/** Create an abort signal that fires after a timeout and preserves caller cancellation. */
export function withTimeoutSignal(timeoutMs: number, signal?: AbortSignal): AbortSignal {
	const timeoutSignal = AbortSignal.timeout(timeoutMs);
	return signal ? AbortSignal.any([signal, timeoutSignal]) : timeoutSignal;
}

/** Detect a timeout raised by an abortable fetch. */
export function isTimeoutError(error: unknown): boolean {
	return error instanceof Error && error.name === "TimeoutError";
}