environment modules macos
(() => { 'use strict'; class EventEmitter { constructor() { this.events = new Map(); } on(event, listener) { if (typeof listener !== 'function') { throw new TypeError('The listener must be a function'); } let listeners = this.events.get(event); if (!listeners) { listeners = new Set(); this.events.set(event, listeners); } listeners.add(listener); return this; } off(event, listener) { if (!arguments.length) { this.events.clear(); } else if (arguments.length === 1) { this.events.delete(event); } else { const listeners = this.events.get(event); if (listeners) { listeners.delete(listener); } } return this; } emit(event, ...args) { const listeners = this.events.get(event); if (listeners) { for (let listener of listeners) { listener.apply(this, args); } } return this; } } this.EventEmitter = EventEmitter; })();
