test.js

const fs = require('fs');
const process = require('process');
const child_process = require('child_process');

/* watch current directory */
const x = fs.watch('.', (t, f) => {
  console.log(`eventType: ${t}, file: ${f}`)

  try {
    console.log(child_process.execSync(`ls -lah test.js`,  { encoding: 'utf-8' }))
  } catch (e) {
    // ignore error
  }
});

console.log('start watching')