const { EventEmitter } = require('node:events');

const emitter = new EventEmitter();

emitter.on('userLoggedIn', (username) => {
  console.log(`Welcome back, ${username}!`);
});

emitter.on('userLoggedIn', (username) => {
  console.log(`Audit log: ${username} logged in at ${new Date().toISOString()}`);
});

emitter.emit('userLoggedIn', 'alice');
// Welcome back, alice!
// Audit log: alice logged in at 2026-...