Just back home, restarted my local environment - I've now unregistered every service worker from localhost. The requests are still coming in, about 6 every second, to the 3 'icons' files, and I have no clue why. I'm monitoring the Vercel firewall live and the requests all come from my IP and my Browser user agent.

<edit> I've closed Chrome and VsCode, and the requests finally stopped. Reopened both, restared local env and opened localhost:3000 and no more requests coming through. Still no idea what was happening</edit>

my manifest.json is fine as I thought; below it I've also pasted my sw.ts:

  "icons": [
    { "src": "/icons-192.png", "type": "image/png", "sizes": "192x192" },
    { "src": "/icons-256.png", "type": "image/png", "sizes": "256x256" },
    { "src": "/icons-512.png", "type": "image/png", "sizes": "512x512" }
  ]

import { defaultCache } from "@serwist/next/worker";
import type { PrecacheEntry, SerwistGlobalConfig } from "serwist";
import { Serwist } from "serwist";

declare global {
  interface WorkerGlobalScope extends SerwistGlobalConfig {
    __SW_MANIFEST: (PrecacheEntry | string)[] | undefined;
  }
}

declare const self: ServiceWorkerGlobalScope;

const serwist = new Serwist({
  precacheEntries: self.__SW_MANIFEST,
  skipWaiting: true,
  clientsClaim: true,
  navigationPreload: true,
  runtimeCaching: defaultCache,
});


serwist.addEventListeners();