javascript make callback asynchronous code example

Example 1: tesseract Calling an asynchronous function without callback is deprecated.

In node-tesseract's folder modify tesseract.js:

Before:
fs.unlink(files[0]);
Now:
fs.unlink(files[0], err => { if (err) console.log(err) });

Example 2: await callback

function apiOn(event) {
  return new Promise(resolve => {
    api.on(event, response => resolve(response));
  });
}