Issues:8143-ts-imported-types

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Baseline History
Build 211335a913e4
Current build. There are unaccepted changes, so build 20999 is still the baseline.
Build 20999e0d2475 current baseline
Accepted by Michael Shilman.
Build 19863640fdee
Auto-accepted
Build 18039054947a
Accepted by Michael Shilman.
Build 18030b8dc809
Accepted by Dominic Nguyen.
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