[sapphi-red]

Same with #916 but for tsconfig option.

The alternative is to extract the tsconfig related cache to a separate struct. I didn't use that approach because I thought that is rare and isn't worth the additional complexity.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.80%. Comparing base (bf29bf0) to head (b4fb973).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1402      +/-   ##
==========================================
+ Coverage   94.78%   94.80%   +0.02%     
==========================================
  Files          26       26              
  Lines        4828     4831       +3     
==========================================
+ Hits         4576     4580       +4     
+ Misses        252      251       -1     

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[codspeed]

Merging this PR will degrade performance by 5.28%

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

❌ 2 regressed benchmarks
✅ 19 untouched benchmarks
⏩ 5 skipped benchmarks¹

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
❌	pm/bun-flat	1.9 ms	2 ms	-7.36%
❌	pm/npm-flat	1.9 ms	1.9 ms	-3.15%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.

---

_{Comparing fix/isolate-tsconfig-caches (b4fb973) with main (bf29bf0)}

Footnotes

1. 5 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩