Port babel-parser changes from 2022-01-10 to 2022-02-26#716

Merged

alangpierce merged 3 commits intomainfrom port-babel-parser-2022-01-10-to-2022-02-26

Jul 7, 2022

+589-330

Commits on Jul 6, 2022

Port babel-parser changes from 2022-01-10 to 2022-02-26
alangpierce
committed

Commits on Jul 7, 2022

Add tests for uncovered lines and fix coverage issue in generated file
alangpierce
committed
Update comment to note that TS doesn't even fully handle <<
alangpierce
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