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[WIP] Fix ReferenceError during tanstack start application startup #6165

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[WIP] Fix ReferenceError during tanstack start application startup #6165

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Copilot AI commented Dec 20, 2025

Thanks for assigning this issue to me. I'm starting to work on it and will keep this PR's description up to date as I form a plan and make progress.

Original prompt

This section details on the original issue you should resolve

<issue_title>ReferenceError: Cannot access 'vite_ssr_import_2' before initialization</issue_title>
<issue_description>### Which project does this relate to?

Start

Describe the bug

When starting our tanstack start application in development environment, we sometimes get the following error in the terminal:

ReferenceError: Cannot access '__vite_ssr_import_2__' before initialization
    at Module.getRouter (/Users/ulrichstark/Desktop/tanstack-vite-cannot-access-vite-ssr-import-before-initalization/src/router.tsx:7:9)
    ... 2 lines matching cause stack trace ...
    at async eval (/Users/ulrichstark/Desktop/tanstack-vite-cannot-access-vite-ssr-import-before-initalization/node_modules/@tanstack/start-server-core/src/createStartHandler.ts:243:32) {
  cause: ReferenceError: Cannot access '__vite_ssr_import_2__' before initialization
      at Module.getRouter (/Users/ulrichstark/Desktop/tanstack-vite-cannot-access-vite-ssr-import-before-initalization/src/router.tsx:7:9)
      at getRouter (/Users/ulrichstark/Desktop/tanstack-vite-cannot-access-vite-ssr-import-before-initalization/node_modules/@tanstack/start-server-core/src/createStartHandler.ts:123:55)
      at async handleServerRoutes (/Users/ulrichstark/Desktop/tanstack-vite-cannot-access-vite-ssr-import-before-initalization/node_modules/@tanstack/start-server-core/src/createStartHandler.ts:358:18)
      at async eval (/Users/ulrichstark/Desktop/tanstack-vite-cannot-access-vite-ssr-import-before-initalization/node_modules/@tanstack/start-server-core/src/createStartHandler.ts:243:32),
  status: 500,
  statusText: undefined,
  headers: undefined,
  data: undefined,
  body: undefined,
  unhandled: true
}

And the opened application in the browser only shows:

{"status":500,"unhandled":true,"message":"HTTPError"}

When reloading the page, the error goes away and our application is shown.

Your Example Website or App

https://github.com/ulrichstark/tanstack-vite-cannot-access-vite-ssr-import-before-initalization

Steps to Reproduce the Bug or Issue

  1. Clone https://github.com/ulrichstark/tanstack-vite-cannot-access-vite-ssr-import-before-initalization
  2. Go into folder
  3. npm install
  4. Run npx vite --force
  5. Wait a few seconds
  6. If error isn't visible, stop vite and try again starting from step 4

Expected behavior

No error

Screenshots or Videos

No response

Platform

  • Router / Start Version: 1.133.34
  • OS: macOS
  • Browser: Chrome
  • Browser Version: 141.0.7390.123
  • Bundler: Vite
  • Bundler Version: 7.1.12

Additional context

Don't mind the funky reproduction project. It's a product of hours deleting stuff in our project to condense it down to the minimal amount of code that triggers this issue. I hope you can reproduce it on your side. I'm not sure what is causing the issue because it seems to be gone when I delete more relevant code from the project. It's most probably something with my ErrorComponent and its server function which is used as defaultErrorComponent:

import { createServerFn } from "@tanstack/react-start";
import { useEffect } from "react";
import { getCookies } from "@tanstack/react-start/server";
import { House } from "lucide-react";

const reportErrorToServer = createServerFn().handler(() => {
    getCookies();
});

export function ErrorComponent() {
    useEffect(() => {
        reportErrorToServer();
    }, []);

    return <House />;
}
```</issue_description>

## Comments on the Issue (you are @copilot in this section)

<comments>
<comment_new><author>@schiller-manuel</author><body>
@flodaniel  @kopdigitaal  do you only have this issue once or does it persist?</body></comment_new>
<comment_new><author>@schiller-manuel</author><body>
> whenever we start the project initially

what does this mean? only the first time you run the vite dev server after cloning the repo?</body></comment_new>
<comment_new><author>@schiller-manuel</author><body>
@flodaniel would you be able to provide a reproducer for this? the above reproducer only shows this once </body></comment_new>
<comment_new><author>@schiller-manuel</author><body>
@mackattack3k can you show this in a reproducer project? </body></comment_new>
<comment_new><author>@schiller-manuel</author><body>
@moncapitaine  can you share a complete project that reproduces this?</body></comment_new>
<comment_new><author>@schiller-manuel</author><body>
@amserra can you share a complete project that reproduces this?</body></comment_new>
</comments>

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@schiller-manuel
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schiller-manuel commented Dec 20, 2025

@copilot retry

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ReferenceError: Cannot access '__vite_ssr_import_2__' before initialization

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