eprom

 

eprom is an enhanced promise implementation. It works by wrapping a globally available Promise class and is as compliant with the Promises/A+ spec as the global Promise is.

In addition to the usual then, call and finally instance methods, it provides resolve and reject methods. In this regard, it resembles jQuery's Deferred object. On top of that, it features a reset method that enables repeat fulfillment.

Installation

Using NPM:

npm install -S eprom

Using Yarn:

yarn add eprom

API

eprom's EnhancedPromise mimics more usual Promises in every way. As such, it provides all class (resolve, reject, all, race) and instance (then, catch, finally) methods these provide.

enhancedPromise.resolve(value)

This method resolves an EnhancedPromise's inner Promise, triggering the execution of all onFulfilled handlers.

const enhancedPromise = new EnhancedPromise();
enhancedPromise.then(value => console.log(value));
enhancedPromise.resolve('foo');
// logs 'foo'

enhancedPromise.reject(reason)

This method rejects an EnhancedPromise's inner Promise, triggering the execution of all onRejected handlers.

const enhancedPromise = new EnhancedPromise();
enhancedPromise.catch(reason => console.err(reason));
enhancedPromise.reject('bar');
// logs 'bar'

enhancedPromise.reset()

This method creates a fresh inner Promise and thus allows for the re-fulfillment of an EnhancedPromise. A typical use case for this is handling repeat builds triggered by Webpack in watch mode.

const enhancedPromise = new EnhancedPromise();

enhancedPromise.then(value => console.log(value));
enhancedPromise.resolve('foo');
// logs 'foo'

enhancedPromise.reset();

enhancedPromise.then(value => console.log(value));
enhancedPromise.resolve('bar');
// logs 'bar'