A simple way to do a deferred or inside-out promise.

DeferredPromise.ts

interface IDeferredPromise<T> {
    resolve: (T) => void,
    reject: (T) => void,
    promise: Promise<T>,
}

function DeferredPromise<T>(): IDeferredPromise<T> {
    this.promise = new Promise<T>((resolve, reject) => {
	    this.resolve = resolve;
	    this.reject = reject;
    });
    return this;
}