https://github.com/lahmatiy/es6-promise-polyfill

ES6 Promise polyfill
https://github.com/lahmatiy/es6-promise-polyfill

es2015 es6 polyfill promise

Last synced: 6 days ago
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ES6 Promise polyfill

• Host: GitHub
• URL: https://github.com/lahmatiy/es6-promise-polyfill
• Owner: lahmatiy
• License: mit
• Created: 2014-06-19T10:42:05.000Z (over 10 years ago)
• Default Branch: master
• Last Pushed: 2017-01-13T22:19:33.000Z (almost 8 years ago)
• Last Synced: 2024-12-07T13:11:44.572Z (15 days ago)
• Topics: es2015, es6, polyfill, promise
• Language: JavaScript
• Size: 15.6 KB
• Stars: 107
• Watchers: 7
• Forks: 68
• Open Issues: 3
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md
  • License: LICENSE

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# ES6 Promise polyfill

This is a polyfill of [ES6 Promise](https://github.com/domenic/promises-unwrapping). The implementation based on [Jake Archibald implementation](https://github.com/jakearchibald/es6-promise) a subset of [rsvp.js](https://github.com/tildeio/rsvp.js). If you're wanting extra features and more debugging options, check out the [full library](https://github.com/tildeio/rsvp.js).

For API details and how to use promises, see the JavaScript Promises HTML5Rocks article.

## Notes

The main target: implementation should be conformance with browser's implementations and to be minimal as possible in size. So it's strictly polyfill of ES6 Promise specification and nothing more.

It passes both [Promises/A+ test suite](https://github.com/promises-aplus/promises-tests) and [rsvp.js test suite](https://github.com/jakearchibald/es6-promise/tree/master/test). And as small as 2,6KB min (or 1KB min+gzip).

The polyfill uses `setImmediate` if available, or fallback to use `setTimeout`. Use [setImmediate polyfill](https://github.com/YuzuJS/setImmediate) by @YuzuJS to reach better performance.

## How to use

### Browser

To install:

```sh

bower install es6-promise-polyfill

```

To use:

```html

  var promise = new Promise(...);

```

### Node.js

To install:

```sh

npm install es6-promise-polyfill

```

To use:

```js

var Promise = require('es6-promise-polyfill').Promise;

var promise = new Promise(...);

```

### AMD

To install:

```sh

npm install es6-promise-polyfill

```

To use:

```js

define(['es6-promise-polyfill'], function(Promise) {

  var promise = new Promise(...);

});

```

## Usage in IE<9

`catch` is a reserved word in IE<9, meaning `promise.catch(func)` throws a syntax error. To work around this, use a string to access the property:

```js

promise['catch'](function(err) {

  // ...

});

```

Or use `.then` instead:

```js

promise.then(undefined, function(err) {

  // ...

});

```

## License

Licensed under the MIT License.