<pre class="shiki github-dark shaku"><code>class EventEmitter { constructor() { this.events = {}; } subscribe(eventName, callback) { this.events[eventName] = this.events[eventName] || []; this.events[eventName].push(callback); return { release: () =&gt; this.events[eventName].pop(), } } emit(eventName, ...args) { 	if (this.events[eventName]) { this.events[eventName].forEach(cb =&gt; cb(...args)); } }}</code></pre>

with pop() method

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There is Event Emitter in Node.js, Facebook once had its own implementation but now it is archived. You are asked to create an Event Emitter Class con…