Constants

Exported values

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

• BROADCAST_UPDATE_DEFAULT_HEADERS

  What: the default list of headers to check.

  How to use:

  sw.ts

  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!" });
    }
  }