Package Exports
- promise-polyfill
This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (promise-polyfill) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.
Readme
# Promise
[![travis][travis-image]][travis-url]
Lightweight ES6 Promise polyfill for the browser and node. Adheres closely to the spec. It is a perfect polyfill IE, Firefox or any other browser that does not support native promises.
This implementation is based on then/promise. It has been changed to use the prototype for performance and memory reasons.
For API information about Promises, please check out this article HTML5Rocks article.
It is extremely lightweight. < 1kb Gzipped
Browser Support
IE8+, Chrome, Firefox, IOS 4+, Safari 5+, Opera
Downloads
Node
npm install promise-polyfillBower
bower install promise-polyfillSimple use
var prom = new Promise(function(resolve, reject) {
// do a thing, possibly async, then…
if (/* everything turned out fine */) {
resolve("Stuff worked!");
} else {
reject(new Error("It broke"));
}
});
// Do something when async done
prom.then(function() {
...
});Performance
By default promise-polyfill uses setImmediate, but falls back to setTimeout for executing asynchronously. If a browser does not support setImmediate, you may see performance issues.
Use a setImmediate polyfill to fix this issue. setAsap or setImmediate work well.
If you polyfill window.setImmediate or use Promise._setImmediateFn(immedateFn) it will be used instead of window.setTimeout
Testing
npm install
npm testLicense
MIT