feat: public/sw.js (#16)

Author: tapiwamakandigona

public/sw.js

@@ -0,0 +1,19 @@
+const CACHE_NAME = "todo-app-v2";
+const ASSETS = ["/", "/index.html"];
+
+self.addEventListener("install", (e) => {
+  e.waitUntil(caches.open(CACHE_NAME).then(c => c.addAll(ASSETS)));
+  self.skipWaiting();
+});
+
+self.addEventListener("activate", (e) => {
+  e.waitUntil(caches.keys().then(keys =>
+    Promise.all(keys.filter(k => k !== CACHE_NAME).map(k => caches.delete(k)))
+  ));
+});
+
+self.addEventListener("fetch", (e) => {
+  e.respondWith(
+    caches.match(e.request).then(cached => cached || fetch(e.request))
+  );
+});