<pre class="shiki github-dark shaku"><code>class Subscription { constructor(eventName, callback, map) { this.eventName = eventName; this.callback = callback; this.map = map; } release() { const values = this.map.get(this.eventName); const index = values.indexOf(this); values.splice(index, 1); this.map.set(this.eventName, values); } invoke(...args) { this.callback(...args); }}// please complete the implementationclass EventEmitter { constructor() { this.eventToCallbackMap = new Map(); } subscribe(eventName, callback) { const sub = new Subscription(eventName, callback, this.eventToCallbackMap); const currentCallbacks = this.eventToCallbackMap.get(eventName); if (currentCallbacks) { this.eventToCallbackMap.set(eventName, [...currentCallbacks, sub]); } else { 	 this.eventToCallbackMap.set(eventName, [sub]); } return sub; } emit(eventName, ...args) { 	this.eventToCallbackMap.get(eventName)?.forEach(sub =&gt; sub.invoke(...args)); }}</code></pre>

This is my accepted solution

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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…