Ionic build with Browserify, development & production builds with sass, es6 transpiling, minification and more. Standard JS, no semicolons.

appconfig.js

module.exports = {
  default: {
    // versionify will replace the following string with the actual version number
    BUILD_VERSION: '__VERSION__'
  },
  development: {
    API_URL: 'http://localhost:3000'
  },
  production: {
    API_URL: 'http://acme.com'
  }
}

gulpfile.js

/*
 * Ionic build with Browserify, development & production builds with sass,
 * es6 transpiling, minification and more. Standard JS, no semicolons
 * 
 * alex.escalante@gmail.com
 */

'use strict'

let gulp = require('gulp')
let path = require('path')
let del = require('del')
let sass = require('gulp-sass')
let minifyCss = require('gulp-clean-css')
let rename = require('gulp-rename')
let eslint = require('gulp-standard')
let browserify = require('browserify')
let vinylSource = require('vinyl-source-stream')
let minimist = require('minimist')
let ngConstant = require('gulp-ng-constant')
let insert = require('gulp-insert')
let exorcist = require('exorcist')

require('browserify-ngannotate')
require('browserify-versionify')

/*
 * Configuration
 */

const paths = {
  // your sass
  sass: ['./app/scss/**/*.scss'],
  // and it's css
  css: './www/css',
  // your javascript files
  js: ['./app/js/**/*.js'],
  // your entry point
  appjs: './app/js/app.js',
  // your bower components
  bowerComponents: 'www/lib',
  // and your bundle goes into…
  dist: './www/dist'
}

/*
 * Config module
 *
 * You get a free angular module with your own config constants
 * see config() below
 */
const configModule = 'cruise.config'
const configConstants = require('./appconfig')

/*
 * Configuration ends here
 */

// Handle command line options to allow production settings
let knownOptions = {
  boolean: 'production',
  default: { production: false }
}
let options = minimist(process.argv.slice(2), knownOptions)

// Generate an angular module with constants according to your configuration
function config () {
  let constants = Object.assign(configConstants['default'], configConstants[options.production ? 'production' : 'development'])
  return ngConstant({
    name: configModule,
    constants: constants,
    stream: true,
    wrap: 'commonjs'
  })
    .pipe(rename('config.js'))
    .pipe(insert.prepend(['/* global angular */', '/* eslint quotes: 0, semi: 0 */'].join('\n')))
    .pipe(gulp.dest('app/js/'))
}

// Make sure your code follows the standard
function lint () {
  return gulp.src(paths.js)
    .pipe(eslint())
    .pipe(eslint.reporter('default', {
      breakOnError: true
    }))
}

function bundleForDevelopment () {
  return browserify(paths.appjs, {debug: true})
    .transform('browserify-versionify', {
      placeholder: '__VERSION__'
    })
    .transform('babelify', {presets: ['es2015'], ignore: paths.bowerComponents})
    .transform('debowerify')
    .bundle()
    .pipe(exorcist(path.join(paths.dist, 'bundle.js.map')))
    .on('error', function (err) {
      console.error(err)
      this.emit('end')
    })
    .pipe(vinylSource('bundle.js'))
    .pipe(gulp.dest(paths.dist))
}

function bundleForProduction () {
  return browserify(paths.appjs, {debug: false})
    .transform('browserify-versionify', {
      placeholder: '__VERSION__'
    })
    .transform('babelify', {presets: ['es2015'], ignore: paths.bowerComponents, sourceMaps: false})
    .transform('debowerify')
    .transform('browserify-ngannotate')
    .transform({global: true}, 'uglifyify')
    .bundle()
    .on('error', function (err) {
      console.error(err)
      this.emit('end')
    })
    .pipe(vinylSource('bundle.js'))
    .pipe(gulp.dest(paths.dist))
}

function bundle () {
  console.log('bundling for', options.production ? 'production' : 'development')
  return del(path.join(paths.dist, '*')).then(function () {
    if (options.production) {
      return bundleForProduction()
    } else {
      return bundleForDevelopment()
    }
  })
}

function styles () {
  return gulp.src(paths.sass)
    .pipe(sass())
    .on('error', sass.logError)
    .pipe(gulp.dest(paths.css))
    .pipe(minifyCss({
      keepSpecialComments: 0
    }))
    .pipe(rename({ extname: '.css' }))
    .pipe(gulp.dest(paths.css))
}

function watch () {
  gulp.watch(paths.sass, ['styles'])
  gulp.watch(paths.js, ['bundle'])
}

gulp.task('default', ['styles', 'bundle'])
gulp.task('styles', styles)
gulp.task('config', config)
gulp.task('lint', ['config'], lint)
gulp.task('bundle', ['lint'], bundle)
gulp.task('watch', watch)