Summary

A `ReferenceError: $R is not defined` is occurring in the browser console when using TanStack Start version `v1.136.4` or later. This seems to be related to a missing global variable or a build/bundling issue, possibly introduced in a recent update. The fix likely involves ensuring the `$R` variable is correctly defined or imported in the client-side bundle.

Skills Required

Files Likely Touched

• packages/arktype-adapter/src/index.ts
• packages/start-plugin-core/src/create-server-fn-plugin/plugin.ts
• packages/router/src/file-routes.ts