export interface DeferredPromise<T> extends Promise<T> {
    resolve(value: T | PromiseLike<T>): void;
    reject(reason?: any): void;
}

export function createDeferredPromise<T = void>(): DeferredPromise<T> {
    let res: (value: T | PromiseLike<T>) => void;
    let rej: (reason?: any) => void;

    const promise = new Promise<T>((resolve, reject) => {
        res = resolve;
        rej = reject;
    }) as DeferredPromise<T>;

    promise.resolve = res!;
    promise.reject = rej!;

    return promise;
}