Fix tab_size validation to fall back to default indentation

[bartveneman]

Summary

• The tab_size guard checked Number(tab_size) < 1, but the raw tab_size value (not the coerced number) was used later in SPACE.repeat(tab_size * size).
• A non-numeric tab_size (a JS caller bypassing the TS type, e.g. a value read from user config) coerced to NaN, which passed the old guard (NaN < 1 is false) and silently produced zero-indented output instead of falling back sensibly.
• Fractional tab_size values were silently truncated by String.prototype.repeat instead of being normalized.
• tab_size is now coerced once; any invalid value (non-numeric, fractional, NaN, Infinity, < 1) is silently ignored and the default tab indentation is used instead. This does not throw — it's a fix, not a breaking change.

Test plan

• vitest run — all 259 tests pass (added cases for fractional/NaN/Infinity/non-numeric tab_size, each asserting fallback to default indentation and that no error is thrown)
• tsc --noEmit — no type errors
• oxlint / oxfmt --check — clean

[github-actions]

⚠️ Duplicate Dependencies (found: 22, threshold: 1)

📦 Package	📋 Versions
@babel/parser	2 versions root@ @vitest/coverage-v8@4.1.9 magicast@0.5.3 @babel/parser@7.29.7 root@ tsdown@0.22.3 rolldown-plugin-dts@0.26.0 @babel/generator@8.0.0 @babel/parser@8.0.0
@babel/types	2 versions root@ @vitest/coverage-v8@4.1.9 magicast@0.5.3 @babel/parser@7.29.7 @babel/types@7.29.7 root@ tsdown@0.22.3 rolldown-plugin-dts@0.26.0 @babel/generator@8.0.0 @babel/parser@8.0.0 @babel/types@8.0.0
@babel/helper-string-parser	2 versions root@ @vitest/coverage-v8@4.1.9 magicast@0.5.3 @babel/parser@7.29.7 @babel/types@7.29.7 @babel/helper-string-parser@7.29.7 root@ tsdown@0.22.3 ... @babel/parser@8.0.0 @babel/types@8.0.0 @babel/helper-string-parser@8.0.0
@babel/helper-validator-identifier	2 versions root@ @vitest/coverage-v8@4.1.9 magicast@0.5.3 @babel/parser@7.29.7 @babel/types@7.29.7 @babel/helper-validator-identifier@7.29.7 root@ tsdown@0.22.3 ... @babel/parser@8.0.0 @babel/types@8.0.0 @babel/helper-validator-identifier@8.0.2
@rolldown/binding-wasm32-wasi	2 versions root@ tsdown@0.22.3 rolldown@1.1.3 @rolldown/binding-wasm32-wasi@1.1.3 root@ @vitest/coverage-v8@4.1.9 ... vite@8.1.4 rolldown@1.1.5 @rolldown/binding-wasm32-wasi@1.1.5
picomatch	2 versions root@ @vitest/coverage-v8@4.1.9 ... tinyglobby@0.2.17 fdir@6.5.0 picomatch@4.0.4 root@ @vitest/coverage-v8@4.1.9 vitest@4.1.9 @vitest/mocker@4.1.9 vite@8.1.4 picomatch@4.0.5
rolldown	2 versions root@ tsdown@0.22.3 rolldown@1.1.3 root@ @vitest/coverage-v8@4.1.9 vitest@4.1.9 @vitest/mocker@4.1.9 vite@8.1.4 rolldown@1.1.5
@oxc-project/types	2 versions root@ tsdown@0.22.3 rolldown@1.1.3 @oxc-project/types@0.137.0 root@ @vitest/coverage-v8@4.1.9 ... vite@8.1.4 rolldown@1.1.5 @oxc-project/types@0.139.0
@rolldown/binding-android-arm64	2 versions root@ tsdown@0.22.3 rolldown@1.1.3 @rolldown/binding-android-arm64@1.1.3 root@ @vitest/coverage-v8@4.1.9 ... vite@8.1.4 rolldown@1.1.5 @rolldown/binding-android-arm64@1.1.5
@rolldown/binding-darwin-arm64	2 versions root@ tsdown@0.22.3 rolldown@1.1.3 @rolldown/binding-darwin-arm64@1.1.3 root@ @vitest/coverage-v8@4.1.9 ... vite@8.1.4 rolldown@1.1.5 @rolldown/binding-darwin-arm64@1.1.5
@rolldown/binding-darwin-x64	2 versions root@ tsdown@0.22.3 rolldown@1.1.3 @rolldown/binding-darwin-x64@1.1.3 root@ @vitest/coverage-v8@4.1.9 ... vite@8.1.4 rolldown@1.1.5 @rolldown/binding-darwin-x64@1.1.5
@rolldown/binding-freebsd-x64	2 versions root@ tsdown@0.22.3 rolldown@1.1.3 @rolldown/binding-freebsd-x64@1.1.3 root@ @vitest/coverage-v8@4.1.9 ... vite@8.1.4 rolldown@1.1.5 @rolldown/binding-freebsd-x64@1.1.5
@rolldown/binding-linux-arm-gnueabihf	2 versions root@ tsdown@0.22.3 rolldown@1.1.3 @rolldown/binding-linux-arm-gnueabihf@1.1.3 root@ @vitest/coverage-v8@4.1.9 ... vite@8.1.4 rolldown@1.1.5 @rolldown/binding-linux-arm-gnueabihf@1.1.5
@rolldown/binding-linux-arm64-gnu	2 versions root@ tsdown@0.22.3 rolldown@1.1.3 @rolldown/binding-linux-arm64-gnu@1.1.3 root@ @vitest/coverage-v8@4.1.9 ... vite@8.1.4 rolldown@1.1.5 @rolldown/binding-linux-arm64-gnu@1.1.5
@rolldown/binding-linux-arm64-musl	2 versions root@ tsdown@0.22.3 rolldown@1.1.3 @rolldown/binding-linux-arm64-musl@1.1.3 root@ @vitest/coverage-v8@4.1.9 ... vite@8.1.4 rolldown@1.1.5 @rolldown/binding-linux-arm64-musl@1.1.5
@rolldown/binding-linux-ppc64-gnu	2 versions root@ tsdown@0.22.3 rolldown@1.1.3 @rolldown/binding-linux-ppc64-gnu@1.1.3 root@ @vitest/coverage-v8@4.1.9 ... vite@8.1.4 rolldown@1.1.5 @rolldown/binding-linux-ppc64-gnu@1.1.5
@rolldown/binding-linux-s390x-gnu	2 versions root@ tsdown@0.22.3 rolldown@1.1.3 @rolldown/binding-linux-s390x-gnu@1.1.3 root@ @vitest/coverage-v8@4.1.9 ... vite@8.1.4 rolldown@1.1.5 @rolldown/binding-linux-s390x-gnu@1.1.5
@rolldown/binding-linux-x64-gnu	2 versions root@ tsdown@0.22.3 rolldown@1.1.3 @rolldown/binding-linux-x64-gnu@1.1.3 root@ @vitest/coverage-v8@4.1.9 ... vite@8.1.4 rolldown@1.1.5 @rolldown/binding-linux-x64-gnu@1.1.5
@rolldown/binding-linux-x64-musl	2 versions root@ tsdown@0.22.3 rolldown@1.1.3 @rolldown/binding-linux-x64-musl@1.1.3 root@ @vitest/coverage-v8@4.1.9 ... vite@8.1.4 rolldown@1.1.5 @rolldown/binding-linux-x64-musl@1.1.5
@rolldown/binding-openharmony-arm64	2 versions root@ tsdown@0.22.3 rolldown@1.1.3 @rolldown/binding-openharmony-arm64@1.1.3 root@ @vitest/coverage-v8@4.1.9 ... vite@8.1.4 rolldown@1.1.5 @rolldown/binding-openharmony-arm64@1.1.5
@rolldown/binding-win32-arm64-msvc	2 versions root@ tsdown@0.22.3 rolldown@1.1.3 @rolldown/binding-win32-arm64-msvc@1.1.3 root@ @vitest/coverage-v8@4.1.9 ... vite@8.1.4 rolldown@1.1.5 @rolldown/binding-win32-arm64-msvc@1.1.5
@rolldown/binding-win32-x64-msvc	2 versions root@ tsdown@0.22.3 rolldown@1.1.3 @rolldown/binding-win32-x64-msvc@1.1.3 root@ @vitest/coverage-v8@4.1.9 ... vite@8.1.4 rolldown@1.1.5 @rolldown/binding-win32-x64-msvc@1.1.5

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📦 Package Bundle Size

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