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index.js
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index.js
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/*!
* native-promise-deferred <https://github.com/tunnckoCore/native-promise-deferred>
*
* Copyright (c) Charlike Mike Reagent <@tunnckoCore> (https://i.am.charlike.online)
* Released under the MIT license.
*/
'use strict'
var extend = require('extend-shallow')
var Promize = require('native-or-another')
var register = require('native-or-another/register')
/**
* > Acts and works like a `Promise` constructor, but instead
* of accepting `resolver` function like `function (resolve, reject) {}` it
* accepts an `options` optional object that is allows
* you to pass custom Promise constructor for `options.Promise` when
* there's no support for native promise in the used environment.
*
* **Example**
*
* ```js
* const Deferred = require('native-promise-deferred')
*
* const promise = new Deferred()
*
* promise.then((res) => {
* console.log('result:', res) // => 123
* })
* promise.resolve(123)
*
* // or passing custom promise
* // for nodejs < v0.12 where no native promise support
*
* const Bluebird = require('bluebird')
* const customPromise = new Deferred({ Promise: Bluebird })
*
* customPromise.catch((er) => console.log('ERR!', er))
* // => ERR! Error: foo bar
*
* customPromise.reject(new Error('foo bar'))
* ```
*
* @name Deferred
* @param {Object} `options` directly passed to [native-or-another][]'s "register"
* @param {Boolean} `options.global` pass `false` to disable registering it as `global.Promise`
* @return {Promise} a standard Promise object with `.resolve` and `.reject` methods
* @api public
*/
module.exports = function Deferred (options) {
options = extend({ Promise: Promize }, options)
options.Promise = register(options)
var promise = {}
var p = new options.Promise(function (resolve, reject) {
promise.resolve = resolve
promise.reject = reject
})
return extend(p, promise)
}