Develop a TypeScript language service plugin: Make RTK Query's "Go to Definition" smarter

Introduction Have you ever encountered this frustration when developing with Redux Toolkit Query (RTK Query)? When you want to check the implementation of an API endpoint, pressing F12 (Go to Definition) takes you to the type definition file instead of the actual business logic. You have to manually search for the endpoint name to find its definition in createApi . This is a common problem because RTK Query hook names (like useGetUserQuery ) are dynamically generated , and TypeScript cannot establish a static mapping from hook calls to endpoint definitions. Today, I'll show you how to develop a TypeScript Language Service Plugin to solve this problem, allowing developers to jump directly to RTK Query endpoint definitions with a single click. Problem Background How RTK Query Works RTK Query creates API slices through createApi : export const userApi = createApi ({ reducerPath : ' userApi ' , baseQuery : fetchBaseQuery ({ baseUrl : ' /api ' }), endpoints : ( builder ) => ({ getUser : bui