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robobun bcbb4fc35d fix(cli): show helpful error for unsupported file types instead of "File not found" (#26126)
## Summary

- When running `bun <file>` on a file with an unsupported type (e.g.,
`.css`, `.yaml`, `.toml`), Bun now shows a helpful error message instead
of the misleading "File not found"
- Tracks when a file is resolved but has a loader that can't be run
directly
- Shows the actual file path and file type in the error message

**Before:**
```
error: File not found "test.css"
```

**After:**
```
error: Cannot run "/path/to/test.css"
note: Bun cannot run css files directly
```

## Test plan

- [x] Added regression test in `test/regression/issue/1365.test.ts`
- [x] Test verifies unsupported files show "Cannot run" error
- [x] Test verifies nonexistent files still show "File not found"
- [x] Test fails with `USE_SYSTEM_BUN=1` and passes with debug build

Fixes #1365

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Claude Bot <claude-bot@bun.sh>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Co-authored-by: Jarred Sumner <jarred@jarredsumner.com>
2026-01-15 23:40:45 -08:00
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