This repository is a monorepo for `react-router-devtools`, a Vite plugin that provides a comprehensive debugging and inspection UI for React Router v7+ applications. It integrates with TanStack DevTools to offer tabs for active page, routes, network waterfall, timeline, settings, errors, and custom plugins. The core mechanism uses Babel-based AST transformations to instrument server and client data functions (loaders, actions) with timing, tracing, and context wrappers without requiring user code changes. The package exports multiple entry points for client, server, and context integration, and supports both framework mode (Vite plugin) and declarative mode (EmbeddedDevTools component). The repository also includes a full documentation site built with React Router, example plugins (icon-library, tailwind-palette), and several test applications. It is a well-crafted developer tool with a modular architecture, but has some technical drift due to tight coupling to React Router internals and reliance on Babel AST transforms that may break with ecosystem changes.