deferred.ts

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

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