TypeScript:optionals

Build 18554 on 12153-fix-controls-from-args
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BaselineBuild 18039 on pull/11768
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LatestBuild 18554 on 12153-fix-controls-from-args
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The baseline is taller than the new snapshot (1169x1100 to 1169x972).
Baseline History
Build 185542b148ee
Current build. There are unaccepted changes, so build 18039 is still the baseline.
Build 18039054947a current baseline
Accepted by Michael Shilman.
Build 18030b8dc809
Accepted by Dominic Nguyen.
Build 1791674b9764
Accepted by Michael Shilman.
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