enh(utils) refactor emitter to use Map and Set; update logging mechanism

lib/core/Emitter.js

@@ -1,7 +1,7 @@
 class Emitter {
 	#listeners;
 	constructor() {
-		this.#listeners = {};
+		this.#listeners = new Map();
 	}
 
 	/**
@@ -11,10 +11,10 @@ class Emitter {
 	 * @param {Function} callback - The callback function to be executed when the event is triggered.
 	 */
 	on(event, callback) {
-		if (!this.#listeners[event]) {
-			this.#listeners[event] = [];
+		if (!this.#listeners.has(event)) {
+			this.#listeners.set(event, new Set());
 		}
-		this.#listeners[event].push(callback);
+		this.#listeners.get(event).push(callback);
 	}
 
 	/**
@@ -25,28 +25,15 @@ class Emitter {
 	 * @param {Function} [callback] - The callback function to be removed.
 	 */
 	off(event, callback = undefined) {
-		if (typeof event != 'string') {
-			throw new TypeError('event must be a string');
-			return;
+		if (typeof event != 'string') return;
+
+		if (!this.#listeners.has(event)) return false;
+
+		if (!callback || this.#listeners.get(event).size === 0) {
+			return this.#listeners.delete(event);
 		}
 
-		if (
-			!Array.isArray(this.#listeners[event]) ||
-			this.#listeners[event].length === 0
-		) {
-			throw new TypeError(
-				`listener for \`${event}\` is not an array or empty`
-			);
-		}
-
-		if (!callback) {
-			this.#listeners[event] = undefined;
-			return;
-		}
-
-		this.#listeners[event] = this.#listeners[event].filter(
-			(listener) => listener !== callback
-		);
+		this.#listeners.get(event).delete(callback);
 	}
 
 	/**
@@ -56,11 +43,11 @@ class Emitter {
 	 * @param {...any} args - The arguments to pass to the event listeners.
 	 */
 	emit(event, ...args) {
-		if (!this.#listeners[event]) {
+		if (!this.#listeners.has(event)) {
 			return;
 		}
 
-		for (const callback of this.#listeners[event]) {
+		for (const callback of [...this.#listeners.get(event)]) {
 			callback(this, ...args);
 		}
 	}