Summary

Fixes the intermittent pnpm test failure on the Test with TypeScript 6 and Test with TypeScript latest CI jobs, caused by a baseUrl deprecation in packages/docs/tsconfig.json that vitest 4.x surfaces as an unhandled source error.

Problem

Under TypeScript 6, "baseUrl": "." emits a deprecation:

TypeCheckError: Option 'baseUrl' is deprecated and will stop functioning in TypeScript 7.0.
Specify compilerOption '"ignoreDeprecations" "6.0"' to silence this error.
 ❯ packages/docs/tsconfig.test.json:3:3

Vitest 4.x's typecheck integration catches the warning and re-emits it as an "Unhandled Source Error", which fails the test runner with exit 1 even when every test passes (Tests 3791 passed (3791), Type Errors no errors, Errors 1 error). Whether the error is caught vs. dropped depends on worker timing, so different PRs see different outcomes for the same underlying state — same TypeScript version (6.0.3), same vitest (4.1.5):

Why the existing CI patch doesn't cover this

Commit 4e29983 (fix ci with "ignoreDeprecations": "6.0" in TypeScript 7) already adds a jq step to the workflow that injects ignoreDeprecations: "6.0" into .configs/tsconfig.base.json for the TS 6 / latest matrix entries. That patch handles packages/zod's typechecks fine.

But packages/docs/tsconfig.json is standalone — it doesn't extends .configs/tsconfig.base.json — so the workflow's jq patch never reaches it, and packages/docs/tsconfig.test.json (which extends the docs tsconfig) keeps surfacing the deprecation under TS 6+.

Fix

One line: add "ignoreDeprecations": "6.0" to packages/docs/tsconfig.json. This is the documented mitigation in the deprecation message itself, and is the same value the workflow's jq step injects elsewhere.

 {
   "compilerOptions": {
+    "ignoreDeprecations": "6.0",
     "baseUrl": ".",

Verification

Reproduced locally with TS 6.0.3 + vitest 4.1.5. Before the fix, the unhandled error appears on most runs but not all (consistent with the cross-PR pattern above). After the fix, three consecutive pnpm test runs all complete without the error:

=== run 1 ===
 Test Files  336 passed (337) [redos test from #5919 unrelated]
      Tests  3788 passed (3789)
Type Errors  no errors
=== run 2 === (same)
=== run 3 === (same)

No Errors 1 error line in any run. The 1 failed is the unrelated Windows-only redos checker flake that PR #5919 fixes; it is not caused by this PR.

Scope

• 1 file touched: packages/docs/tsconfig.json (+1 line).
• Zero runtime / library code changes.
• No new dependencies, no workflow changes.
• Strictly more permissive on TS 6+: silences a future-removal warning that has no behavioural effect today. On TS 5.5 the option is a no-op.

Alternative considered

Extending the workflow's jq step to also patch packages/docs/tsconfig.json would work but spreads the same workaround across two places and ties unrelated jobs together. Setting it in the source file is one line and self-documenting. Happy to switch to the workflow approach if preferred.