feat: add tsconfig discovery

[Boshen]

Summary

Add automatic tsconfig.json discovery that traverses up parent directories, similar to how package.json is discovered.

closes #626

🤖 Generated with Claude Code

Co-Authored-By: Claude noreply@anthropic.com

Rolldown PR: rolldown/rolldown#6602
Oxlint PR: oxc-project/oxc#14721

[graphite-app]

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[codecov]

Codecov Report

❌ Patch coverage is 88.23529% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.03%. Comparing base (6b9a7cf) to head (0e1674a).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/lib.rs	87.23%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #758      +/-   ##
==========================================
- Coverage   94.19%   94.03%   -0.16%     
==========================================
  Files          16       16              
  Lines        3031     3069      +38     
==========================================
+ Hits         2855     2886      +31     
- Misses        176      183       +7     

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[codspeed-hq]

CodSpeed Performance Report

Merging #758 will degrade performances by 5.16%

_{Comparing feat/tsconfig-discovery (0e1674a) with main (6b9a7cf)}

Summary

❌ 1 regression
✅ 6 untouched
⏩ 2 skipped¹

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
❌	large	26.5 µs	27.9 µs	-5.16%

Footnotes

1. 2 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. ↩

dismiss

[Boshen]

@sapphi-red the code is a bit convoluted right but I plan to clean things up after this is merged and shipped, getting burned out from all the relevant changes already.

Please let me know if I missed anything obvious.

[sapphi-red]

The change looks good to me.

The remaining feature needed for Vite is respecting include & exclude & references (rolldown/rolldown#5867).

[Boshen]

Merge activity

• Oct 17, 10:40 AM UTC: The merge label 'merge' was detected. This PR will be added to the Graphite merge queue once it meets the requirements.
• Oct 17, 10:40 AM UTC: Boshen added this pull request to the Graphite merge queue.
• Oct 17, 10:44 AM UTC: Merged by the Graphite merge queue.

[bluwy]

FWIW this broke the Rust options shape a bit and I had to update it on my end:

-           tsconfig: resolved_tsconfig.map(|config_file| TsconfigOptions {
+           tsconfig: resolved_tsconfig.map(|config_file| {
+               TsconfigDiscovery::Manual(TsconfigOptions {
                    config_file,
                    references: TsconfigReferences::Auto,
+               })
            }),

[Boshen]

FWIW this broke the Rust options shape a bit and I had to update it on my end:

-           tsconfig: resolved_tsconfig.map(|config_file| TsconfigOptions {
+           tsconfig: resolved_tsconfig.map(|config_file| {
+               TsconfigDiscovery::Manual(TsconfigOptions {
                    config_file,
                    references: TsconfigReferences::Auto,
+               })
            }),

Sorry for the inconvenience, I stopped bumping majors for breaking Rust APIs because people complained that I change major versions too much - the reason we are at v11.