export async function getRequestBody<T = unknown>(
	req: Request,
	validation?: (target: unknown) => target is T,
): Promise<T> {
	if (req.body === null) {
		throw new Error("no body is present on the request");
	}

	const body = await req.json();

	if (validation && !validation(body)) {
		throw new Error("body validation failed");
	}

	return body;
}