
    n = MAX_HWM;
  } else {
    // Get the next highest power of 2 to prevent increasing hwm excessively in
    // tiny amounts
    n--;
    n |= n >>> 1;
    n |= n >>> 2;
    n |= n >>> 4;
    n |= n >>> 8;
    n |= n >>> 16;
    n++;
  }
  return n;
}

// This function is designed to be inlinable, so please take care when making
// changes to the function body.
function howMuchToRead(n, state) {
  if (n <= 0 || state.length === 0 && state.ended) return 0;
  if (state.objectMode) return 1;
  if (n !== n) {
    // Only flow one buffer at a time
    if (state.flowing && state.length) return state.buffer.head.data.length;else return state.length;
  }
  // If we're asking for more than the current hwm, then raise the hwm.
  if (n > state.highWaterMark) state.highWaterMark = computeNewHighWaterMark(n);
  if (n <= state.length) return n;
  // Don't have enough
  if (!state.ended) {
    state.needReadable = true;
    return 0;
  }
  return state.length;
}

// you can override either this method, or the async _read(n) below.
Readable.prototype.read = function (n) {
  debug('read', n);
  n = parseInt(n, 10);
  var state = this._readableState;
  var nOrig = n;

  if (n !== 0) state.emittedReadable = false;

  // if we're doing read(0) to trigger a readable event, but we
  // already have a bunch of data in the buffer, then just trigger
  // the 'readable' event and move on.
  if (n === 0 && state.needReadable && (state.length >= state.highWaterMark || state.ended)) {
    debug('read: emitReadable', state.length, state.ended);
    if (state.length === 0 && state.ended) endReadable(this);else emitReadable(this);
    return null;
  }

  n = howMuchToRead(n, state);

  // if we've ended, and we're now clear, then finish it up.
  if (n === 0 && state.ended) {
    if (state.length === 0) endReadable(this);
    return null;
  }

  // All the actual chunk generation logic needs to be
  // *below* the call to _read.  The reason is that in certain
  // synthetic stream cases, such as passthrough streams, _read
  // may be a completely synchronous operation which may change
  // the state of the read buffer, providing enough data when
  // before there was *not* enough.
  //
  // So, the steps are:
  // 1. Figure out what the state of things will be after we do
  // a read from the buffer.
  //
  // 2. If that resulting state will trigger a _read, then call _read.
  // Note that this may be asynchronous, or synchronous.  Yes, it is
  // deeply ugly to write APIs this way, but that still doesn't mean
  // that the Readable class should behave improperly, as streams are
  // designed to be sync/async agnostic.
  // Take note if the _read call is sync or async (ie, if the read call
  // has returned yet), so that we know whether or not it's safe to emit
  // 'readable' etc.
  //
  // 3. Actually pull the requested chunks out of the buffer and return.

  // if we need a readable event, then we need to do some reading.
  var doRead = state.needReadable;
  debug('need readable', doRead);

  // if we currently have less than the highWaterMark, then also read some
  if (state.length === 0 || state.length - n < state.highWaterMark) {
    doRead = true;
    debug('length less than watermark', doRead);
  }

  // however, if we've ended, then there's no point, and if we're already
  // reading, then it's unnecessary.
  if (state.ended || state.reading) {
    doRead = false;
    debug('reading or ended', doRead);
  } else if (doRead) {
    debug('do read');
    state.reading = true;
    state.sync = true;
    // if the length is currently zero, then we *need* a readable event.
    if (state.length === 0) state.needReadable = true;
    // call internal read method
    this._read(state.highWaterMark);
    state.sync = false;
    // If _read pushed data synchronously, then `reading` will be false,
    // and we need to re-evaluate how much data we can return to the user.
    if (!state.reading) n = howMuchToRead(nOrig, state);
  }

  var ret;
  if (n > 0) ret = fromList(n, state);else ret = null;

  if (ret === null) {
    state.needReadable = true;
    n = 0;
  } else {
    state.length -= n;
  }

  if (state.length === 0) {
    // If we have nothing in the buffer, then we want to know
    // as soon as we *do* get something into the buffer.
    if (!state.ended) state.needReadable = true;

    // If we tried to read() past the EOF, then emit end on the next tick.
    if (nOrig !== n && state.ended) endReadable(this);
  }

  if (ret !== null) this.emit('data', ret);

  return ret;
};

function onEofChunk(stream, state) {
  if (state.ended) return;
  if (state.decoder) {
    var chunk = state.decoder.end();
    if (chunk && chunk.length) {
      state.buffer.push(chunk);
      state.length += state.objectMode ? 1 : chunk.length;
    }
  }
  state.ended = true;

  // emit 'readable' now to make sure it gets picked up.
  emitReadable(stream);
}

// Don't emit readable right away in sync mode, because this can trigger
// another read() call => stack overflow.  This way, it might trigger
// a nextTick recursion warning, but that's not so bad.
function emitReadable(stream) {
  var state = stream._readableState;
  state.needReadable = false;
  if (!state.emittedReadable) {
    debug('emitReadable', state.flowing);
    state.emittedReadable = true;
    if (state.sync) processNextTick(emitReadable_, stream);else emitReadable_(stream);
  }
}

function emitReadable_(stream) {
  debug('emit readable');
  stream.emit('readable');
  flow(stream);
}

// at this point, the user has presumably seen the 'readable' event,
// and called read() to consume some data.  that may have triggered
// in turn another _read(n) call, in which case reading = true if
// it's in progress.
// However, if we're not ended, or reading, and the length < hwm,
// then go ahead and try to read some more preemptively.
function maybeReadMore(stream, state) {
  if (!state.readingMore) {
    state.readingMore = true;
    processNextTick(maybeReadMore_, stream, state);
  }
}

function maybeReadMore_(stream, state) {
  var len = state.length;
  while (!state.reading && !state.flowing && !state.ended && state.length < state.highWaterMark) {
    debug('maybeReadMore read 0');
    stream.read(0);
    if (len === state.length)
      // didn't get any data, stop spinning.
      break;else len = state.length;
  }
  state.readingMore = false;
}

// abstract method.  to be overridden in specific implementation classes.
// call cb(er, data) where data is <= n in length.
// for virtual (non-string, non-buffer) streams, "length" is somewhat
// arbitrary, and perhaps not very meaningful.
Readable.prototype._read = function (n) {
  this.emit('error', new Error('_read() is not implemented'));
};

Readable.prototype.pipe = function (dest, pipeOpts) {
  var src = this;
  var state = this._readableState;

  switch (state.pipesCount) {
    case 0:
      state.pipes = dest;
      break;
    case 1:
      state.pipes = [state.pipes, dest];
      break;
    default:
      state.pipes.push(dest);
      break;
  }
  state.pipesCount += 1;
  debug('pipe count=%d opts=%j', state.pipesCount, pipeOpts);

  var doEnd = (!pipeOpts || pipeOpts.end !== false) && dest !== process.stdout && dest !== process.stderr;

  var endFn = doEnd ? onend : unpipe;
  if (state.endEmitted) processNextTick(endFn);else src.once('end', endFn);

  dest.on('unpipe', onunpipe);
  function onunpipe(readable, unpipeInfo) {
    debug('onunpipe');
    if (readable === src) {
      if (unpipeInfo && unpipeInfo.hasUnpiped === false) {
        unpipeInfo.hasUnpiped = true;
        cleanup();
      }
    }
  }

  function onend() {
    debug('onend');
    dest.end();
  }

  // when the dest drains, it reduces the awaitDrain counter
  // on the source.  This would be more elegant with a .once()
  // handler in flow(), but adding and removing repeatedly is
  // too slow.
  var ondrain = pipeOnDrain(src);
  dest.on('drain', ondrain);

  var cleanedUp = false;
  function cleanup() {
    debug('cleanup');
    // cleanup event handlers once the pipe is broken
    dest.removeListener('close', onclose);
    dest.removeListener('finish', onfinish);
    dest.removeListener('drain', ondrain);
    dest.removeListener('error', onerror);
    dest.removeListener('unpipe', onunpipe);
    src.removeListener('end', onend);
    src.removeListener('end', unpipe);
    src.removeListener('data', ondata);

    cleanedUp = true;

    // if the reader is waiting for a drain event from this
    // specific writer, then it would cause it to never start
    // flowing again.
    // So, if this is awaiting a drain, then we just call it now.
    // If we don't know, then assume that we are waiting for one.
    if (state.awaitDrain && (!dest._writableState || dest._writableState.needDrain)) ondrain();
  }

  // If the user pushes more data while we're writing to dest then we'll end up
  // in ondata again. However, we only want to increase awaitDrain once because
  // dest will only emit one 'drain' event for the multiple writes.
  // => Introduce a guard on increasing awaitDrain.
  var increasedAwaitDrain = false;
  src.on('data', ondata);
  function ondata(chunk) {
    debug('ondata');
    increasedAwaitDrain = false;
    var ret = dest.write(chunk);
    if (false === ret && !increasedAwaitDrain) {
      // If the user unpiped during `dest.write()`, it is possible
      // to get stuck in a permanently paused state if that write
      // also returned false.
      // => Check whether `dest` is still a piping destination.
      if ((state.pipesCount === 1 && state.pipes === dest || state.pipesCount > 1 && indexOf(state.pipes, dest) !== -1) && !cleanedUp) {
        debug('false write response, pause', src._readableState.awaitDrain);
        src._readableState.awaitDrain++;
        increasedAwaitDrain = true;
      }
      src.pause();
    }
  }

  // if the dest has an error, then stop piping into it.
  // however, don't suppress the throwing behavior for this.
  function onerror(er) {
    debug('onerror', er);
    unpipe();
    dest.removeListener('error', onerror);
    if (EElistenerCount(dest, 'error') === 0) dest.emit('error', er);
  }

  // Make sure our error handler is attached before userland ones.
  prependListener(dest, 'error', onerror);

  // Both close and finish should trigger unpipe, but only once.
  function onclose() {
    dest.removeListener('finish', onfinish);
    unpipe();
  }
  dest.once('close', onclose);
  function onfinish() {
    debug('onfinish');
    dest.removeListener('close', onclose);
    unpipe();
  }
  dest.once('finish', onfinish);

  function unpipe() {
    debug('unpipe');
    src.unpipe(dest);
  }

  // tell the dest that it's being piped to
  dest.emit('pipe', src);

  // start the flow if it hasn't been started already.
  if (!state.flowing) {
    debug('pipe resume');
    src.resume();
  }

  return dest;
};

function pipeOnDrain(src) {
  return function () {
    var state = src._readableState;
    debug('pipeOnDrain', state.awaitDrain);
    if (state.awaitDrain) state.awaitDrain--;
    if (state.awaitDrain === 0 && EElistenerCount(src, 'data')) {
      state.flowing = true;
      flow(src);
    }
  };
}

Readable.prototype.unpipe = function (dest) {
  var state = this._readableState;
  var unpipeInfo = { hasUnpiped: false };

  // if we're not piping anywhere, then do nothing.
  if (state.pipesCount === 0) return this;

  // just one destination.  most common case.
  if (state.pipesCount === 1) {
    // passed in one, but it's not the right one.
    if (dest && dest !== state.pipes) return this;

    if (!dest) dest = state.pipes;

    // got a match.
    state.pipes = null;
    state.pipesCount = 0;
    state.flowing = false;
    if (dest) dest.emit('unpipe', this, unpipeInfo);
    return this;
  }

  // slow case. multiple pipe destinations.

  if (!dest) {
    // remove all.
    var dests = state.pipes;
    var len = state.pipesCount;
    state.pipes = null;
    state.pipesCount = 0;
    state.flowing = false;

    for (var i = 0; i < len; i++) {
      dests[i].emit('unpipe', this, unpipeInfo);
    }return this;
  }

  // try to find the right one.
  var index = indexOf(state.pipes, dest);
  if (index === -1) return this;

  state.pipes.splice(index, 1);
  state.pipesCount -= 1;
  if (state.pipesCount === 1) state.pipes = state.pipes[0];

  dest.emit('unpipe', this, unpipeInfo);

  return this;
};

// set up data events if they are asked for
// Ensure readable listeners eventually get something
Readable.prototype.on = function (ev, fn) {
  var res = Stream.prototype.on.call(this, ev, fn);

  if (ev === 'data') {
    // Start flowing on next tick if stream isn't explicitly paused
    if (this._readableState.flowing !== false) this.resume();
  } else if (ev === 'readable') {
    var state = this._readableState;
    if (!state.endEmitted && !state.readableListening) {
      state.readableListening = state.needReadable = true;
      state.emittedReadable = false;
      if (!state.reading) {
        processNextTick(nReadingNextTick, this);
      } else if (state.length) {
        emitReadable(this);
      }
    }
  }

  return res;
};
Readable.prototype.addListener = Readable.prototype.on;

function nReadingNextTick(self) {
  debug('readable nexttick read 0');
  self.read(0);
}

// pause() and resume() are remnants of the legacy readable stream API
// If the user uses them, then switch into old mode.
Readable.prototype.resume = function () {
  var state = this._readableState;
  if (!state.flowing) {
    debug('resume');
    state.flowing = true;
    resume(this, state);
  }
  return this;
};

function resume(stream, state) {
  if (!state.resumeScheduled) {
    state.resumeScheduled = true;
    processNextTick(resume_, stream, state);
  }
}

function resume_(stream, state) {
  if (!state.reading) {
    debug('resume read 0');
    stream.read(0);
  }

  state.resumeScheduled = false;
  state.awaitDrain = 0;
  stream.emit('resume');
  flow(stream);
  if (state.flowing && !state.reading) stream.read(0);
}

Readable.prototype.pause = function () {
  debug('call pause flowing=%j', this._readableState.flowing);
  if (false !== this._readableState.flowing) {
    debug('pause');
    this._readableState.flowing = false;
    this.emit('pause');
  }
  return this;
};

function flow(stream) {
  var state = stream._readableState;
  debug('flow', state.flowing);
  while (state.flowing && stream.read() !== null) {}
}

// wrap an old-style stream as the async data source.
// This is *not* part of the readable stream interface.
// It is an ugly unfortunate mess of history.
Readable.prototype.wrap = function (stream) {
  var state = this._readableState;
  var paused = false;

  var self = this;
  stream.on('end', function () {
    debug('wrapped end');
    if (state.decoder && !state.ended) {
      var chunk = state.decoder.end();
      if (chunk && chunk.length) self.push(chunk);
    }

    self.push(null);
  });

  stream.on('data', function (chunk) {
    debug('wrapped data');
    if (state.decoder) chunk = state.decoder.write(chunk);

    // don't skip over falsy values in objectMode
    if (state.objectMode && (chunk === null || chunk === undefined)) return;else if (!state.objectMode && (!chunk || !chunk.length)) return;

    var ret = self.push(chunk);
    if (!ret) {
      paused = true;
      stream.pause();
    }
  });

  // proxy all the other methods.
  // important when wrapping filters and duplexes.
  for (var i in stream) {
    if (this[i] === undefined && typeof stream[i] === 'function') {
      this[i] = function (method) {
        return function () {
          return stream[method].apply(stream, arguments);
        };
      }(i);
    }
  }

  // proxy certain important events.
  for (var n = 0; n < kProxyEvents.length; n++) {
    stream.on(kProxyEvents[n], self.emit.bind(self, kProxyEvents[n]));
  }

  // when we try to consume some more bytes, simply unpause the
  // underlying stream.
  self._read = function (n) {
    debug('wrapped _read', n);
    if (paused) {
      paused = false;
      stream.resume();
    }
  };

  return self;
};

// exposed for testing purposes only.
Readable._fromList = fromList;

// Pluck off n bytes from an array of buffers.
// Length is the combined lengths of all the buffers in the list.
// This function is designed to be inlinable, so please take care when making
// changes to the function body.
function fromList(n, state) {
  // nothing buffered
  if (state.length === 0) return null;

  var ret;
  if (state.objectMode) ret = state.buffer.shift();else if (!n || n >= state.length) {
    // read it all, truncate the list
    if (state.decoder) ret = state.buffer.join('');else if (state.buffer.length === 1) ret = state.buffer.head.data;else ret = state.buffer.concat(state.length);
    state.buffer.clear();
  } else {
    // read part of list
    ret = fromListPartial(n, state.buffer, state.decoder);
  }

  return ret;
}

// Extracts only enough buffered data to satisfy the amount requested.
// This function is designed to be inlinable, so please take care when making
// changes to the function body.
function fromListPartial(n, list, hasStrings) {
  var ret;
  if (n < list.head.data.length) {
    // slice is the same for buffers and strings
    ret = list.head.data.slice(0, n);
    list.head.data = list.head.data.slice(n);
  } else if (n === list.head.data.length) {
    // first chunk is a perfect match
    ret = list.shift();
  } else {
    // result spans more than one buffer
    ret = hasStrings ? copyFromBufferString(n, list) : copyFromBuffer(n, list);
  }
  return ret;
}

// Copies a specified amount of characters from the list of buffered data
// chunks.
// This function is designed to be inlinable, so please take care when making
// changes to the function body.
function copyFromBufferString(n, list) {
  var p = list.head;
  var c = 1;
  var ret = p.data;
  n -= ret.length;
  while (p = p.next) {
    var str = p.data;
    var nb = n > str.length ? str.length : n;
    if (nb === str.length) ret += str;else ret += str.slice(0, n);
    n -= nb;
    if (n === 0) {
      if (nb === str.length) {
        ++c;
        if (p.next) list.head = p.next;else list.head = list.tail = null;
      } else {
        list.head = p;
        p.data = str.slice(nb);
      }
      break;
    }
    ++c;
  }
  list.length -= c;
  return ret;
}

// Copies a specified amount of bytes from the list of buffered data chunks.
// This function is designed to be inlinable, so please take care when making
// changes to the function body.
function copyFromBuffer(n, list) {
  var ret = Buffer.allocUnsafe(n);
  var p = list.head;
  var c = 1;
  p.data.copy(ret);
  n -= p.data.length;
  while (p = p.next) {
    var buf = p.data;
    var nb = n > buf.length ? buf.length : n;
    buf.copy(ret, ret.length - n, 0, nb);
    n -= nb;
    if (n === 0) {
      if (nb === buf.length) {
        ++c;
        if (p.next) list.head = p.next;else list.head = list.tail = null;
      } else {
        list.head = p;
        p.data = buf.slice(nb);
      }
      break;
    }
    ++c;
  }
  list.length -= c;
  return ret;
}

function endReadable(stream) {
  var state = stream._readableState;

  // If we get here before consuming all the bytes, then that is a
  // bug in node.  Should never happen.
  if (state.length > 0) throw new Error('"endReadable()" called on non-empty stream');

  if (!state.endEmitted) {
    state.ended = true;
    processNextTick(endReadableNT, state, stream);
  }
}

function endReadableNT(state, stream) {
  // Check that we didn't get one last unshift.
  if (!state.endEmitted && state.length === 0) {
    state.endEmitted = true;
    stream.readable = false;
    stream.emit('end');
  }
}

function forEach(xs, f) {
  for (var i = 0, l = xs.length; i < l; i++) {
    f(xs[i], i);
  }
}

function indexOf(xs, x) {
  for (var i = 0, l = xs.length; i < l; i++) {
    if (xs[i] === x) return i;
  }
  return -1;
}
}).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"./_stream_duplex":85,"./internal/streams/BufferList":90,"./internal/streams/destroy":91,"./internal/streams/stream":92,"_process":83,"core-util-is":76,"events":77,"inherits":79,"isarray":81,"process-nextick-args":82,"safe-buffer":97,"string_decoder/":99,"util":74}],88:[function(require,module,exports){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

// a transform stream is a readable/writable stream where you do
// something with the data.  Sometimes it's called a "filter",
// but that's not a great name for it, since that implies a thing where
// some bits pass through, and others are simply ignored.  (That would
// be a valid example of a transform, of course.)
//
// While the output is causally related to the input, it's not a
// necessarily symmetric or synchronous transformation.  For example,
// a zlib stream might take multiple plain-text writes(), and then
// emit a single compressed chunk some time in the future.
//
// Here's how this works:
//
// The Transform stream has all the aspects of the readable and writable
// stream classes.  When you write(chunk), that calls _write(chunk,cb)
// internally, and returns false if there's a lot of pending writes
// buffered up.  When you call read(), that calls _read(n) until
// there's enough pending readable data buffered up.
//
// In a transform stream, the written data is placed in a buffer.  When
// _read(n) is called, it transforms the queued up data, calling the
// buffered _write cb's as it consumes chunks.  If consuming a single
// written chunk would result in multiple output chunks, then the first
// outputted bit calls the readcb, and subsequent chunks just go into
// the read buffer, and will cause it to emit 'readable' if necessary.
//
// This way, back-pressure is actually determined by the reading side,
// since _read has to be called to start processing a new chunk.  However,
// a pathological inflate type of transform can cause excessive buffering
// here.  For example, imagine a stream where every byte of input is
// interpreted as an integer from 0-255, and then results in that many
// bytes of output.  Writing the 4 bytes {ff,ff,ff,ff} would result in
// 1kb of data being output.  In this case, you could write a very small
// amount of input, and end up with a very large amount of output.  In
// such a pathological inflating mechanism, there'd be no way to tell
// the system to stop doing the transform.  A single 4MB write could
// cause the system to run out of memory.
//
// However, even in such a pathological case, only a single written chunk
// would be consumed, and then the rest would wait (un-transformed) until
// the results of the previous transformed chunk were consumed.

'use strict';

module.exports = Transform;

var Duplex = require('./_stream_duplex');

/*<replacement>*/
var util = require('core-util-is');
util.inherits = require('inherits');
/*</replacement>*/

util.inherits(Transform, Duplex);

function TransformState(stream) {
  this.afterTransform = function (er, data) {
    return afterTransform(stream, er, data);
  };

  this.needTransform = false;
  this.transforming = false;
  this.writecb = null;
  this.writechunk = null;
  this.writeencoding = null;
}

function afterTransform(stream, er, data) {
  var ts = stream._transformState;
  ts.transforming = false;

  var cb = ts.writecb;

  if (!cb) {
    return stream.emit('error', new Error('write callback called multiple times'));
  }

  ts.writechunk = null;
  ts.writecb = null;

  if (data !== null && data !== undefined) stream.push(data);

  cb(er);

  var rs = stream._readableState;
  rs.reading = false;
  if (rs.needReadable || rs.length < rs.highWaterMark) {
    stream._read(rs.highWaterMark);
  }
}

function Transform(options) {
  if (!(this instanceof Transform)) return new Transform(options);

  Duplex.call(this, options);

  this._transformState = new TransformState(this);

  var stream = this;

  // start out asking for a readable event once data is transformed.
  this._readableState.needReadable = true;

  // we have implemented the _read method, and done the other things
  // that Readable wants before the first _read call, so unset the
  // sync guard flag.
  this._readableState.sync = false;

  if (options) {
    if (typeof options.transform === 'function') this._transform = options.transform;

    if (typeof options.flush === 'function') this._flush = options.flush;
  }

  // When the writable side finishes, then flush out anything remaining.
  this.once('prefinish', function () {
    if (typeof this._flush === 'function') this._flush(function (er, data) {
      done(stream, er, data);
    });else done(stream);
  });
}

Transform.prototype.push = function (chunk, encoding) {
  this._transformState.needTransform = false;
  return Duplex.prototype.push.call(this, chunk, encoding);
};

// This is the part where you do stuff!
// override this function in implementation classes.
// 'chunk' is an input chunk.
//
// Call `push(newChunk)` to pass along transformed output
// to the readable side.  You may call 'push' zero or more times.
//
// Call `cb(err)` when you are done with this chunk.  If you pass
// an error, then that'll put the hurt on the whole operation.  If you
// never call cb(), then you'll never get another chunk.
Transform.prototype._transform = function (chunk, encoding, cb) {
  throw new Error('_transform() is not implemented');
};

Transform.prototype._write = function (chunk, encoding, cb) {
  var ts = this._transformState;
  ts.writecb = cb;
  ts.writechunk = chunk;
  ts.writeencoding = encoding;
  if (!ts.transforming) {
    var rs = this._readableState;
    if (ts.needTransform || rs.needReadable || rs.length < rs.highWaterMark) this._read(rs.highWaterMark);
  }
};

// Doesn't matter what the args are here.
// _transform does all the work.
// That we got here means that the readable side wants more data.
Transform.prototype._read = function (n) {
  var ts = this._transformState;

  if (ts.writechunk !== null && ts.writecb && !ts.transforming) {
    ts.transforming = true;
    this._transform(ts.writechunk, ts.writeencoding, ts.afterTransform);
  } else {
    // mark that we need a transform, so that any data that comes in
    // will get processed, now that we've asked for it.
    ts.needTransform = true;
  }
};

Transform.prototype._destroy = function (err, cb) {
  var _this = this;

  Duplex.prototype._destroy.call(this, err, function (err2) {
    cb(err2);
    _this.emit('close');
  });
};

function done(stream, er, data) {
  if (er) return stream.emit('error', er);

  if (data !== null && data !== undefined) stream.push(data);

  // if there's nothing in the write buffer, then that means
  // that nothing more will ever be provided
  var ws = stream._writableState;
  var ts = stream._transformState;

  if (ws.length) throw new Error('Calling transform done when ws.length != 0');

  if (ts.transforming) throw new Error('Calling transform done when still transforming');

  return stream.push(null);
}
},{"./_stream_duplex":85,"core-util-is":76,"inherits":79}],89:[function(require,module,exports){
(function (process,global){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

// A bit simpler than readable streams.
// Implement an async ._write(chunk, encoding, cb), and it'll handle all
// the drain event emission and buffering.

'use strict';

/*<replacement>*/

var processNextTick = require('process-nextick-args');
/*</replacement>*/

module.exports = Writable;

/* <replacement> */
function WriteReq(chunk, encoding, cb) {
  this.chunk = chunk;
  this.encoding = encoding;
  this.callback = cb;
  this.next = null;
}

// It seems a linked list but it is not
// there will be only 2 of these for each stream
function CorkedRequest(state) {
  var _this = this;

  this.next = null;
  this.entry = null;
  this.finish = function () {
    onCorkedFinish(_this, state);
  };
}
/* </replacement> */

/*<replacement>*/
var asyncWrite = !process.browser && ['v0.10', 'v0.9.'].indexOf(process.version.slice(0, 5)) > -1 ? setImmediate : processNextTick;
/*</replacement>*/

/*<replacement>*/
var Duplex;
/*</replacement>*/

Writable.WritableState = WritableState;

/*<replacement>*/
var util = require('core-util-is');
util.inherits = require('inherits');
/*</replacement>*/

/*<replacement>*/
var internalUtil = {
  deprecate: require('util-deprecate')
};
/*</replacement>*/

/*<replacement>*/
var Stream = require('./internal/streams/stream');
/*</replacement>*/

/*<replacement>*/
var Buffer = require('safe-buffer').Buffer;
var OurUint8Array = global.Uint8Array || function () {};
function _uint8ArrayToBuffer(chunk) {
  return Buffer.from(chunk);
}
function _isUint8Array(obj) {
  return Buffer.isBuffer(obj) || obj instanceof OurUint8Array;
}
/*</replacement>*/

var destroyImpl = require('./internal/streams/destroy');

util.inherits(Writable, Stream);

function nop() {}

function WritableState(options, stream) {
  Duplex = Duplex || require('./_stream_duplex');

  options = options || {};

  // object stream flag to indicate whether or not this stream
  // contains buffers or objects.
  this.objectMode = !!options.objectMode;

  if (stream instanceof Duplex) this.objectMode = this.objectMode || !!options.writableObjectMode;

  // the point at which write() starts returning false
  // Note: 0 is a valid value, means that we always return false if
  // the entire buffer is not flushed immediately on write()
  var hwm = options.highWaterMark;
  var defaultHwm = this.objectMode ? 16 : 16 * 1024;
  this.highWaterMark = hwm || hwm === 0 ? hwm : defaultHwm;

  // cast to ints.
  this.highWaterMark = Math.floor(this.highWaterMark);

  // if _final has been called
  this.finalCalled = false;

  // drain event flag.
  this.needDrain = false;
  // at the start of calling end()
  this.ending = false;
  // when end() has been called, and returned
  this.ended = false;
  // when 'finish' is emitted
  this.finished = false;

  // has it been destroyed
  this.destroyed = false;

  // should we decode strings into buffers before passing to _write?
  // this is here so that some node-core streams can optimize string
  // handling at a lower level.
  var noDecode = options.decodeStrings === false;
  this.decodeStrings = !noDecode;

  // Crypto is kind of old and crusty.  Historically, its default string
  // encoding is 'binary' so we have to make this configurable.
  // Everything else in the universe uses 'utf8', though.
  this.defaultEncoding = options.defaultEncoding || 'utf8';

  // not an actual buffer we keep track of, but a measurement
  // of how much we're waiting to get pushed to some underlying
  // socket or file.
  this.length = 0;

  // a flag to see when we're in the middle of a write.
  this.writing = false;

  // when true all writes will be buffered until .uncork() call
  this.corked = 0;

  // a flag to be able to tell if the onwrite cb is called immediately,
  // or on a later tick.  We set this to true at first, because any
  // actions that shouldn't happen until "later" should generally also
  // not happen before the first write call.
  this.sync = true;

  // a flag to know if we're processing previously buffered items, which
  // may call the _write() callback in the same tick, so that we don't
  // end up in an overlapped onwrite situation.
  this.bufferProcessing = false;

  // the callback that's passed to _write(chunk,cb)
  this.onwrite = function (er) {
    onwrite(stream, er);
  };

  // the callback that the user supplies to write(chunk,encoding,cb)
  this.writecb = null;

  // the amount that is being written when _write is called.
  this.writelen = 0;

  this.bufferedRequest = null;
  this.lastBufferedRequest = null;

  // number of pending user-supplied write callbacks
  // this must be 0 before 'finish' can be emitted
  this.pendingcb = 0;

  // emit prefinish if the only thing we're waiting for is _write cbs
  // This is relevant for synchronous Transform streams
  this.prefinished = false;

  // True if the error was already emitted and should not be thrown again
  this.errorEmitted = false;

  // count buffered requests
  this.bufferedRequestCount = 0;

  // allocate the first CorkedRequest, there is always
  // one allocated and free to use, and we maintain at most two
  this.corkedRequestsFree = new CorkedRequest(this);
}

WritableState.prototype.getBuffer = function getBuffer() {
  var current = this.bufferedRequest;
  var out = [];
  while (current) {
    out.push(current);
    current = current.next;
  }
  return out;
};

(function () {
  try {
    Object.defineProperty(WritableState.prototype, 'buffer', {
      get: internalUtil.deprecate(function () {
        return this.getBuffer();
      }, '_writableState.buffer is deprecated. Use _writableState.getBuffer ' + 'instead.', 'DEP0003')
    });
  } catch (_) {}
})();

// Test _writableState for inheritance to account for Duplex streams,
// whose prototype chain only points to Readable.
var realHasInstance;
if (typeof Symbol === 'function' && Symbol.hasInstance && typeof Function.prototype[Symbol.hasInstance] === 'function') {
  realHasInstance = Function.prototype[Symbol.hasInstance];
  Object.defineProperty(Writable, Symbol.hasInstance, {
    value: function (object) {
      if (realHasInstance.call(this, object)) return true;

      return object && object._writableState instanceof WritableState;
    }
  });
} else {
  realHasInstance = function (object) {
    return object instanceof this;
  };
}

function Writable(options) {
  Duplex = Duplex || require('./_stream_duplex');

  // Writable ctor is applied to Duplexes, too.
  // `realHasInstance` is necessary because using plain `instanceof`
  // would return false, as no `_writableState` property is attached.

  // Trying to use the custom `instanceof` for Writable here will also break the
  // Node.js LazyTransform implementation, which has a non-trivial getter for
  // `_writableState` that would lead to infinite recursion.
  if (!realHasInstance.call(Writable, this) && !(this instanceof Duplex)) {
    return new Writable(options);
  }

  this._writableState = new WritableState(options, this);

  // legacy.
  this.writable = true;

  if (options) {
    if (typeof options.write === 'function') this._write = options.write;

    if (typeof options.writev === 'function') this._writev = options.writev;

    if (typeof options.destroy === 'function') this._destroy = options.destroy;

    if (typeof options.final === 'function') this._final = options.final;
  }

  Stream.call(this);
}

// Otherwise people can pipe Writable streams, which is just wrong.
Writable.prototype.pipe = function () {
  this.emit('error', new Error('Cannot pipe, not readable'));
};

function writeAfterEnd(stream, cb) {
  var er = new Error('write after end');
  // TODO: defer error events consistently everywhere, not just the cb
  stream.emit('error', er);
  processNextTick(cb, er);
}

// Checks that a user-supplied chunk is valid, especially for the particular
// mode the stream is in. Currently this means that `null` is never accepted
// and undefined/non-string values are only allowed in object mode.
function validChunk(stream, state, chunk, cb) {
  var valid = true;
  var er = false;

  if (chunk === null) {
    er = new TypeError('May not write null values to stream');
  } else if (typeof chunk !== 'string' && chunk !== undefined && !state.objectMode) {
    er = new TypeError('Invalid non-string/buffer chunk');
  }
  if (er) {
    stream.emit('error', er);
    processNextTick(cb, er);
    valid = false;
  }
  return valid;
}

Writable.prototype.write = function (chunk, encoding, cb) {
  var state = this._writableState;
  var ret = false;
  var isBuf = _isUint8Array(chunk) && !state.objectMode;

  if (isBuf && !Buffer.isBuffer(chunk)) {
    chunk = _uint8ArrayToBuffer(chunk);
  }

  if (typeof encoding === 'function') {
    cb = encoding;
    encoding = null;
  }

  if (isBuf) encoding = 'buffer';else if (!encoding) encoding = state.defaultEncoding;

  if (typeof cb !== 'function') cb = nop;

  if (state.ended) writeAfterEnd(this, cb);else if (isBuf || validChunk(this, state, chunk, cb)) {
    state.pendingcb++;
    ret = writeOrBuffer(this, state, isBuf, chunk, encoding, cb);
  }

  return ret;
};

Writable.prototype.cork = function () {
  var state = this._writableState;

  state.corked++;
};

Writable.prototype.uncork = function () {
  var state = this._writableState;

  if (state.corked) {
    state.corked--;

    if (!state.writing && !state.corked && !state.finished && !state.bufferProcessing && state.bufferedRequest) clearBuffer(this, state);
  }
};

Writable.prototype.setDefaultEncoding = function setDefaultEncoding(encoding) {
  // node::ParseEncoding() requires lower case.
  if (typeof encoding === 'string') encoding = encoding.toLowerCase();
  if (!(['hex', 'utf8', 'utf-8', 'ascii', 'binary', 'base64', 'ucs2', 'ucs-2', 'utf16le', 'utf-16le', 'raw'].indexOf((encoding + '').toLowerCase()) > -1)) throw new TypeError('Unknown encoding: ' + encoding);
  this._writableState.defaultEncoding = encoding;
  return this;
};

function decodeChunk(state, chunk, encoding) {
  if (!state.objectMode && state.decodeStrings !== false && typeof chunk === 'string') {
    chunk = Buffer.from(chunk, encoding);
  }
  return chunk;
}

// if we're already writing something, then just put this
// in the queue, and wait our turn.  Otherwise, call _write
// If we return false, then we need a drain event, so set that flag.
function writeOrBuffer(stream, state, isBuf, chunk, encoding, cb) {
  if (!isBuf) {
    var newChunk = decodeChunk(state, chunk, encoding);
    if (chunk !== newChunk) {
      isBuf = true;
      encoding = 'buffer';
      chunk = newChunk;
    }
  }
  var len = state.objectMode ? 1 : chunk.length;

  state.length += len;

  var ret = state.length < state.highWaterMark;
  // we must ensure that previous needDrain will not be reset to false.
  if (!ret) state.needDrain = true;

  if (state.writing || state.corked) {
    var last = state.lastBufferedRequest;
    state.lastBufferedRequest = {
      chunk: chunk,
      encoding: encoding,
      isBuf: isBuf,
      callback: cb,
      next: null
    };
    if (last) {
      last.next = state.lastBufferedRequest;
    } else {
      state.bufferedRequest = state.lastBufferedRequest;
    }
    state.bufferedRequestCount += 1;
  } else {
    doWrite(stream, state, false, len, chunk, encoding, cb);
  }

  return ret;
}

function doWrite(stream, state, writev, len, chunk, encoding, cb) {
  state.writelen = len;
  state.writecb = cb;
  state.writing = true;
  state.sync = true;
  if (writev) stream._writev(chunk, state.onwrite);else stream._write(chunk, encoding, state.onwrite);
  state.sync = false;
}

function onwriteError(stream, state, sync, er, cb) {
  --state.pendingcb;

  if (sync) {
    // defer the callback if we are being called synchronously
    // to avoid piling up things on the stack
    processNextTick(cb, er);
    // this can emit finish, and it will always happen
    // after error
    processNextTick(finishMaybe, stream, state);
    stream._writableState.errorEmitted = true;
    stream.emit('error', er);
  } else {
    // the caller expect this to happen before if
    // it is async
    cb(er);
    stream._writableState.errorEmitted = true;
    stream.emit('error', er);
    // this can emit finish, but finish must
    // always follow error
    finishMaybe(stream, state);
  }
}

function onwriteStateUpdate(state) {
  state.writing = false;
  state.writecb = null;
  state.length -= state.writelen;
  state.writelen = 0;
}

function onwrite(stream, er) {
  var state = stream._writableState;
  var sync = state.sync;
  var cb = state.writecb;

  onwriteStateUpdate(state);

  if (er) onwriteError(stream, state, sync, er, cb);else {
    // Check if we're actually ready to finish, but don't emit yet
    var finished = needFinish(state);

    if (!finished && !state.corked && !state.bufferProcessing && state.bufferedRequest) {
      clearBuffer(stream, state);
    }

    if (sync) {
      /*<replacement>*/
      asyncWrite(afterWrite, stream, state, finished, cb);
      /*</replacement>*/
    } else {
      afterWrite(stream, state, finished, cb);
    }
  }
}

function afterWrite(stream, state, finished, cb) {
  if (!finished) onwriteDrain(stream, state);
  state.pendingcb--;
  cb();
  finishMaybe(stream, state);
}

// Must force callback to be called on nextTick, so that we don't
// emit 'drain' before the write() consumer gets the 'false' return
// value, and has a chance to attach a 'drain' listener.
function onwriteDrain(stream, state) {
  if (state.length === 0 && state.needDrain) {
    state.needDrain = false;
    stream.emit('drain');
  }
}

// if there's something in the buffer waiting, then process it
function clearBuffer(stream, state) {
  state.bufferProcessing = true;
  var entry = state.bufferedRequest;

  if (stream._writev && entry && entry.next) {
    // Fast case, write everything using _writev()
    var l = state.bufferedRequestCount;
    var buffer = new Array(l);
    var holder = state.corkedRequestsFree;
    holder.entry = entry;

    var count = 0;
    var allBuffers = true;
    while (entry) {
      buffer[count] = entry;
      if (!entry.isBuf) allBuffers = false;
      entry = entry.next;
      count += 1;
    }
    buffer.allBuffers = allBuffers;

    doWrite(stream, state, true, state.length, buffer, '', holder.finish);

    // doWrite is almost always async, defer these to save a bit of time
    // as the hot path ends with doWrite
    state.pendingcb++;
    state.lastBufferedRequest = null;
    if (holder.next) {
      state.corkedRequestsFree = holder.next;
      holder.next = null;
    } else {
      state.corkedRequestsFree = new CorkedRequest(state);
    }
  } else {
    // Slow case, write chunks one-by-one
    while (entry) {
      var chunk = entry.chunk;
      var encoding = entry.encoding;
      var cb = entry.callback;
      var len = state.objectMode ? 1 : chunk.length;

      doWrite(stream, state, false, len, chunk, encoding, cb);
      entry = entry.next;
      // if we didn't call the onwrite immediately, then
      // it means that we need to wait until it does.
      // also, that means that the chunk and cb are currently
      // being processed, so move the buffer counter past them.
      if (state.writing) {
        break;
      }
    }

    if (entry === null) state.lastBufferedRequest = null;
  }

  state.bufferedRequestCount = 0;
  state.bufferedRequest = entry;
  state.bufferProcessing = false;
}

Writable.prototype._write = function (chunk, encoding, cb) {
  cb(new Error('_write() is not implemented'));
};

Writable.prototype._writev = null;

Writable.prototype.end = function (chunk, encoding, cb) {
  var state = this._writableState;

  if (typeof chunk === 'function') {
    cb = chunk;
    chunk = null;
    encoding = null;
  } else if (typeof encoding === 'function') {
    cb = encoding;
    encoding = null;
  }

  if (chunk !== null && chunk !== undefined) this.write(chunk, encoding);

  // .end() fully uncorks
  if (state.corked) {
    state.corked = 1;
    this.uncork();
  }

  // ignore unnecessary end() calls.
  if (!state.ending && !state.finished) endWritable(this, state, cb);
};

function needFinish(state) {
  return state.ending && state.length === 0 && state.bufferedRequest === null && !state.finished && !state.writing;
}
function callFinal(stream, state) {
  stream._final(function (err) {
    state.pendingcb--;
    if (err) {
      stream.emit('error', err);
    }
    state.prefinished = true;
    stream.emit('prefinish');
    finishMaybe(stream, state);
  });
}
function prefinish(stream, state) {
  if (!state.prefinished && !state.finalCalled) {
    if (typeof stream._final === 'function') {
      state.pendingcb++;
      state.finalCalled = true;
      processNextTick(callFinal, stream, state);
    } else {
      state.prefinished = true;
      stream.emit('prefinish');
    }
  }
}

function finishMaybe(stream, state) {
  var need = needFinish(state);
  if (need) {
    prefinish(stream, state);
    if (state.pendingcb === 0) {
      state.finished = true;
      stream.emit('finish');
    }
  }
  return need;
}

function endWritable(stream, state, cb) {
  state.ending = true;
  finishMaybe(stream, state);
  if (cb) {
    if (state.finished) processNextTick(cb);else stream.once('finish', cb);
  }
  state.ended = true;
  stream.writable = false;
}

function onCorkedFinish(corkReq, state, err) {
  var entry = corkReq.entry;
  corkReq.entry = null;
  while (entry) {
    var cb = entry.callback;
    state.pendingcb--;
    cb(err);
    entry = entry.next;
  }
  if (state.corkedRequestsFree) {
    state.corkedRequestsFree.next = corkReq;
  } else {
    state.corkedRequestsFree = corkReq;
  }
}

Object.defineProperty(Writable.prototype, 'destroyed', {
  get: function () {
    if (this._writableState === undefined) {
      return false;
    }
    return this._writableState.destroyed;
  },
  set: function (value) {
    // we ignore the value if the stream
    // has not been initialized yet
    if (!this._writableState) {
      return;
    }

    // backward compatibility, the user is explicitly
    // managing destroyed
    this._writableState.destroyed = value;
  }
});

Writable.prototype.destroy = destroyImpl.destroy;
Writable.prototype._undestroy = destroyImpl.undestroy;
Writable.prototype._destroy = function (err, cb) {
  this.end();
  cb(err);
};
}).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"./_stream_duplex":85,"./internal/streams/destroy":91,"./internal/streams/stream":92,"_process":83,"core-util-is":76,"inherits":79,"process-nextick-args":82,"safe-buffer":97,"util-deprecate":100}],90:[function(require,module,exports){
'use strict';

/*<replacement>*/

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

var Buffer = require('safe-buffer').Buffer;
/*</replacement>*/

function copyBuffer(src, target, offset) {
  src.copy(target, offset);
}

module.exports = function () {
  function BufferList() {
    _classCallCheck(this, BufferList);

    this.head = null;
    this.tail = null;
    this.length = 0;
  }

  BufferList.prototype.push = function push(v) {
    var entry = { data: v, next: null };
    if (this.length > 0) this.tail.next = entry;else this.head = entry;
    this.tail = entry;
    ++this.length;
  };

  BufferList.prototype.unshift = function unshift(v) {
    var entry = { data: v, next: this.head };
    if (this.length === 0) this.tail = entry;
    this.head = entry;
    ++this.length;
  };

  BufferList.prototype.shift = function shift() {
    if (this.length === 0) return;
    var ret = this.head.data;
    if (this.length === 1) this.head = this.tail = null;else this.head = this.head.next;
    --this.length;
    return ret;
  };

  BufferList.prototype.clear = function clear() {
    this.head = this.tail = null;
    this.length = 0;
  };

  BufferList.prototype.join = function join(s) {
    if (this.length === 0) return '';
    var p = this.head;
    var ret = '' + p.data;
    while (p = p.next) {
      ret += s + p.data;
    }return ret;
  };

  BufferList.prototype.concat = function concat(n) {
    if (this.length === 0) return Buffer.alloc(0);
    if (this.length === 1) return this.head.data;
    var ret = Buffer.allocUnsafe(n >>> 0);
    var p = this.head;
    var i = 0;
    while (p) {
      copyBuffer(p.data, ret, i);
      i += p.data.length;
      p = p.next;
    }
    return ret;
  };

  return BufferList;
}();
},{"safe-buffer":97}],91:[function(require,module,exports){
'use strict';

/*<replacement>*/

var processNextTick = require('process-nextick-args');
/*</replacement>*/

// undocumented cb() API, needed for core, not for public API
function destroy(err, cb) {
  var _this = this;

  var readableDestroyed = this._readableState && this._readableState.destroyed;
  var writableDestroyed = this._writableState && this._writableState.destroyed;

  if (readableDestroyed || writableDestroyed) {
    if (cb) {
      cb(err);
    } else if (err && (!this._writableState || !this._writableState.errorEmitted)) {
      processNextTick(emitErrorNT, this, err);
    }
    return;
  }

  // we set destroyed to true before firing error callbacks in order
  // to make it re-entrance safe in case destroy() is called within callbacks

  if (this._readableState) {
    this._readableState.destroyed = true;
  }

  // if this is a duplex stream mark the writable part as destroyed as well
  if (this._writableState) {
    this._writableState.destroyed = true;
  }

  this._destroy(err || null, function (err) {
    if (!cb && err) {
      processNextTick(emitErrorNT, _this, err);
      if (_this._writableState) {
        _this._writableState.errorEmitted = true;
      }
    } else if (cb) {
      cb(err);
    }
  });
}

function undestroy() {
  if (this._readableState) {
    this._readableState.destroyed = false;
    this._readableState.reading = false;
    this._readableState.ended = false;
    this._readableState.endEmitted = false;
  }

  if (this._writableState) {
    this._writableState.destroyed = false;
    this._writableState.ended = false;
    this._writableState.ending = false;
    this._writableState.finished = false;
    this._writableState.errorEmitted = false;
  }
}

function emitErrorNT(self, err) {
  self.emit('error', err);
}

module.exports = {
  destroy: destroy,
  undestroy: undestroy
};
},{"process-nextick-args":82}],92:[function(require,module,exports){
module.exports = require('events').EventEmitter;

},{"events":77}],93:[function(require,module,exports){
module.exports = require('./readable').PassThrough

},{"./readable":94}],94:[function(require,module,exports){
exports = module.exports = require('./lib/_stream_readable.js');
exports.Stream = exports;
exports.Readable = exports;
exports.Writable = require('./lib/_stream_writable.js');
exports.Duplex = require('./lib/_stream_duplex.js');
exports.Transform = require('./lib/_stream_transform.js');
exports.PassThrough = require('./lib/_stream_passthrough.js');

},{"./lib/_stream_duplex.js":85,"./lib/_stream_passthrough.js":86,"./lib/_stream_readable.js":87,"./lib/_stream_transform.js":88,"./lib/_stream_writable.js":89}],95:[function(require,module,exports){
module.exports = require('./readable').Transform

},{"./readable":94}],96:[function(require,module,exports){
module.exports = require('./lib/_stream_writable.js');

},{"./lib/_stream_writable.js":89}],97:[function(require,module,exports){
/* eslint-disable node/no-deprecated-api */
var buffer = require('buffer')
var Buffer = buffer.Buffer

// alternative to using Object.keys for old browsers
function copyProps (src, dst) {
  for (var key in src) {
    dst[key] = src[key]
  }
}
if (Buffer.from && Buffer.alloc && Buffer.allocUnsafe && Buffer.allocUnsafeSlow) {
  module.exports = buffer
} else {
  // Copy properties from require('buffer')
  copyProps(buffer, exports)
  exports.Buffer = SafeBuffer
}

function SafeBuffer (arg, encodingOrOffset, length) {
  return Buffer(arg, encodingOrOffset, length)
}

// Copy static methods from Buffer
copyProps(Buffer, SafeBuffer)

SafeBuffer.from = function (arg, encodingOrOffset, length) {
  if (typeof arg === 'number') {
    throw new TypeError('Argument must not be a number')
  }
  return Buffer(arg, encodingOrOffset, length)
}

SafeBuffer.alloc = function (size, fill, encoding) {
  if (typeof size !== 'number') {
    throw new TypeError('Argument must be a number')
  }
  var buf = Buffer(size)
  if (fill !== undefined) {
    if (typeof encoding === 'string') {
      buf.fill(fill, encoding)
    } else {
      buf.fill(fill)
    }
  } else {
    buf.fill(0)
  }
  return buf
}

SafeBuffer.allocUnsafe = function (size) {
  if (typeof size !== 'number') {
    throw new TypeError('Argument must be a number')
  }
  return Buffer(size)
}

SafeBuffer.allocUnsafeSlow = function (size) {
  if (typeof size !== 'number') {
    throw new TypeError('Argument must be a number')
  }
  return buffer.SlowBuffer(size)
}

},{"buffer":75}],98:[function(require,module,exports){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

module.exports = Stream;

var EE = require('events').EventEmitter;
var inherits = require('inherits');

inherits(Stream, EE);
Stream.Readable = require('readable-stream/readable.js');
Stream.Writable = require('readable-stream/writable.js');
Stream.Duplex = require('readable-stream/duplex.js');
Stream.Transform = require('readable-stream/transform.js');
Stream.PassThrough = require('readable-stream/passthrough.js');

// Backwards-compat with node 0.4.x
Stream.Stream = Stream;



// old-style streams.  Note that the pipe method (the only relevant
// part of this class) is overridden in the Readable class.

function Stream() {
  EE.call(this);
}

Stream.prototype.pipe = function(dest, options) {
  var source = this;

  function ondata(chunk) {
    if (dest.writable) {
      if (false === dest.write(chunk) && source.pause) {
        source.pause();
      }
    }
  }

  source.on('data', ondata);

  function ondrain() {
    if (source.readable && source.resume) {
      source.resume();
    }
  }

  dest.on('drain', ondrain);

  // If the 'end' option is not supplied, dest.end() will be called when
  // source gets the 'end' or 'close' events.  Only dest.end() once.
  if (!dest._isStdio && (!options || options.end !== false)) {
    source.on('end', onend);
    source.on('close', onclose);
  }

  var didOnEnd = false;
  function onend() {
    if (didOnEnd) return;
    didOnEnd = true;

    dest.end();
  }


  function onclose() {
    if (didOnEnd) return;
    didOnEnd = true;

    if (typeof dest.destroy === 'function') dest.destroy();
  }

  // don't leave dangling pipes when there are errors.
  function onerror(er) {
    cleanup();
    if (EE.listenerCount(this, 'error') === 0) {
      throw er; // Unhandled stream error in pipe.
    }
  }

  source.on('error', onerror);
  dest.on('error', onerror);

  // remove all the event listeners that were added.
  function cleanup() {
    source.removeListener('data', ondata);
    dest.removeListener('drain', ondrain);

    source.removeListener('end', onend);
    source.removeListener('close', onclose);

    source.removeListener('error', onerror);
    dest.removeListener('error', onerror);

    source.removeListener('end', cleanup);
    source.removeListener('close', cleanup);

    dest.removeListener('close', cleanup);
  }

  source.on('end', cleanup);
  source.on('close', cleanup);

  dest.on('close', cleanup);

  dest.emit('pipe', source);

  // Allow for unix-like usage: A.pipe(B).pipe(C)
  return dest;
};

},{"events":77,"inherits":79,"readable-stream/duplex.js":84,"readable-stream/passthrough.js":93,"readable-stream/readable.js":94,"readable-stream/transform.js":95,"readable-stream/writable.js":96}],99:[function(require,module,exports){
'use strict';

var Buffer = require('safe-buffer').Buffer;

var isEncoding = Buffer.isEncoding || function (encoding) {
  encoding = '' + encoding;
  switch (encoding && encoding.toLowerCase()) {
    case 'hex':case 'utf8':case 'utf-8':case 'ascii':case 'binary':case 'base64':case 'ucs2':case 'ucs-2':case 'utf16le':case 'utf-16le':case 'raw':
      return true;
    default:
      return false;
  }
};

function _normalizeEncoding(enc) {
  if (!enc) return 'utf8';
  var retried;
  while (true) {
    switch (enc) {
      case 'utf8':
      case 'utf-8':
        return 'utf8';
      case 'ucs2':
      case 'ucs-2':
      case 'utf16le':
      case 'utf-16le':
        return 'utf16le';
      case 'latin1':
      case 'binary':
        return 'latin1';
      case 'base64':
      case 'ascii':
      case 'hex':
        return enc;
      default:
        if (retried) return; // undefined
        enc = ('' + enc).toLowerCase();
        retried = true;
    }
  }
};

// Do not cache `Buffer.isEncoding` when checking encoding names as some
// modules monkey-patch it to support additional encodings
function normalizeEncoding(enc) {
  var nenc = _normalizeEncoding(enc);
  if (typeof nenc !== 'string' && (Buffer.isEncoding === isEncoding || !isEncoding(enc))) throw new Error('Unknown encoding: ' + enc);
  return nenc || enc;
}

// StringDecoder provides an interface for efficiently splitting a series of
// buffers into a series of JS strings without breaking apart multi-byte
// characters.
exports.StringDecoder = StringDecoder;
function StringDecoder(encoding) {
  this.encoding = normalizeEncoding(encoding);
  var nb;
  switch (this.encoding) {
    case 'utf16le':
      this.text = utf16Text;
      this.end = utf16End;
      nb = 4;
      break;
    case 'utf8':
      this.fillLast = utf8FillLast;
      nb = 4;
      break;
    case 'base64':
      this.text = base64Text;
      this.end = base64End;
      nb = 3;
      break;
    default:
      this.write = simpleWrite;
      this.end = simpleEnd;
      return;
  }
  this.lastNeed = 0;
  this.lastTotal = 0;
  this.lastChar = Buffer.allocUnsafe(nb);
}

StringDecoder.prototype.write = function (buf) {
  if (buf.length === 0) return '';
  var r;
  var i;
  if (this.lastNeed) {
    r = this.fillLast(buf);
    if (r === undefined) return '';
    i = this.lastNeed;
    this.lastNeed = 0;
  } else {
    i = 0;
  }
  if (i < buf.length) return r ? r + this.text(buf, i) : this.text(buf, i);
  return r || '';
};

StringDecoder.prototype.end = utf8End;

// Returns only complete characters in a Buffer
StringDecoder.prototype.text = utf8Text;

// Attempts to complete a partial non-UTF-8 character using bytes from a Buffer
StringDecoder.prototype.fillLast = function (buf) {
  if (this.lastNeed <= buf.length) {
    buf.copy(this.lastChar, this.lastTotal - this.lastNeed, 0, this.lastNeed);
    return this.lastChar.toString(this.encoding, 0, this.lastTotal);
  }
  buf.copy(this.lastChar, this.lastTotal - this.lastNeed, 0, buf.length);
  this.lastNeed -= buf.length;
};

// Checks the type of a UTF-8 byte, whether it's ASCII, a leading byte, or a
// continuation byte.
function utf8CheckByte(byte) {
  if (byte <= 0x7F) return 0;else if (byte >> 5 === 0x06) return 2;else if (byte >> 4 === 0x0E) return 3;else if (byte >> 3 === 0x1E) return 4;
  return -1;
}

// Checks at most 3 bytes at the end of a Buffer in order to detect an
// incomplete multi-byte UTF-8 character. The total number of bytes (2, 3, or 4)
// needed to complete the UTF-8 character (if applicable) are returned.
function utf8CheckIncomplete(self, buf, i) {
  var j = buf.length - 1;
  if (j < i) return 0;
  var nb = utf8CheckByte(buf[j]);
  if (nb >= 0) {
    if (nb > 0) self.lastNeed = nb - 1;
    return nb;
  }
  if (--j < i) return 0;
  nb = utf8CheckByte(buf[j]);
  if (nb >= 0) {
    if (nb > 0) self.lastNeed = nb - 2;
    return nb;
  }
  if (--j < i) return 0;
  nb = utf8CheckByte(buf[j]);
  if (nb >= 0) {
    if (nb > 0) {
      if (nb === 2) nb = 0;else self.lastNeed = nb - 3;
    }
    return nb;
  }
  return 0;
}

// Validates as many continuation bytes for a multi-byte UTF-8 character as
// needed or are available. If we see a non-continuation byte where we expect
// one, we "replace" the validated continuation bytes we've seen so far with
// UTF-8 replacement characters ('\ufffd'), to match v8's UTF-8 decoding
// behavior. The continuation byte check is included three times in the case
// where all of the continuation bytes for a character exist in the same buffer.
// It is also done this way as a slight performance increase instead of using a
// loop.
function utf8CheckExtraBytes(self, buf, p) {
  if ((buf[0] & 0xC0) !== 0x80) {
    self.lastNeed = 0;
    return '\ufffd'.repeat(p);
  }
  if (self.lastNeed > 1 && buf.length > 1) {
    if ((buf[1] & 0xC0) !== 0x80) {
      self.lastNeed = 1;
      return '\ufffd'.repeat(p + 1);
    }
    if (self.lastNeed > 2 && buf.length > 2) {
      if ((buf[2] & 0xC0) !== 0x80) {
        self.lastNeed = 2;
        return '\ufffd'.repeat(p + 2);
      }
    }
  }
}

// Attempts to complete a multi-byte UTF-8 character using bytes from a Buffer.
function utf8FillLast(buf) {
  var p = this.lastTotal - this.lastNeed;
  var r = utf8CheckExtraBytes(this, buf, p);
  if (r !== undefined) return r;
  if (this.lastNeed <= buf.length) {
    buf.copy(this.lastChar, p, 0, this.lastNeed);
    return this.lastChar.toString(this.encoding, 0, this.lastTotal);
  }
  buf.copy(this.lastChar, p, 0, buf.length);
  this.lastNeed -= buf.length;
}

// Returns all complete UTF-8 characters in a Buffer. If the Buffer ended on a
// partial character, the character's bytes are buffered until the required
// number of bytes are available.
function utf8Text(buf, i) {
  var total = utf8CheckIncomplete(this, buf, i);
  if (!this.lastNeed) return buf.toString('utf8', i);
  this.lastTotal = total;
  var end = buf.length - (total - this.lastNeed);
  buf.copy(this.lastChar, 0, end);
  return buf.toString('utf8', i, end);
}

// For UTF-8, a replacement character for each buffered byte of a (partial)
// character needs to be added to the output.
function utf8End(buf) {
  var r = buf && buf.length ? this.write(buf) : '';
  if (this.lastNeed) return r + '\ufffd'.repeat(this.lastTotal - this.lastNeed);
  return r;
}

// UTF-16LE typically needs two bytes per character, but even if we have an even
// number of bytes available, we need to check if we end on a leading/high
// surrogate. In that case, we need to wait for the next two bytes in order to
// decode the last character properly.
function utf16Text(buf, i) {
  if ((buf.length - i) % 2 === 0) {
    var r = buf.toString('utf16le', i);
    if (r) {
      var c = r.charCodeAt(r.length - 1);
      if (c >= 0xD800 && c <= 0xDBFF) {
        this.lastNeed = 2;
        this.lastTotal = 4;
        this.lastChar[0] = buf[buf.length - 2];
        this.lastChar[1] = buf[buf.length - 1];
        return r.slice(0, -1);
      }
    }
    return r;
  }
  this.lastNeed = 1;
  this.lastTotal = 2;
  this.lastChar[0] = buf[buf.length - 1];
  return buf.toString('utf16le', i, buf.length - 1);
}

// For UTF-16LE we do not explicitly append special replacement characters if we
// end on a partial character, we simply let v8 handle that.
function utf16End(buf) {
  var r = buf && buf.length ? this.write(buf) : '';
  if (this.lastNeed) {
    var end = this.lastTotal - this.lastNeed;
    return r + this.lastChar.toString('utf16le', 0, end);
  }
  return r;
}

function base64Text(buf, i) {
  var n = (buf.length - i) % 3;
  if (n === 0) return buf.toString('base64', i);
  this.lastNeed = 3 - n;
  this.lastTotal = 3;
  if (n === 1) {
    this.lastChar[0] = buf[buf.length - 1];
  } else {
    this.lastChar[0] = buf[buf.length - 2];
    this.lastChar[1] = buf[buf.length - 1];
  }
  return buf.toString('base64', i, buf.length - n);
}

function base64End(buf) {
  var r = buf && buf.length ? this.write(buf) : '';
  if (this.lastNeed) return r + this.lastChar.toString('base64', 0, 3 - this.lastNeed);
  return r;
}

// Pass bytes on through for single-byte encodings (e.g. ascii, latin1, hex)
function simpleWrite(buf) {
  return buf.toString(this.encoding);
}

function simpleEnd(buf) {
  return buf && buf.length ? this.write(buf) : '';
}
},{"safe-buffer":97}],100:[function(require,module,exports){
(function (global){

/**
 * Module exports.
 */

module.exports = deprecate;

/**
 * Mark that a method should not be used.
 * Returns a modified function which warns once by default.
 *
 * If `localStorage.noDeprecation = true` is set, then it is a no-op.
 *
 * If `localStorage.throwDeprecation = true` is set, then deprecated functions
 * will throw an Error when invoked.
 *
 * If `localStorage.traceDeprecation = true` is set, then deprecated functions
 * will invoke `console.trace()` instead of `console.error()`.
 *
 * @param {Function} fn - the function to deprecate
 * @param {String} msg - the string to print to the console when `fn` is invoked
 * @returns {Function} a new "deprecated" version of `fn`
 * @api public
 */

function deprecate (fn, msg) {
  if (config('noDeprecation')) {
    return fn;
  }

  var warned = false;
  function deprecated() {
    if (!warned) {
      if (config('throwDeprecation')) {
        throw new Error(msg);
      } else if (config('traceDeprecation')) {
        console.trace(msg);
      } else {
        console.warn(msg);
      }
      warned = true;
    }
    return fn.apply(this, arguments);
  }

  return deprecated;
}

/**
 * Checks `localStorage` for boolean values for the given `name`.
 *
 * @param {String} name
 * @returns {Boolean}
 * @api private
 */

function config (name) {
  // accessing global.localStorage can trigger a DOMException in sandboxed iframes
  try {
    if (!global.localStorage) return false;
  } catch (_) {
    return false;
  }
  var val = global.localStorage[name];
  if (null == val) return false;
  return String(val).toLowerCase() === 'true';
}

}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{}],101:[function(require,module,exports){
arguments[4][79][0].apply(exports,arguments)
},{"dup":79}],102:[function(require,module,exports){
module.exports = function isBuffer(arg) {
  return arg && typeof arg === 'object'
    && typeof arg.copy === 'function'
    && typeof arg.fill === 'function'
    && typeof arg.readUInt8 === 'function';
}
},{}],103:[function(require,module,exports){
(function (process,global){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

var formatRegExp = /%[sdj%]/g;
exports.format = function(f) {
  if (!isString(f)) {
    var objects = [];
    for (var i = 0; i < arguments.length; i++) {
      objects.push(inspect(arguments[i]));
    }
    return objects.join(' ');
  }

  var i = 1;
  var args = arguments;
  var len = args.length;
  var str = String(f).replace(formatRegExp, function(x) {
    if (x === '%%') return '%';
    if (i >= len) return x;
    switch (x) {
      case '%s': return String(args[i++]);
      case '%d': return Number(args[i++]);
      case '%j':
        try {
          return JSON.stringify(args[i++]);
        } catch (_) {
          return '[Circular]';
        }
      default:
        return x;
    }
  });
  for (var x = args[i]; i < len; x = args[++i]) {
    if (isNull(x) || !isObject(x)) {
      str += ' ' + x;
    } else {
      str += ' ' + inspect(x);
    }
  }
  return str;
};


// Mark that a method should not be used.
// Returns a modified function which warns once by default.
// If --no-deprecation is set, then it is a no-op.
exports.deprecate = function(fn, msg) {
  // Allow for deprecating things in the process of starting up.
  if (isUndefined(global.process)) {
    return function() {
      return exports.deprecate(fn, msg).apply(this, arguments);
    };
  }

  if (process.noDeprecation === true) {
    return fn;
  }

  var warned = false;
  function deprecated() {
    if (!warned) {
      if (process.throwDeprecation) {
        throw new Error(msg);
      } else if (process.traceDeprecation) {
        console.trace(msg);
      } else {
        console.error(msg);
      }
      warned = true;
    }
    return fn.apply(this, arguments);
  }

  return deprecated;
};


var debugs = {};
var debugEnviron;
exports.debuglog = function(set) {
  if (isUndefined(debugEnviron))
    debugEnviron = process.env.NODE_DEBUG || '';
  set = set.toUpperCase();
  if (!debugs[set]) {
    if (new RegExp('\\b' + set + '\\b', 'i').test(debugEnviron)) {
      var pid = process.pid;
      debugs[set] = function() {
        var msg = exports.format.apply(exports, arguments);
        console.error('%s %d: %s', set, pid, msg);
      };
    } else {
      debugs[set] = function() {};
    }
  }
  return debugs[set];
};


/**
 * Echos the value of a value. Trys to print the value out
 * in the best way possible given the different types.
 *
 * @param {Object} obj The object to print out.
 * @param {Object} opts Optional options object that alters the output.
 */
/* legacy: obj, showHidden, depth, colors*/
function inspect(obj, opts) {
  // default options
  var ctx = {
    seen: [],
    stylize: stylizeNoColor
  };
  // legacy...
  if (arguments.length >= 3) ctx.depth = arguments[2];
  if (arguments.length >= 4) ctx.colors = arguments[3];
  if (isBoolean(opts)) {
    // legacy...
    ctx.showHidden = opts;
  } else if (opts) {
    // got an "options" object
    exports._extend(ctx, opts);
  }
  // set default options
  if (isUndefined(ctx.showHidden)) ctx.showHidden = false;
  if (isUndefined(ctx.depth)) ctx.depth = 2;
  if (isUndefined(ctx.colors)) ctx.colors = false;
  if (isUndefined(ctx.customInspect)) ctx.customInspect = true;
  if (ctx.colors) ctx.stylize = stylizeWithColor;
  return formatValue(ctx, obj, ctx.depth);
}
exports.inspect = inspect;


// http://en.wikipedia.org/wiki/ANSI_escape_code#graphics
inspect.colors = {
  'bold' : [1, 22],
  'italic' : [3, 23],
  'underline' : [4, 24],
  'inverse' : [7, 27],
  'white' : [37, 39],
  'grey' : [90, 39],
  'black' : [30, 39],
  'blue' : [34, 39],
  'cyan' : [36, 39],
  'green' : [32, 39],
  'magenta' : [35, 39],
  'red' : [31, 39],
  'yellow' : [33, 39]
};

// Don't use 'blue' not visible on cmd.exe
inspect.styles = {
  'special': 'cyan',
  'number': 'yellow',
  'boolean': 'yellow',
  'undefined': 'grey',
  'null': 'bold',
  'string': 'green',
  'date': 'magenta',
  // "name": intentionally not styling
  'regexp': 'red'
};


function stylizeWithColor(str, styleType) {
  var style = inspect.styles[styleType];

  if (style) {
    return '\u001b[' + inspect.colors[style][0] + 'm' + str +
           '\u001b[' + inspect.colors[style][1] + 'm';
  } else {
    return str;
  }
}


function stylizeNoColor(str, styleType) {
  return str;
}


function arrayToHash(array) {
  var hash = {};

  array.forEach(function(val, idx) {
    hash[val] = true;
  });

  return hash;
}


function formatValue(ctx, value, recurseTimes) {
  // Provide a hook for user-specified inspect functions.
  // Check that value is an object with an inspect function on it
  if (ctx.customInspect &&
      value &&
      isFunction(value.inspect) &&
      // Filter out the util module, it's inspect function is special
      value.inspect !== exports.inspect &&
      // Also filter out any prototype objects using the circular check.
      !(value.constructor && value.constructor.prototype === value)) {
    var ret = value.inspect(recurseTimes, ctx);
    if (!isString(ret)) {
      ret = formatValue(ctx, ret, recurseTimes);
    }
    return ret;
  }

  // Primitive types cannot have properties
  var primitive = formatPrimitive(ctx, value);
  if (primitive) {
    return primitive;
  }

  // Look up the keys of the object.
  var keys = Object.keys(value);
  var visibleKeys = arrayToHash(keys);

  if (ctx.showHidden) {
    keys = Object.getOwnPropertyNames(value);
  }

  // IE doesn't make error fields non-enumerable
  // http://msdn.microsoft.com/en-us/library/ie/dww52sbt(v=vs.94).aspx
  if (isError(value)
      && (keys.indexOf('message') >= 0 || keys.indexOf('description') >= 0)) {
    return formatError(value);
  }

  // Some type of object without properties can be shortcutted.
  if (keys.length === 0) {
    if (isFunction(value)) {
      var name = value.name ? ': ' + value.name : '';
      return ctx.stylize('[Function' + name + ']', 'special');
    }
    if (isRegExp(value)) {
      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
    }
    if (isDate(value)) {
      return ctx.stylize(Date.prototype.toString.call(value), 'date');
    }
    if (isError(value)) {
      return formatError(value);
    }
  }

  var base = '', array = false, braces = ['{', '}'];

  // Make Array say that they are Array
  if (isArray(value)) {
    array = true;
    braces = ['[', ']'];
  }

  // Make functions say that they are functions
  if (isFunction(value)) {
    var n = value.name ? ': ' + value.name : '';
    base = ' [Function' + n + ']';
  }

  // Make RegExps say that they are RegExps
  if (isRegExp(value)) {
    base = ' ' + RegExp.prototype.toString.call(value);
  }

  // Make dates with properties first say the date
  if (isDate(value)) {
    base = ' ' + Date.prototype.toUTCString.call(value);
  }

  // Make error with message first say the error
  if (isError(value)) {
    base = ' ' + formatError(value);
  }

  if (keys.length === 0 && (!array || value.length == 0)) {
    return braces[0] + base + braces[1];
  }

  if (recurseTimes < 0) {
    if (isRegExp(value)) {
      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
    } else {
      return ctx.stylize('[Object]', 'special');
    }
  }

  ctx.seen.push(value);

  var output;
  if (array) {
    output = formatArray(ctx, value, recurseTimes, visibleKeys, keys);
  } else {
    output = keys.map(function(key) {
      return formatProperty(ctx, value, recurseTimes, visibleKeys, key, array);
    });
  }

  ctx.seen.pop();

  return reduceToSingleString(output, base, braces);
}


function formatPrimitive(ctx, value) {
  if (isUndefined(value))
    return ctx.stylize('undefined', 'undefined');
  if (isString(value)) {
    var simple = '\'' + JSON.stringify(value).replace(/^"|"$/g, '')
                                             .replace(/'/g, "\\'")
                                             .replace(/\\"/g, '"') + '\'';
    return ctx.stylize(simple, 'string');
  }
  if (isNumber(value))
    return ctx.stylize('' + value, 'number');
  if (isBoolean(value))
    return ctx.stylize('' + value, 'boolean');
  // For some reason typeof null is "object", so special case here.
  if (isNull(value))
    return ctx.stylize('null', 'null');
}


function formatError(value) {
  return '[' + Error.prototype.toString.call(value) + ']';
}


function formatArray(ctx, value, recurseTimes, visibleKeys, keys) {
  var output = [];
  for (var i = 0, l = value.length; i < l; ++i) {
    if (hasOwnProperty(value, String(i))) {
      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
          String(i), true));
    } else {
      output.push('');
    }
  }
  keys.forEach(function(key) {
    if (!key.match(/^\d+$/)) {
      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
          key, true));
    }
  });
  return output;
}


function formatProperty(ctx, value, recurseTimes, visibleKeys, key, array) {
  var name, str, desc;
  desc = Object.getOwnPropertyDescriptor(value, key) || { value: value[key] };
  if (desc.get) {
    if (desc.set) {
      str = ctx.stylize('[Getter/Setter]', 'special');
    } else {
      str = ctx.stylize('[Getter]', 'special');
    }
  } else {
    if (desc.set) {
      str = ctx.stylize('[Setter]', 'special');
    }
  }
  if (!hasOwnProperty(visibleKeys, key)) {
    name = '[' + key + ']';
  }
  if (!str) {
    if (ctx.seen.indexOf(desc.value) < 0) {
      if (isNull(recurseTimes)) {
        str = formatValue(ctx, desc.value, null);
      } else {
        str = formatValue(ctx, desc.value, recurseTimes - 1);
      }
      if (str.indexOf('\n') > -1) {
        if (array) {
          str = str.split('\n').map(function(line) {
            return '  ' + line;
          }).join('\n').substr(2);
        } else {
          str = '\n' + str.split('\n').map(function(line) {
            return '   ' + line;
          }).join('\n');
        }
      }
    } else {
      str = ctx.stylize('[Circular]', 'special');
    }
  }
  if (isUndefined(name)) {
    if (array && key.match(/^\d+$/)) {
      return str;
    }
    name = JSON.stringify('' + key);
    if (name.match(/^"([a-zA-Z_][a-zA-Z_0-9]*)"$/)) {
      name = name.substr(1, name.length - 2);
      name = ctx.stylize(name, 'name');
    } else {
      name = name.replace(/'/g, "\\'")
                 .replace(/\\"/g, '"')
                 .replace(/(^"|"$)/g, "'");
      name = ctx.stylize(name, 'string');
    }
  }

  return name + ': ' + str;
}


function reduceToSingleString(output, base, braces) {
  var numLinesEst = 0;
  var length = output.reduce(function(prev, cur) {
    numLinesEst++;
    if (cur.indexOf('\n') >= 0) numLinesEst++;
    return prev + cur.replace(/\u001b\[\d\d?m/g, '').length + 1;
  }, 0);

  if (length > 60) {
    return braces[0] +
           (base === '' ? '' : base + '\n ') +
           ' ' +
           output.join(',\n  ') +
           ' ' +
           braces[1];
  }

  return braces[0] + base + ' ' + output.join(', ') + ' ' + braces[1];
}


// NOTE: These type checking functions intentionally don't use `instanceof`
// because it is fragile and can be easily faked with `Object.create()`.
function isArray(ar) {
  return Array.isArray(ar);
}
exports.isArray = isArray;

function isBoolean(arg) {
  return typeof arg === 'boolean';
}
exports.isBoolean = isBoolean;

function isNull(arg) {
  return arg === null;
}
exports.isNull = isNull;

function isNullOrUndefined(arg) {
  return arg == null;
}
exports.isNullOrUndefined = isNullOrUndefined;

function isNumber(arg) {
  return typeof arg === 'number';
}
exports.isNumber = isNumber;

function isString(arg) {
  return typeof arg === 'string';
}
exports.isString = isString;

function isSymbol(arg) {
  return typeof arg === 'symbol';
}
exports.isSymbol = isSymbol;

function isUndefined(arg) {
  return arg === void 0;
}
exports.isUndefined = isUndefined;

function isRegExp(re) {
  return isObject(re) && objectToString(re) === '[object RegExp]';
}
exports.isRegExp = isRegExp;

function isObject(arg) {
  return typeof arg === 'object' && arg !== null;
}
exports.isObject = isObject;

function isDate(d) {
  return isObject(d) && objectToString(d) === '[object Date]';
}
exports.isDate = isDate;

function isError(e) {
  return isObject(e) &&
      (objectToString(e) === '[object Error]' || e instanceof Error);
}
exports.isError = isError;

function isFunction(arg) {
  return typeof arg === 'function';
}
exports.isFunction = isFunction;

function isPrimitive(arg) {
  return arg === null ||
         typeof arg === 'boolean' ||
         typeof arg === 'number' ||
         typeof arg === 'string' ||
         typeof arg === 'symbol' ||  // ES6 symbol
         typeof arg === 'undefined';
}
exports.isPrimitive = isPrimitive;

exports.isBuffer = require('./support/isBuffer');

function objectToString(o) {
  return Object.prototype.toString.call(o);
}


function pad(n) {
  return n < 10 ? '0' + n.toString(10) : n.toString(10);
}


var months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep',
              'Oct', 'Nov', 'Dec'];

// 26 Feb 16:19:34
function timestamp() {
  var d = new Date();
  var time = [pad(d.getHours()),
              pad(d.getMinutes()),
              pad(d.getSeconds())].join(':');
  return [d.getDate(), months[d.getMonth()], time].join(' ');
}


// log is just a thin wrapper to console.log that prepends a timestamp
exports.log = function() {
  console.log('%s - %s', timestamp(), exports.format.apply(exports, arguments));
};


/**
 * Inherit the prototype methods from one constructor into another.
 *
 * The Function.prototype.inherits from lang.js rewritten as a standalone
 * function (not on Function.prototype). NOTE: If this file is to be loaded
 * during bootstrapping this function needs to be rewritten using some native
 * functions as prototype setup using normal JavaScript does not work as
 * expected during bootstrapping (see mirror.js in r114903).
 *
 * @param {function} ctor Constructor function which needs to inherit the
 *     prototype.
 * @param {function} superCtor Constructor function to inherit prototype from.
 */
exports.inherits = require('inherits');

exports._extend = function(origin, add) {
  // Don't do anything if add isn't an object
  if (!add || !isObject(add)) return origin;

  var keys = Object.keys(add);
  var i = keys.length;
  while (i--) {
    origin[keys[i]] = add[keys[i]];
  }
  return origin;
};

function hasOwnProperty(obj, prop) {
  return Object.prototype.hasOwnProperty.call(obj, prop);
}

}).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"./support/isBuffer":102,"_process":83,"inherits":101}]},{},[1]);