Demo waiting for a callback to finish in TypeScript

wait_for_callback_finish.ts

#! /usr/bin/env node
// Copyright (c) 2025 Sebastian Pipping <[email protected]>
// SPDX-License-Identifier: 0BSD

function callCallbackSomeTime(callback: () => void): void {
  setTimeout(function () {
    callback();
  }, 2000);
}

function actualCallback() {
  console.log("Inside callback");
}

async function asyncMain() {
  console.log("Before callback");

  await new Promise<void>((resolve) => {
    callCallbackSomeTime(function () {
      actualCallback();
      resolve();
    });

    console.log("Waiting for callback to finish...");
  });

  console.log("After callback");
}

asyncMain();