noUnusedImports fix: "safe" causes race condition with Claude Code hooks

[gmickel]

Hey! Following up on my tweet you liked 😄

The problem

Ultracite sets noUnusedImports: { fix: "safe" } in the core config. This causes a race condition when using Claude Code with a PostToolUse hook that runs ultracite fix:

1. Claude adds an import via Edit tool
2. PostToolUse hook fires, runs ultracite fix
3. Import gets removed (it's "unused" - the usage hasn't landed yet)
4. Claude's next edit adds the usage... but the import is gone 💀

Workaround

Setting fix: "unsafe" in my local biome.jsonc fixes it:

"noUnusedImports": { "level": "error", "fix": "unsafe" }

The hook then skips the fix (unsafe fixes need --unsafe true), but I can still clean up manually when needed.

Suggestion

Would it make sense to change the default to fix: "unsafe"? I think that's actually Biome's default behavior anyway. Safe fixes are nice in theory but the AI tooling race condition is pretty painful.

Happy to hear if there's a better approach I'm missing!