TypeScript Bot 08ad0e2b88

Cherry-pick PR #42943 into release-4.2 (#42964) ...

Component commits:
361e19bbe8 Ensure no duplicates in named union list

615050437b Add regression test

Co-authored-by: Anders Hejlsberg <andersh@microsoft.com>

2021-02-25 14:18:56 -08:00

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baselines/reference

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lib

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