tweb-i2p/src/helpers/callbackify.ts

/*
 * https://github.com/morethanwords/tweb
 * Copyright (C) 2019-2021 Eduard Kuzmenko
 * https://github.com/morethanwords/tweb/blob/master/LICENSE
 */

import {Awaited} from '../types';

export default function callbackify<T extends Awaited<any>, R>(
  smth: T, 
  callback: (result: Awaited<T>) => R
): PromiseLike<R> | R {
  if(smth instanceof Promise) {
    return smth.then(callback);
  } else {
    return callback(smth as any);
  }
}