Example REPL using async/await and util.promisify

async-promisify-example.js

// use 'AsyncFunction' option

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

const writeFilePromise = promisify(fs.writeFile);
const readFilePromise = promisify(fs.readFile);

const filename = '/sv/clients/norway/test.txt';

// write some text to a file
await writeFilePromise(filename, `It is currently ${new Date()}.`);

// read the text from the same file
return await readFilePromise(filename, 'utf-8');