Acme.BookStore.HttpApi.Host/node_modules/y18n/index.js

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var fs = require('fs')
var path = require('path')
var util = require('util')

function Y18N (opts) {
  // configurable options.
  opts = opts || {}
  this.directory = opts.directory || './locales'
  this.updateFiles = typeof opts.updateFiles === 'boolean' ? opts.updateFiles : true
  this.locale = opts.locale || 'en'
  this.fallbackToLanguage = typeof opts.fallbackToLanguage === 'boolean' ? opts.fallbackToLanguage : true

  // internal stuff.
  this.cache = {}
  this.writeQueue = []
}

Y18N.prototype.__ = function () {
  var args = Array.prototype.slice.call(arguments)
  var str = args.shift()
  var cb = function () {} // start with noop.

  if (typeof args[args.length - 1] === 'function') cb = args.pop()
  cb = cb || function () {} // noop.

  if (!this.cache[this.locale]) this._readLocaleFile()

  // we've observed a new string, update the language file.
  if (!this.cache[this.locale][str] && this.updateFiles) {
    this.cache[this.locale][str] = str

    // include the current directory and locale,
    // since these values could change before the
    // write is performed.
    this._enqueueWrite([this.directory, this.locale, cb])
  } else {
    cb()
  }

  return util.format.apply(util, [this.cache[this.locale][str] || str].concat(args))
}

Y18N.prototype._enqueueWrite = function (work) {
  this.writeQueue.push(work)
  if (this.writeQueue.length === 1) this._processWriteQueue()
}

Y18N.prototype._processWriteQueue = function () {
  var _this = this
  var work = this.writeQueue[0]

  // destructure the enqueued work.
  var directory = work[0]
  var locale = work[1]
  var cb = work[2]

  var languageFile = this._resolveLocaleFile(directory, locale)
  var serializedLocale = JSON.stringify(this.cache[locale], null, 2)

  fs.writeFile(languageFile, serializedLocale, 'utf-8', function (err) {