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[api-extractor] Upgrade bundled TypeScript to 5.9#5727

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jahanford wants to merge 5 commits intomicrosoft:mainfrom
jahanford:jahanford/ts-59
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[api-extractor] Upgrade bundled TypeScript to 5.9#5727
jahanford wants to merge 5 commits intomicrosoft:mainfrom
jahanford:jahanford/ts-59

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@jahanford jahanford commented Mar 26, 2026

Summary

Update the api-extractor TypeScript compiler version to 5.9.3.

Details

Would like to work towards updating to TypeScript 6 but updating to last minor release of TypeScript 5 first.

Added skipLibCheck in heft-typescript-v3-test to avoid TypeScript 5.9.3 Uint8Array generic type incompatibility with @types/node@17.0.41

How it was tested

Ran the api-extractor tests _phase:test

Impacted documentation

Updated code comments in TypeScriptInternals.ts to point to updated version and correct lines.

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@microsoft-github-policy-service agree company="Microsoft"

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