easy-going-rails/app/views/layouts/_notification.html.erb

<h2>NOTIFICATION BAR</h2>

<% if flash %>
  <script type="module">
    import { Notyf } from 'notyf';
    const notyf=new Notyf
    notyf.success('<%=notice%>')
    notyf.error('<%=alert%>')
  </script>
<%end%>