Service worker

composer.json

@@ -27,7 +27,10 @@
         "installer-name": "silverstripe-progressivewebapp",
         "branch-alias": {
             "dev-master": "2.x-dev"
-        }
+        },
+        "expose": [
+            "resources"
+        ]
     },
     "autoload": {
         "psr-4": {

resources/js/progressivewebapp.js

@@ -0,0 +1,3 @@
+if ('serviceWorker' in navigator) {
+  navigator.serviceWorker.register('resources/pixelspin/silverstripe-progressivewebapp/resources/js/service-worker.js');
+}