fs.read promisified version

fs-read-promisify-test.js

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

const readPromisified = promisify(read);
const openPromisified = promisify(open);

const expected = Buffer.from('xyz\n');
const buffer = Buffer.allocUnsafe(expected.length);

openPromisified('x.txt', 'r').then(fd => {
  readPromisified(fd, buffer, 0, expected.length, 0).then(obj => {
    console.log(obj);
    // { bytesRead: 3, buffer: <Buffer 78 79 7a 03> }
  });
});