From Discord: Unhandled error with `vitest` and `Effect.withSpan`

[effect-bot]

Summary

Summary

Several users are experiencing an issue with vitest and Effect.withSpan from the effect library. Specifically, when running a test that involves Effect.withSpan and an Error object, an unhandled error occurs. This issue does not appear when the error is a string or when Effect.withSpan is not used.

Key Takeaways

1. Issue Description:

   • When running a test with Effect.withSpan and an Error object, an unhandled error occurs.
   • The issue does not occur when the error is a string or when Effect.withSpan is not used.

2. Workaround:

   • Catching the error using .catch(e => { console.log(e) }) prevents the unhandled error.

3. Version Specific:

   • The issue does not occur in vitest version 1.5.3 but is present in version 1.6.0.

4. Potential Cause:

   • The problem seems to be related to the handling of file:// URLs in stack traces. Specifically, the absence of file:// in certain parts of the stack trace causes the issue.

5. Code Insight:

   • The line this[FiberFailureCauseId] = cause in FiberFailureImpl might be causing the issue.
   • Removing this line or modifying it to include cause: this[FiberFailureCauseId].toJSON() can serve as a temporary fix.

Conclusion

The issue appears to be related to how vitest handles stack traces and file:// URLs in its newer version (1.6.0). Users experiencing this issue can either downgrade to version 1.5.3 or apply the suggested code modifications as a temporary workaround.

Discord thread

https://discord.com/channels/795981131316985866/1242486270547067012