export { promisify } from 'util';

// /**
//  * Transforms callback-based function -- func(arg1, arg2 .. argN, callback) -- into an ES6-compatible Promise.
//  * Promisify provides a default callback of the form (error, result) and rejects when `error` is not null. You can also
//  * supply thisArg object as the second argument which will be passed to `apply`.
//  */
// // HACK: This can't be properly typed without variadic kinds https://github.com/Microsoft/TypeScript/issues/5453
// export function promisify<T>(originalFn: (...args: any[]) => void, thisArg?: any): (...callArgs: any[]) => Promise<T> {
//     const promisifiedFunction = async (...callArgs: any[]): Promise<T> => {
//         return new Promise<T>((resolve, reject) => {
//             const callback = (err: Error | null, data?: T) => {
//                 err === null || err === undefined ? resolve(data) : reject(err);
//             };
//             originalFn.apply(thisArg, [...callArgs, callback]);
//         });
//     };
//     return promisifiedFunction;
// }