util.promisify usage with async

promisify-async.js

const {promisify} = require('util');
const fs = require('fs');
const readFile = promisify(fs.readFile);

// await can only be used within an async function
(async () => {
    try {
        const fileContents = await readFile('./foo.txt');
        console.log(fileContents.toString());
    } catch (ex) {
        ex => console.error(error)
    }
})();