ts-promisify-callback

Turns any function ending with the "popular" (Error, Result) callback format into a Promise. Type-safe!

Install

npm install ts-promisify-callback

Usage

IMPORTANT: This library requires typescript@^4.0 (currently in beta)!

import { promisifyCallback } from "ts-promisify-callback";
 
function helloWithCallback(
  name: string,
  age: number,
  cb: (err: Error | null, result: string) => void
) {
  cb(null, `I'm ${name}, age ${age}`);
}
 
let helloAsPromise = promisifyCallback(helloWithCallback);
// let helloAsPromise: (name: string, age: number) => Promise<string>
 
(async () => {
  let greeting = await helloAsPromise("hello", 31);
  alert(greeting);
})();

Contributing

This is a very simple library, but I'm sure there are many ways to improve it to be more flexible...

Pull Requests Welcome!