fix: support tuple types in DeepStrictObjectKeys#28
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…er union element types
Heterogeneous tuples (e.g., [{ a: 1 }, { b: 2 }]) were losing nested keys because
Infer did not distribute over union element types, causing keyof (A | B) to resolve
to never. Added DistributeInfer wrapper and comprehensive tuple tests.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
DeepStrictObjectKeysto properly handle heterogeneous tuple types (e.g.,[{ a: 1 }, { b: 2 }]) by adding aDistributeInferwrapper that distributes over union element typeskeyof (A | B)resolves toneverwhen A and B share no common keysCloses #6
Test plan
npm run build:test && npm run test— all 338 tests pass (329 existing + 9 new)npm run prettier— formatting applied🤖 Generated with Claude Code