promise-based node exec with stdout logging

node-exec.js

const { spawn } = require('child_process');

const exec = (command, args = []) => {
  return new Promise((resolve, reject) => {
    console.log('');
    console.log(`${command} ${args.join(' ')}`);

    const proc = spawn(command, args);
    proc.stdout.pipe(process.stdout);
    proc.stderr.pipe(process.stderr);

    const stdout = [];
    proc.stdout.on('data', (data) => {
      stdout.push(data.toString().trim());
    });

    const stderr = [];
    proc.stderr.on('data', (data) => {
      stderr.push(data.toString().trim());
    });

    proc.on('close', (code) => {
      const result = { command, args, stdout, stderr, code };
      return code === 0 ? resolve(result) : reject(result);
    });
  });
};