Interface Emitter

src/index.ts:23–39

>;

export interface Emitter<Events extends Record<EventType, unknown>> {
	all: EventHandlerMap<Events>;

	on<Key extends keyof Events>(type: Key, handler: Handler<Events[Key]>): void;
	on(type: '*', handler: WildcardHandler<Events>): void;

	off<Key extends keyof Events>(
		type: Key,
		handler?: Handler<Events[Key]>
	): void;
	off(type: '*', handler: WildcardHandler<Events>): void;

	emit<Key extends keyof Events>(type: Key, event: Events[Key]): void;
	emit<Key extends keyof Events>(
		type: undefined extends Events[Key] ? Key : never
	): void;
}

/**
 * Mitt: Tiny (~200b) functional event emitter / pubsub.