fetch_event

/**
 * Polyfill the `FetchEvent` if it's not available
 */
if (typeof FetchEvent === "undefined") {
  await import("https://deno.land/x/fetch_event_adapter@v1.0.5/listen.ts");
}

/**
 * Add a fetch event handler
 * @param {(req: FetchEvent) => void} handler
 * @returns undefined
 */
export function fetchEventHandler(handler) {
  addEventListener("fetch", (req) => {
    handler(req);
  });
}

/**
 * Respond to a fetch event with a response handler
 * @param {FetchEvent} req
 * @param {() => Response | Promise<Response>} handler
 * @returns undefined
 */
export function respondWith(req, handler) {
  req.respondWith(handler());
}

/**
 * Wait until a promise resolves
 * @param {FetchEvent} req
 * @param {Promise} promise
 * @returns undefined
 */
export function waitUntil(req, promise) {
  req.waitUntil(promise);
}

export function toNativeResponse(response) {
  return new globalThis.Response(response.body, {
    status: response.status,
    headers: response.headers,
  });
}