<pre class="shiki github-dark shaku"><code>// please complete the implementationclass EventEmitter { map = {}; subscribe(eventName, callback) { if(this.map[eventName]){ this.map[eventName].push(callback) } else { this.map[eventName] = [callback] } const release = () =&gt; { const callbacks = this.map[eventName]; if (!callbacks) return; const index = callbacks.indexOf(callback); if (index !== -1) { callbacks.splice(index, 1); } if (callbacks.length === 0) { delete this.map[eventName]; }; } return {release}; } emit(eventName, ...args) { 	if(this.map[eventName]){ this.map[eventName].forEach((callback) =&gt; { callback(...args); }) } }}</code></pre>

Simple Emitter class

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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…