What is an Event Emitter in TypeScript?

Can you explain what an Event Emitter is in TypeScript?

An Event Emitter is a design pattern that allows objects to communicate with each other by emitting and listening for events.

How do I implement an Event Emitter in TypeScript?

You can create a class that uses an internal array to store listeners and methods to emit events and register listeners.

Can you show me a simple code example?

Sure! Here's a basic implementation:

class EventEmitter {
    private listeners: { [event: string]: Function[] } = {};

    on(event: string, listener: Function) {
        if (!this.listeners[event]) {
            this.listeners[event] = [];
        }
        this.listeners[event].push(listener);
    }

    emit(event: string, ...args: any[]) {
        if (this.listeners[event]) {
            this.listeners[event].forEach(listener => listener(...args));
        }
    }
}