Browserify analyser

analyse.js

'use strict';
var fs = require('fs');
var vm = require('vm');

var filename = process.argv[process.argv.length - 1];

var fingerprint = '(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})';

var module_names = {
  1: filename
};

var sandbox = {
  exports: {},
  module: {
    exports: {}
  },
  _interceptor: function (modules) {
    return function () {
      var result = Object.keys(modules).map(function (id) {
        var module = modules[id];
        var fn = module[0];
        var deps = module[1];

        Object.keys(deps).forEach(function (name) {
          module_names[deps[name]] = name;
        });

        return {
          id: id,
          length: fn.toString().length
        };
      }).map(function (module) {
        module.name = module_names[module.id];

        return module;
      }).sort(function (a, b) {
        return a.length - b.length;
      });

      process.stdout.write(JSON.stringify(result, null, 2) + '\n');
    };
  }
};
vm.createContext(sandbox);


var file = fs.readFileSync(filename).toString('utf8');

var pos = file.indexOf(fingerprint);

if (~pos) {
  file = file.replace(fingerprint, '_interceptor');

  vm.runInContext(file, sandbox);
} else {
  throw new Error('Could not find a fingerprint');
}

Outputs a JSON serialized array of all the dependencies and their approximate length in utf8 characters

[
  {
    "id": "19",
    "length": 77,
    "name": "axios"
  },
  {
    "id": "18",
    "length": 88,
    "name": "https"
  },
  {
    "id": "17",
    "length": 106,
    "name": "http"
  },
  {
    "id": "42",
    "length": 164,
    "name": "querystring"
  },
  ...
  {
    "id": "45",
    "length": 15784,
    "name": "util"
  },
  {
    "id": "43",
    "length": 22294,
    "name": "url"
  },
  {
    "id": "32",
    "length": 28558,
    "name": "buffer"
  },
  {
    "id": "52",
    "length": 230082,
    "name": "lodash"
  }
]