Redo npm

src/app.js

@@ -1,3 +1,4 @@
+import React from 'react';
 class Verification extends React.Component {
     constructor(props) {
         super(props);

static/header.tpl

@@ -9,7 +9,7 @@
   <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
   <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script>
   <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js"></script>
-  <script src="/static/app.js"></script>
+  <script type="module" src="/static/app.js"></script>
 
 <!-- Navigation -->
 <nav class="navbar navbar-expand-lg navbar-dark bg-dark static-top">