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Fixes eslint warning when node type is ChainExpression (#19680)

* Add babel parser which supports ChainExpression

* Add and fix tests for new babel eslint parser

* extract function to mark node

* refactor for compatibility with eslint v7.7.0+

* Update eslint to v7.7.0
Update hook test since eslint now supports nullish coalescing
P
Pascal Fong Kye committed
1396e4a8f5646f35929883cbb449d2c83e7cbc79
Parent: a8500be
Committed by GitHub <noreply@github.com> on 8/29/2020, 8:03:23 PM