push notifications work now

package.json

@@ -63,6 +63,7 @@
   "author": "Tinode Authors <info@tinode.co>",
   "license": "Apache-2.0",
   "dependencies": {
+    "firebase": "^5.5.0",
     "react": "^16.5.1",
     "react-dom": "^16.4.2",
     "tinode-sdk": "^0.15.6-rc3"

src/webapp.jsx

@@ -11,6 +11,10 @@ if (typeof require == 'function') {
     var Tinode = require('tinode-sdk');
     var Drafty = Tinode.Drafty;
   }
+  if (typeof firebase == 'undefined') {
+    var firebase = require('firebase/app');
+    require('firebase/messaging');
+  }
 }
 
 // Name of this application, used in the User-Agent.