build(deps): upgrade TypeScript to 6.0.3 - #55
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Bump typescript from 5.9.3 to 6.0.3 (latest stable), pinned exact. This became possible after migrating off typescript-eslint, whose peer range capped TypeScript at <6.1.0. TS6 compiles the codebase with zero type errors. It only flags two tsconfig options as deprecated ahead of TS7 (baseUrl and moduleResolution node10), silenced with `ignoreDeprecations: "6.0"` — the official TS6 transition switch. Migrating those options (e.g. to bundler resolution) is a separate modernization, not this upgrade. Verified: tsc exits 0, 246 tests pass, biome check exits 0.
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Summary
ignoreDeprecations: "6.0"totsconfig.jsonfor the two optionsTS6 deprecates ahead of TS7.
Why now
The previous cap was
typescript-eslint's peer range (<6.1.0). Aftermigrating to Biome (PR #53), that constraint is gone, so TS6 is now
reachable.
What TS6 reported
TS6 compiles the codebase with zero type errors. The only issues
were two deprecation warnings about
tsconfigoptions being removed inTS7:
baseUrl(TS5101)moduleResolution: "node"/ node10 (TS5107)Both are silenced with
ignoreDeprecations: "6.0", the switch TypeScriptitself documents for the 6.0 transition. Actually migrating these
(
baseUrlaffectssrc/...imports;node→bundlerfor Bun) is aseparate modernization and out of scope here.
Test plan
bun run build(tsc 6.0.3) — exit 0, no type errorsbun test— 246 pass / 0 failbun run lint(biome check) — exit 0