Node.js run command in child process promise

cmd.js

const exec = require('child_process').exec;
const cmd = 'echo "hello"';

function echo() {
  return new Promise((resolve, reject) => {
    exec(cmd, (error, stdout, stderr) => {
      if (error) return resolve(false);
      if (stderr) return resolve(false);
      resolve(true);
    });
  });
}