Created
May 2, 2024 08:53
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EventEmitter - Super light weight, Simple and Powerful
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| type EventEmitterListener = (...args: never[]) => void | |
| class EventEmitter<Events extends Record<EventName, EventEmitterListener>, EventName extends keyof Events = keyof Events> { | |
| private callbacks: Partial<Record<keyof never, Set<EventEmitterListener>>> = {} | |
| public on<Event extends keyof Events>(event: Event, callback: Events[Event]) { | |
| this.callbacks[event] ??= new Set | |
| this.callbacks[event]?.add(callback as EventEmitterListener) | |
| } | |
| public off<Event extends keyof Events>(event: Event, callback: Events[Event]) { | |
| this.callbacks[event]?.delete(callback as EventEmitterListener) | |
| } | |
| public emit<Event extends keyof Events>(event: Event, ...args: Parameters<Events[Event]>) { | |
| const callbacks = this.callbacks[event] | |
| if (callbacks == null) return | |
| for (const callback of callbacks) callback(...args) | |
| } | |
| } |
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