promisify

A simple Deno module for promisifying callback-based functions.

Usage

First, import the module from the Deno Third-Party Modules Registry. After that, you can import the promisify utility function.

import { promisify } from "https://deno.land/x/promisify/mod.ts";

function add(a: number, b: number, cb: (sum: number) => void) {
  cb(a + b);
}

const sum = await promisify(add)(3, 5);
console.log(sum); // 8

function getItems(cb: (items: unknown[]) => void) {
  throw Error("Unexpected.");
}

const items = await promisify(getItems)().catch((err) => {
  console.error(err); // logs out the error because the function threw an error
});
console.log(items); // undefined

License

Unlicense