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| class EventEmitter { |
| constructor() { |
| this._listeners = new Map(); |
| } |
|
|
| on(event, fn) { |
| if (typeof fn !== 'function') throw new TypeError('listener bir fonksiyon olmalı'); |
| if (!this._listeners.has(event)) this._listeners.set(event, []); |
| this._listeners.get(event).push({ fn, once: false }); |
| return () => this.off(event, fn); |
| } |
|
|
| once(event, fn) { |
| if (typeof fn !== 'function') throw new TypeError('listener bir fonksiyon olmalı'); |
| if (!this._listeners.has(event)) this._listeners.set(event, []); |
| this._listeners.get(event).push({ fn, once: true }); |
| return () => this.off(event, fn); |
| } |
|
|
| off(event, fn) { |
| const list = this._listeners.get(event); |
| if (!list) return false; |
| const idx = list.findIndex((l) => l.fn === fn); |
| if (idx === -1) return false; |
| list.splice(idx, 1); |
| if (list.length === 0) this._listeners.delete(event); |
| return true; |
| } |
|
|
| emit(event, ...args) { |
| const list = this._listeners.get(event); |
| if (!list) return 0; |
| const snapshot = list.slice(); |
| for (const l of snapshot) { |
| if (l.once) this.off(event, l.fn); |
| l.fn(...args); |
| } |
| return snapshot.length; |
| } |
|
|
| listenerCount(event) { |
| return (this._listeners.get(event) || []).length; |
| } |
| } |
|
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| module.exports = { EventEmitter }; |
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|
