@dark-engine/core/dist/cjs/emitter/emitter.js

The lightweight and powerful UI rendering engine without dependencies and written in TypeScript (Browser, Node.js, Android, iOS, Windows, Linux, macOS)

'use strict';
Object.defineProperty(exports, '__esModule', { value: true });
exports.EventEmitter = void 0;
class EventEmitter {
  subscribers = new Map();
  on(e, fn) {
    !this.subscribers.has(e) && this.subscribers.set(e, new Set());
    this.subscribers.get(e).add(fn);
    return () => this.subscribers.has(e) && this.subscribers.get(e).delete(fn);
  }
  emit(e, data) {
    if (!this.subscribers.has(e)) return;
    const subs = Array.from(this.subscribers.get(e));
    for (const sub of subs) sub(data);
  }
  kill() {
    this.subscribers = new Map();
  }
  __getSize(e) {
    return e ? this.subscribers.get(e)?.size ?? 0 : this.subscribers.size;
  }
}
exports.EventEmitter = EventEmitter;
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