Code comments in __root.tsx can cause vite plugin issue

[NickR49]

Which project does this relate to?

Start

Describe the bug

Having code comments in __root.tsx as per the below StackBlitz reproduction can cause this error -

503 Server Unavailable

Error: We detected that the '@vitejs/plugin-react' was passed before '@tanstack/start-vite-plugin'. Please make sure that '@tanstack/router-vite-plugin' is passed before '@vitejs/plugin-react' and try again: 
e.g.

plugins: [
  TanStackStartVite(), // Place this before viteReact()
  viteReact(),
]

    at TransformPluginContext.transform (file:///home/projects/tanstack-router-muerds5c/node_modules/@tanstack/start-vite-plugin/dist/esm/index.js:49:15)
    at EnvironmentPluginContainer.transform (file:///home/projects/tanstack-router-muerds5c/node_modules/vinxi/node_modules/vite/dist/node/chunks/dep-BJP6rrE_.js:47285:19)
    at async loadAndTransform (file:///home/projects/tanstack-router-muerds5c/node_modules/vinxi/node_modules/vite/dist/node/chunks/dep-BJP6rrE_.js:41095:27)
    at async fetchModule (file:///home/projects/tanstack-router-muerds5c/node_modules/vinxi/node_modules/vite/dist/node/chunks/dep-BJP6rrE_.js:51548:16)
    at async handleInvoke (file:///home/projects/tanstack-router-muerds5c/node_modules/vinxi/node_modules/vite/dist/node/chunks/dep-BJP6rrE_.js:44227:22)
    at async EventEmitter.listenerForInvokeHandler (file:///home/projects/tanstack-router-muerds5c/node_modules/vinxi/node_modules/vite/dist/node/chunks/dep-BJP6rrE_.js:44300:19)

Your Example Website or App

https://stackblitz.com/edit/tanstack-router-xi2evreq?file=app%2Froutes%2F__root.tsx&preset=node

Steps to Reproduce the Bug or Issue

1. Go to the above StackBlitz
2. In __root.tsx remove the space in // createServer Fn to recreate the error
3. Alternatively, removing Temporary hack to fix HMR comment further below also makes the error go away

Expected behavior

As a user I was expecting not to have errors caused by comments in __root.tsx

Screenshots or Videos

No response

Platform

• MacOS 15.2
• Chrome 131, Opera 114
• TanStack Router/Start 1.94.1

Additional context

No response