export class Deferred<T = any> {
  promise: Promise<T>;
  _resolve: (value: T) => void;
  _reject: (...reason: any) => void;

  constructor() {
    this.promise = new Promise((resolve, reject) => {
      this._resolve = resolve;
      this._reject = reject;
    });
  }

  resolve(value) {
    this._resolve(value);
  }

  reject(reason) {
    this._reject(reason);
  }
}