Optimized watchify/browserify with gulp

options.js

/**
 * parses cli arguments as options
 */
var options = require("minimist")(process.argv.slice(2))
var defaults = {
    debug: true,
    plumber: true,
    minify: false
  }
// set some defaults options depending on some flags
if (options.production) {
  defaults.debug = false
  defaults.plumber = false
  defaults.minify = true
}

options.debug = options.debug === undefined ? defaults.debug : options.debug
options.plumber = options.plumber === undefined ? defaults.plumber : options.plumber
options.minify = options.minify === undefined ? defaults.minify : options.minify

module.exports = options

script.js

var gulp = require("gulp")
var util = require("gulp-util")
var plumber = require("gulp-plumber")
var tap = require("gulp-tap")

var opts = require("./options")

var bundler
module.exports = function() {
  gulp.src("./src/index.js", {read: false})
    .pipe(plumber(util.log))
    .pipe(tap(function(file) {
      if (!bundler) {
        bundler = require("browserify")({
          entries: [file.path],
          cache: {},
          packageCache: {},
          fullPaths: true,
          debug: opts.debug
        })
        if (opts.watch) {
          bundler = require("watchify")(bundler)
        }
        bundler
          .on("log", util.log)
          .on("update", function() {
            gulp.start("scripts")
          })
        addTransforms(bundler)
      }
      file.contents = bundler.bundle()
    }))
    .pipe(gulp.dest("./dist/"))
}

function addTransforms(bundler) {
  bundler.transform(require("reactify"))
  bundler.transform(require("es6ify"))
  if (opts.minify) {
    bundler.transform(require("uglifyify"))
  }
}