Constants

Exported values

serwist exports a few constants that you can make use of for more convenience. This includes:

BROADCAST_UPDATE_DEFAULT_HEADERS

The default list of headers to check.

import { responsesAreSame, BROADCAST_UPDATE_DEFAULT_HEADERS } from "serwist";

declare const self: ServiceWorkerGlobalScope;

const cacheName = "api-cache";
const request = new Request("https://example.com/api");

const cache = await caches.open(cacheName);
const oldResponse = await cache.match(request);
const newResponse = await fetch(request);

if (oldResponse && !responsesAreSame(oldResponse, newResponse, BROADCAST_UPDATE_DEFAULT_HEADERS)) {
  const windows = await self.clients.matchAll({ type: "window" });
  for (const win of windows) {
    win.postMessage({ type: "CACHE_UPDATED", message: "Update now!" });
  }
}