New strictness flags shipping after 5.5: noUncheckedIndexedAccess, exactOptionalPropertyTypes, noImplicitOverride, and 5.6 noCheck interactions with isolatedDeclarations.
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How do `noUncheckedIndexedAccess`, `exactOptionalPropertyTypes` and TS 5.6+ checks harden 2025 codebases?
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strictnoUncheckedIndexedAccess
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Dossier 35 of 70 decoded in the TypeScript track. One more won't hurt.