Promise.deferを書いてたときにcoffeeの変数宣言で泣いた

01.coffee

# Promise.deferが欲しかったので適当に書いてみる
# @deferの先頭でresolve, rejectの変数宣言をしたかった

# we want Promise.defer!!
`if (typeof define !== 'function') { var define = require('amdefine')(module) } // for node`
define [
  'es6-promise'
], (es6Promise) ->
  'use strict'
  class Promise extends es6Promise.Promise
    @defer: () ->
      resolve
      reject
      promise = new es6Promise.Promise (res, rej) ->
        resolve = res
        reject = rej
        return
      {
        promise: promise
        resolve: resolve
        reject: reject
      }

02.js

// Generated by CoffeeScript 1.7.1
(function() {
  if (typeof define !== 'function') { var define = require('amdefine')(module) } // for node;
  var __hasProp = {}.hasOwnProperty,
    __extends = function(child, parent) { for (var key in parent) { if (__hasProp.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; };

  define(['es6-promise'], function(es6Promise) {
    'use strict';
    var Promise;
    return Promise = (function(_super) {
      __extends(Promise, _super);

      function Promise() {
        return Promise.__super__.constructor.apply(this, arguments);
      }

      Promise.defer = function() {
        resolve;
        reject;
        var promise;
        promise = new es6Promise.Promise(function(res, rej) {
          var reject, resolve;
          resolve = res;
          reject = rej;
        });
        return {
          promise: promise,
          resolve: resolve,
          reject: reject
        };
      };

      return Promise;

    })(es6Promise.Promise);
  });

}).call(this);

03.coffee

# defer先頭で適当に代入する形

# we want Promise.defer!!
`if (typeof define !== 'function') { var define = require('amdefine')(module) } // for node`
define [
  'es6-promise'
], (es6Promise.Promise) ->
  'use strict'
  class Promise extends es6Promise.Promise
    @defer: () ->
      resolve = 'yadayada'
      reject = 'yadayada'
      promise = new es6Promise.Promise (res, rej) ->
        resolve = res
        reject = rej
        return
      {
        promise: promise
        resolve: resolve
        reject: reject
      }

04.js

// Generated by CoffeeScript 1.7.1
(function() {
  if (typeof define !== 'function') { var define = require('amdefine')(module) } // for node;
  var __hasProp = {}.hasOwnProperty,
    __extends = function(child, parent) { for (var key in parent) { if (__hasProp.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; };

  define(['es6-promise'], function(es6Promise) {
    'use strict';
    var Promise;
    return Promise = (function(_super) {
      __extends(Promise, _super);

      function Promise() {
        return Promise.__super__.constructor.apply(this, arguments);
      }

      Promise.defer = function() {
        var promise, reject, resolve;
        resolve = 'yadayada';
        reject = 'yadayada';
        promise = new es6Promise.Promise(function(res, rej) {
          resolve = res;
          reject = rej;
        });
        return {
          promise: promise,
          resolve: resolve,
          reject: reject
        };
      };

      return Promise;

    })(es6Promise.Promise);
  });

}).call(this);