events.js

const EventEmitter = require('events');

const myEmitter = new EventEmitter();

function handler1() {
    console.log('first handler');
    myEmitter.removeListener('event', handler2);
}

function handler2() {
    console.log('second handler');
}

myEmitter.on('event', handler1);

myEmitter.on('event', handler2);

myEmitter.emit('event');
myEmitter.emit('event');

// EXPECTED
// first handler
// first handler

// ACTUAL
// first handler
// second handler
// first handler