valia/src/schema/managers/events.ts

A runtime data validator in TypeScript with advanced type inference, built-in validation functions, and seamless integration for server and client environments.

import type { Events } from "./types";

export function eventsManager() {
	return ({
		listeners: new Map<keyof Events, ((...args: any[]) => any)[]>(),
		on<K extends keyof Events>(event: K, callback: Events[K]) {
			if (!this.listeners.has(event)) {
				this.listeners.set(event, []);
			}
			this.listeners.get(event)!.push(callback);
		},
		emit<K extends keyof Events>(event: K, ...args: Parameters<Events[K]>) {
			const callbacks = this.listeners.get(event);
			if (!callbacks) return;
			for (const callback of callbacks) {
				callback(...args);
			}
		},
		off<K extends keyof Events>(event: K, callback: Events[K]) {
			const listeners = this.listeners.get(event);
			if (!listeners) return;
	
			const index = listeners.indexOf(callback);
			if (index !== -1) {
				listeners.splice(index, 1);
			}
		}
	});
}