first commit

build/node_modules/generate-service-worker/templates/main.js

@@ -0,0 +1,41 @@
+if (!$Cache) {
+  self.addEventListener('install', (event) => {
+    event.waitUntil(self.skipWaiting());
+  });
+}
+
+function print(fn) {
+  return function (message, group) {
+    if ($DEBUG) {
+      if (group && logger.groups[group]) {
+        logger.groups[group].push({
+          fn: fn,
+          message: message
+        });
+      } else {
+        console[fn].call(console, message);
+      }
+    }
+  };
+}
+
+const logger = {
+  groups: {},
+  group: group => {
+    logger.groups[group] = [];
+  },
+  groupEnd: group => {
+    const groupLogs = logger.groups[group];
+    if (groupLogs && groupLogs.length > 0) {
+      console.groupCollapsed(group);
+      groupLogs.forEach(log => {
+        console[log.fn].call(console, log.message);
+      });
+      console.groupEnd();
+    }
+    delete logger.groups[group];
+  },
+  log: print('log'),
+  warn: print('warn'),
+  error: print('error')
+};