Deferred.js

/**
 * Creates a promise that can be resolved from the outside.
 * @property {function} resolve - resolves the promise
 * @property {function} reject - rejects the promise
 */
class Deferred extends Promise {
	constructor() {
		var _resolve, _reject;
		super((resolve, reject) => {
			_resolve = resolve;
			_reject = reject;
		})
		
		this.resolve = _resolve;
		this.reject = _reject;
	}
}