Changed .gitignore, and started using service-worker again

server/public/service-worker.js

@@ -0,0 +1,65 @@
+var version = 'v3.4';
+var CACHE_FILES = [
+    '/assets/html/offline.html',
+    '/assets/manifest.json',
+    '/assets/images/favicon.png'
+];
+
+self.addEventListener("install", function(event) {
+    event.waitUntil(
+        caches
+        .open(version + '::zoff')
+        .then(function(cache) {
+            return cache.addAll(CACHE_FILES);
+        })
+        .then(function() {
+        })
+    );
+});
+
+self.addEventListener("activate", function(event) {
+
+    var cacheWhitelist = version;
+
+    event.waitUntil(
+        caches.keys().then(function(keyList) {
+            return Promise.all(keyList.map(function(key) {
+                if (!key.startsWith(cacheWhitelist)) {
+                    return caches.delete(key);
+                }
+            }));
+        })
+    );
+});
+
+self.addEventListener('fetch', event => {
+  if (event.request.mode === 'navigate' ||
+    (event.request.method === 'GET' &&
+        (event.request.headers.get('accept').includes('text/html') ||
+         event.request.headers.get('accept').includes('text/css') ||
+            (event.request.headers.get('accept').includes('*/*') &&
+                (event.request.url.includes('localhost') || event.request.url.includes('zoff.me')))))) {
+    event.respondWith(
+      fetch(event.request.url).catch(error => {
+        if(event.request.url.includes('manifest.json')){
+          return caches.open(version + "::zoff").then(function(cache) {
+              return cache.match("/assets/manifest.json");
+          });
+        } else if (event.request.url.includes('favicon')) {
+          return caches.open(version + "::zoff").then(function(cache) {
+              return cache.match("/assets/images/favicon.png");
+          });
+        } else if (event.request.url.includes('service-worker')) {
+          return caches.open(version + "::zoff").then(function(cache) {
+              return cache.match("/service-worker.js");
+          });
+        } else {
+          return caches.open(version + "::zoff").then(function(cache) {
+              return cache.match("/assets/html/offline.html");
+          });
+        }
+      })
+    );
+  }
+
+});