discourse/app/views/common/_discourse_javascript.html.erb

<script>
  Ember.RSVP.configure('onerror', function(e) {
    // Ignore TransitionAborted exceptions that bubble up
    if (e && e.message === "TransitionAborted") { return; }

    <% if Rails.env.development? %>
      if (e) {
        if (e.message || e.stack) {
          console.log(e.message);
          console.log(e.stack);
        } else {
          console.log("Uncaught promise: ", e);
        }
      } else {
        console.log("A promise failed but was not caught.");
      }
    <% end %>
    window.onerror(e && e.message, null,null,null,e);
  });
</script>

<script>
  <%- if !current_user && flash[:authentication_data] %>
    Discourse.showingSignup = true
    require('discourse/routes/application').default.reopen({
      actions: {
        didTransition: function() {
          Em.run.next(function(){
            Discourse.authenticationComplete(<%=flash[:authentication_data].html_safe%>);
          });
          return this._super();
        }
      }
    });
  <%- end %>
</script>

<%= preload_script 'browser-update' %>