lie is a small, performant promise library implementing the Promises/A+ spec (Version 1.1).
Originally a fork of Ruben Verborgh's promiscuous, with version 2.6 it became a fork of ayepromise by Chris Burgmer.
npm install lie
var Promise = require('lie');
// or use the pollyfill
require('lie/polyfill');Either use it with browserify (recommended) or grab one of the files from the dist folder:
- lie.js/lie.min.js exposes 'Promise' either as a UMD module or from the global scope, depending on if a CJS or AMD loader is available.
- lie.polyfill.js/lie.polyfill.min.js adds 'Promise' to the global scope only if it's not already defined (not a UMD).
Implements the standard ES6 api:
new Promise(function(resolve, reject){
doSomething(function(err, result) {
if (err) {
reject(err);
} else {
resolve(result);
}
});
}).then(function (value) {
//on success
}, function (reason) {
//on error
}).catch(function (reason) {
//shortcut for error handling
});
Promise.all([
//array of promises or values
]).then(function ([/* array of results */]));
Promise.race([
//array of promises or values
]);
// either resolves or rejects depending on the first value to do soIn Node.js, lie emits an unhandledRejection event when a rejected promise isn't caught, in line with how io.js does it. This allows it to act as a promise shim in both Node.js and the browser.