TanStack Start development server fails when embedding a Sanity studio

[alexanbj]

Which project does this relate to?

Start

Describe the bug

Hello,

I'm attempting to embed a Sanity studio in a newly setup TanStack Start app.

I'm followed the TanStack Start getting started guide and Sanity's embedding studio guide. However, an exception is thrown if I navigate to that route when using the development server. I've created a reproduction repo.

The error seems to occur in vite-plugin-tanstack-start-dead-code-elimination. See the full error in the reproduction steps or the reproduction repo.

No error is thrown when building the app for production.

Your Example Website or App

https://github.com/alexanbj/tanstackstart-embedded-sanity-reproduction/tree/main

Steps to Reproduce the Bug or Issue

1. Create a new TanStack Start app following these instructions https://tanstack.com/router/latest/docs/framework/react/start/getting-started
2. Create a new route where a Sanity studio is embedded https://www.sanity.io/docs/embedding-sanity-studio
3. Run the dev server and navigate to that route
4. It fails with an exception along the lines of

   [vite] Internal server error: Property left of ForOfStatement expected node to be of a type ["VariableDeclaration","LVal"] but instead got undefined
   Plugin: vite-plugin-tanstack-start-dead-code-elimination
   File: /Users/alexanbj/Code/Hacking/tanstackstart-sanity-reproduction/node_modules/.vinxi/cache/client/deps/chunk-XONAPM26.js?v=ffa86631

Expected behavior

Able to embed the Sanity studio in development.

Screenshots or Videos

No response

Platform

• OS: macOS
• Browser: Firefox
• TanstackStart and Router versions: 1.85.0

Additional context

No response

[schiller-manuel]

can you please run TSR_VITE_DEBUG=true npm run build and provide the output as a gist?