Grabbed dndbeyond's source code

```
~/go/bin/sourcemapper -output ddb -jsurl https://media.dndbeyond.com/character-app/static/js/main.90aa78c5.js
```

ddb_main/tools/js/CharacterBuilder/containers/pages/ConnectedBuilderPage/ConnectedBuilderPage.tsx

@@ -0,0 +1,55 @@
+import React from "react";
+import { connect } from "react-redux";
+import { Navigate } from "react-router-dom";
+
+import { navigationConfig } from "../../../config";
+import { BuilderAppState } from "../../../typings";
+import { NavigationUtils } from "../../../utils";
+
+interface Props {
+  isPageAccessible: boolean;
+  redirectRoute?: string | null;
+}
+const BuilderPage = (Wrapped) =>
+  class extends React.PureComponent<Props> {
+    render() {
+      const { isPageAccessible, redirectRoute } = this.props;
+
+      if (!isPageAccessible && redirectRoute) {
+        return <Navigate to={redirectRoute} />;
+      }
+
+      return (
+        <div>
+          <Wrapped {...this.props} />
+        </div>
+      );
+    }
+  };
+
+const ConnectedBuilderPage = (
+  Wrapped,
+  routeKey,
+  wrappedMapStateToProps = (state: BuilderAppState): any => ({})
+) => {
+  function mapStateToProps(state: BuilderAppState) {
+    // const isPageAccessible = checkIsRouteAccessible(routeKey, state);
+
+    const isPageAccessible = NavigationUtils.checkStdBuilderPageRequirements(
+      navigationConfig.getRouteDef(routeKey),
+      state
+    );
+
+    return {
+      ...wrappedMapStateToProps(state),
+      isPageAccessible,
+      redirectRoute: isPageAccessible
+        ? null
+        : NavigationUtils.getAvailableRouteRedirect(routeKey, state),
+    };
+  }
+
+  return connect(mapStateToProps)(BuilderPage(Wrapped));
+};
+
+export default ConnectedBuilderPage;

ddb_main/tools/js/CharacterBuilder/containers/pages/ConnectedBuilderPage/index.ts

@@ -0,0 +1,4 @@
+import ConnectedBuilderPage from "./ConnectedBuilderPage";
+
+export default ConnectedBuilderPage;
+export { ConnectedBuilderPage };