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bug: createIsomorphicFn doesn't resolve callbacks when used in different vars #6206
Description
Which project does this relate to?
Start
Describe the bug
When using isomorphic functions, the new compiler ignores the server() and client() when split across 2 different variables. I believe this happens because its looking at a specific ast node, and when used cant trace back to the original ref
Your Example Website or App
https://gist.github.com/nikuscs/f407a4561cf7f71fc25fe4703709c4cb
Steps to Reproduce the Bug or Issue
Check the gist, define a isomorphicfn in a variable and use it in another one. It will throw a no-op warning, because both server and client fns are stripped.
Expected behavior
To be able to resolve back the original variable so we can compose iso functions
Screenshots or Videos
No response
Platform
- Router / Start Version: [e.g. 1.121.0]
- OS: [e.g. macOS, Windows, Linux]
- Browser: [e.g. Chrome, Safari, Firefox]
- Browser Version: [e.g. 91.1]
- Bundler: [e.g. vite]
- Bundler Version: [e.g. 7.0.0]
Additional context
Relevant discussion : https://discord.com/channels/719702312431386674/1453166955988123829
Reacted by coderabbitai
Activity
coderabbitai commentedon Dec 24, 2025
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🔗 Related PRs
#4806 - docs(start): createIsomorphicFn and envOnly [merged]
#5450 - fix: compile directive replacements [merged]
#5650 - fix: fix static server functions [merged]
#5702 - fix: run start compiler on imports from
@tanstack/start-client-core[merged]#6166 - fix: trace nested server function factory re-export chain [merged]
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FerasAloudah commentedon Dec 24, 2025
I'm getting a no-op warning as well. I've tried both approaches, but neither worked on my side.
schiller-manuel commentedon Dec 25, 2025
i cannot reproduce this on https://github.com/TanStack/router/releases/tag/v1.143.6
if this is still reproducable for you, please create a complete minimal reproducer project.
fix: createIsomorphicFn compilation