update_timezone_js

#!/usr/bin/env node

const fs = require('fs')
const path = require('path')
const UglifyJS = require('uglify-js')
const glob = require('glob')
const mkdirp = require('mkdirp')

const filesToIgnore = [
  'loaded.js',
  'locales.js',
  'rfc822.js',
  'synopsis.js',
  'zones.js',
]

const wrapTimezone = (code, timezoneName) => `
  !function(){
    ${code.replace('module.exports', 'var timezoneData')}
    if (typeof define === 'function' && define.amd) {
      define(timezoneData);
    } else {
      if (typeof __PRELOADED_TIMEZONE_DATA__ === 'undefined') {
        __PRELOADED_TIMEZONE_DATA__ = {};
      }
      __PRELOADED_TIMEZONE_DATA__['${timezoneName}'] = timezoneData;
    }
  }();
`

const processFile = (filename) => {
  let code = fs.readFileSync(`node_modules/timezone/${filename}`).toString()

  if (filename === 'index.js') {
    // include the root index.js as-is
  } else if (filename.match('/index.js')) {
    return // skip the ones that are for entire regions
  } else {
    const timezoneName = filename.replace(/\.js$/, '')
    code = UglifyJS.minify(wrapTimezone(code, timezoneName), {fromString: true}).code
  }

  const outputFileName = `public/javascripts/vendor/timezone/${filename}`
  mkdirp.sync(path.dirname(outputFileName))
  fs.writeFile(outputFileName, code)
}

glob
  .sync('**/*.js', {cwd: 'node_modules/timezone'})
  .filter(f => !filesToIgnore.includes(f))
  .forEach(processFile)