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rescan gt/lt token after TsAsExpression is parsed - #11912
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PR: Bug Fix 🐛
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When parsing mixture of BinaryExpression and TsAsExpression, e.g.
The
<=is read when we are parsing TsTypeboolean, thus it is read as a single<(tt.relational) token instead of a compound of<=. Here we introduce areScan_lt_gtmethod and re-scan</>so<=can be correctly tokenized. Note that the TypeScript compiler adopted the same approach here:https://github.com/microsoft/TypeScript/blob/624736418132374a6213bd4c66310017ee17d38a/src/compiler/parser.ts#L4329
This PR also fixes the following issue
because
??is read as a pair of?questional instead of nullishCoalescing. Since it is used in Flow exclusively (#8115), I moved the code path to the flow plugin.