Further attempts to integrate

web/src/js/app.mjs

@@ -0,0 +1,17 @@
+// jQuery 3.x
+import {$, jQuery} from 'jquery/src/jquery';
+
+// jQuery Migrate 3.x
+import 'jquery-migrate/src/migrate';
+
+// Popper 1.x
+import 'popper.js';
+
+// Boostrap 4.x
+import 'bootstrap/js/src/index';
+
+// Old application code
+import './main';
+
+// New application code
+import './index';