client middleware export causes vite-plugin-tanstack-start-create-server-fn to throw error

[thephilippbusch]

Which project does this relate to?

Start

Describe the bug

Creating and exporting a client middleware using createMiddleware().client() causes an internal server error with the following message:

Internal server error: createMiddleware must be called with a "use" property!

The bug seems to originate from vite-plugin-tanstack-start-create-server-fn

Full error message:

[vite] Internal server error: createMiddleware must be called with a "use" property!
  Plugin: vite-plugin-tanstack-start-create-server-fn
  File: /.../tanstack-start/app/middleware/logger.ts
      at Object.handleCreateMiddlewareCallExpression [as handleCallExpression] (file:///.../tanstack-start/node_modules/@tanstack/start-vite-plugin/dist/esm/compilers.js:261:11)
      at file:///.../tanstack-start/node_modules/@tanstack/start-vite-plugin/dist/esm/compilers.js:113:40
      at Array.forEach (<anonymous>)
      at file:///.../tanstack-start/node_modules/@tanstack/start-vite-plugin/dist/esm/compilers.js:112:44
      at Array.forEach (<anonymous>)
      at enter (file:///.../tanstack-start/node_modules/@tanstack/start-vite-plugin/dist/esm/compilers.js:111:24)
      at NodePath._call (/.../tanstack-start/node_modules/@babel/traverse/lib/path/context.js:49:20)
      at NodePath.call (/.../tanstack-start/node_modules/@babel/traverse/lib/path/context.js:39:18)
      at NodePath.visit (/.../tanstack-start/node_modules/@babel/traverse/lib/path/context.js:88:31)
      at TraversalContext.visitQueue (/.../tanstack-start/node_modules/@babel/traverse/lib/context.js:90:16)
      at TraversalContext.visitSingle (/.../tanstack-start/node_modules/@babel/traverse/lib/context.js:66:19)
      at TraversalContext.visit (/.../tanstack-start/node_modules/@babel/traverse/lib/context.js:113:19)
      at traverseNode (/.../tanstack-start/node_modules/@babel/traverse/lib/traverse-node.js:22:17)
      at Module.traverse (/.../tanstack-start/node_modules/@babel/traverse/lib/index.js:53:34)
      at compileStartOutput (file:///.../tanstack-start/node_modules/@tanstack/start-vite-plugin/dist/esm/compilers.js:24:9)
      at TransformPluginContext.transform (file:///.../tanstack-start/node_modules/@tanstack/start-vite-plugin/dist/esm/index.js:44:24)
      at EnvironmentPluginContainer.transform (file:///.../tanstack-start/node_modules/vite/dist/node/chunks/dep-BJP6rrE_.js:47224:19)
      at async loadAndTransform (file:///.../tanstack-start/node_modules/vite/dist/node/chunks/dep-BJP6rrE_.js:41034:27)

Your Example Website or App

https://github.com/thephilippbusch/tanstack-start

Steps to Reproduce the Bug or Issue

1. Start the server using bun dev
2. Open the app in a browser on port 3000
3. See the error

Expected behavior

createMiddleware().client() to work properly

Screenshots or Videos

No response

Platform

• OS: macOS
• Browser: Chrome (Arc)
• Runtime: bun

Additional context

I manually setup the project using the Build from Scratch guide from the docs.