pyscript/pyscript.core/tests/service-worker/mini-coi.js

/*! coi-serviceworker v0.1.7 - Guido Zuidhof and contributors, licensed under MIT */
/*! mini-coi - Andrea Giammarchi and contributors, licensed under MIT */
(({ document: d, navigator: { serviceWorker: s } }) => {
  if (d) {
    const { currentScript: c } = d;
    s.register(c.src, { scope: c.getAttribute('scope') || '.' }).then(r => {
      r.addEventListener('updatefound', () => location.reload());
      if (r.active && !s.controller) location.reload();
    });
  }
  else {
    addEventListener('install', () => skipWaiting());
    addEventListener('activate', e => e.waitUntil(clients.claim()));
    addEventListener('fetch', e => {
      const { request: r } = e;
      if (r.cache === 'only-if-cached' && r.mode !== 'same-origin') return;
      e.respondWith(fetch(r).then(r => {
        const { body, status, statusText } = r;
        if (!status || status > 399) return r;
        const h = new Headers(r.headers);
        h.set('Cross-Origin-Opener-Policy', 'same-origin');
        h.set('Cross-Origin-Embedder-Policy', 'require-corp');
        h.set('Cross-Origin-Resource-Policy', 'cross-origin');
        return new Response(body, { status, statusText, headers: h });
      }));
    });
  }
})(self);