chore(build): try to build demo and docs (#3434)

platform/app/src/routes/CallbackPage.tsx

@@ -0,0 +1,21 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+
+function CallbackPage({ userManager, onRedirectSuccess }) {
+  const onRedirectError = error => {
+    throw new Error(error);
+  };
+
+  userManager
+    .signinRedirectCallback()
+    .then(user => onRedirectSuccess(user))
+    .catch(error => onRedirectError(error));
+
+  return null;
+}
+
+CallbackPage.propTypes = {
+  userManager: PropTypes.object.isRequired,
+};
+
+export default CallbackPage;