@alegendstale/holly-components/dist/utils/EventEmitter.js

Reusable UI components created using lit

export class EventEmitter {
    constructor() {
        this.eventListeners = {};
    }
    on(eventName, listener) {
        const listeners = this.eventListeners[eventName] ?? new Set();
        listeners.add(listener);
        this.eventListeners[eventName] = listeners;
    }
    off(eventName, listener) {
        const listeners = this.eventListeners[eventName] ?? new Set();
        listeners.delete(listener);
        this.eventListeners[eventName] = listeners;
    }
    emit(eventName, ...args) {
        const listeners = this.eventListeners[eventName] ?? new Set();
        for (const listener of listeners) {
            listener(...args);
        }
    }
    clear() {
        this.eventListeners = {};
    }
}