98 lines
3.2 KiB
Markdown
98 lines
3.2 KiB
Markdown
# ES6-Promise (subset of [rsvp.js](https://github.com/tildeio/rsvp.js)) [](https://travis-ci.org/stefanpenner/es6-promise)
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This is a polyfill of the [ES6 Promise](http://www.ecma-international.org/ecma-262/6.0/#sec-promise-constructor). The implementation is a subset of [rsvp.js](https://github.com/tildeio/rsvp.js) extracted by @jakearchibald, if you're wanting extra features and more debugging options, check out the [full library](https://github.com/tildeio/rsvp.js).
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For API details and how to use promises, see the <a href="http://www.html5rocks.com/en/tutorials/es6/promises/">JavaScript Promises HTML5Rocks article</a>.
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## Downloads
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* [es6-promise 27.86 KB (7.33 KB gzipped)](https://cdn.jsdelivr.net/npm/es6-promise/dist/es6-promise.js)
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* [es6-promise-auto 27.78 KB (7.3 KB gzipped)](https://cdn.jsdelivr.net/npm/es6-promise/dist/es6-promise.auto.js) - Automatically provides/replaces `Promise` if missing or broken.
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* [es6-promise-min 6.17 KB (2.4 KB gzipped)](https://cdn.jsdelivr.net/npm/es6-promise/dist/es6-promise.min.js)
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* [es6-promise-auto-min 6.19 KB (2.4 KB gzipped)](https://cdn.jsdelivr.net/npm/es6-promise/dist/es6-promise.auto.min.js) - Minified version of `es6-promise-auto` above.
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## CDN
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To use via a CDN include this in your html:
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```html
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<!-- Automatically provides/replaces `Promise` if missing or broken. -->
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<script src="https://cdn.jsdelivr.net/npm/es6-promise@4/dist/es6-promise.js"></script>
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<script src="https://cdn.jsdelivr.net/npm/es6-promise@4/dist/es6-promise.auto.js"></script>
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<!-- Minified version of `es6-promise-auto` below. -->
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<script src="https://cdn.jsdelivr.net/npm/es6-promise@4/dist/es6-promise.min.js"></script>
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<script src="https://cdn.jsdelivr.net/npm/es6-promise@4/dist/es6-promise.auto.min.js"></script>
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```
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## Node.js
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To install:
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```sh
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yarn add es6-promise
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```
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or
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```sh
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npm install es6-promise
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```
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To use:
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```js
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var Promise = require('es6-promise').Promise;
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```
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## Usage in IE<9
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`catch` and `finally` are reserved keywords in IE<9, meaning
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`promise.catch(func)` or `promise.finally(func)` throw a syntax error. To work
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around this, you can use a string to access the property as shown in the
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following example.
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However most minifiers will automatically fix this for you, making the
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resulting code safe for old browsers and production:
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```js
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promise['catch'](function(err) {
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// ...
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});
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```
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```js
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promise['finally'](function() {
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// ...
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});
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```
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## Auto-polyfill
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To polyfill the global environment (either in Node or in the browser via CommonJS) use the following code snippet:
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```js
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require('es6-promise').polyfill();
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```
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Alternatively
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```js
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require('es6-promise/auto');
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```
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Notice that we don't assign the result of `polyfill()` to any variable. The `polyfill()` method will patch the global environment (in this case to the `Promise` name) when called.
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## Building & Testing
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You will need to have PhantomJS installed globally in order to run the tests.
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`npm install -g phantomjs`
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* `npm run build` to build
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* `npm test` to run tests
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* `npm start` to run a build watcher, and webserver to test
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* `npm run test:server` for a testem test runner and watching builder
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