export interface TransportEmitter<TListener extends (...args: never[]) => void> {
	on(listener: TListener): () => void;
	emit(...args: Parameters<TListener>): void;
	clear(): void;
}

export function createTransportEmitter<
	TListener extends (...args: never[]) => void
>(): TransportEmitter<TListener> {
	const listeners = new Set<TListener>();
	return {
		on(listener) {
			listeners.add(listener);
			return () => {
				listeners.delete(listener);
			};
		},
		emit(...args) {
			for (const listener of [...listeners]) listener(...args);
		},
		clear() {
			listeners.clear();
		}
	};
}