TypeScript:unions

Build 21103 on pull/12824
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Baseline History
Build 211030472b6c current baseline
Current build. Accepted by Gert Hengeveld.
Build 211029168b45
Ancestor build. There were unaccepted changes, so this was not used as a baseline.
Build 21008e5e9627
Inherited baseline identical to build 20360
Build 203609399648
Accepted by Norbert de Langen.
Build 203406338b8b
Accepted by Norbert de Langen.
Build 19863640fdee
Auto-accepted
Build 19540d7dd658
Accepted by Norbert de Langen.
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