export interface Deferred {
  promise: Promise<unknown>;
  resolve(value: unknown): void;
  reject(value: unknown): void;
}

export function createDeferred(): Deferred {
  let resolve: Deferred['resolve'];
  let reject: Deferred['reject'];
  return {
    promise: new Promise<unknown>((res, rej) => {
      resolve = res;
      reject = rej;
    }),
    resolve(value): void {
      resolve(value);
    },
    reject(value): void {
      reject(value);
    },
  };
}