<pre class="shiki github-dark shaku"><code>// please complete the implementationclass EventEmitter { constructor() { this.eventSubs = new Map(); } subscribe(eventName, callback) { const sub = new SubWatcher(eventName, callback); if (this.eventSubs.has(eventName)) { this.eventSubs.get(eventName).push(sub); } else { this.eventSubs.set(eventName, [sub]); } 	return sub; } emit(eventName, ...args) { 	let curSubs = this.eventSubs.get(eventName) || []; curSubs.forEach(sub =&gt; { !sub.isReleased &amp;&amp; sub.func(...args); }); }}class SubWatcher { constructor(evtName, func, isReleased = false) { this.evtName = evtName; this.func = func; this.isReleased = isReleased; } release() { this.isReleased = true; } activated() { this.isReleased = false; }}</code></pre>

Although my code has passed, could you please give me some recommendations? Thank you.

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