first commit

apps/frontend/public/sw.js

@@ -0,0 +1,37 @@
+const CACHE_NAME = "productier-v1";
+const PRECACHE = ["/", "/manifest.json", "/favicon.ico"];
+
+self.addEventListener("install", event => {
+  event.waitUntil(caches.open(CACHE_NAME).then(cache => cache.addAll(PRECACHE)));
+});
+
+self.addEventListener("activate", event => {
+  event.waitUntil(
+    caches.keys().then(keys =>
+      Promise.all(keys.filter(key => key !== CACHE_NAME).map(key => caches.delete(key))),
+    ),
+  );
+});
+
+self.addEventListener("fetch", event => {
+  if (event.request.method !== "GET") {
+    return;
+  }
+
+  event.respondWith(
+    caches.match(event.request).then(cached => {
+      if (cached) {
+        return cached;
+      }
+
+      return fetch(event.request)
+        .then(response => {
+          const copy = response.clone();
+          caches.open(CACHE_NAME).then(cache => cache.put(event.request, copy));
+          return response;
+        })
+        .catch(() => caches.match("/"));
+    }),
+  );
+});
+