export class Deferred<T> {
    resolve: (value: T | PromiseLike<T>) => void;
    reject: (reason?: any) => void;
    promise: Promise<T>;

    constructor() {
        this.resolve = () => {};
        this.reject = () => {};
        this.promise = new Promise<T>(
            (resolve: (value: T | PromiseLike<T>) => void, reject: (reason?: any) => void) => {
                this.resolve = resolve;
                this.reject = reject;
            }
        );
        Object.freeze(this);
    }
}