James Beavers 80aa7dc3c6 Add optional-chaining and nullish-coalescing to preset-env (#10811) ...

* Add support for optional-chaining (stage 4) in present-env

* revert babel-preset-env built-in-modules.json

* add shipped proposal syntax map entry, optional chaining

* update remaining syntax plugin references, proposal description

* Add support for nullish coalescing operator in preset-env

* selectively enable sort-keys rule

* enforce sort-keys on shipped-proposals

* don't use Object.entries()

* Update fixtures

2020-01-10 22:07:43 +01:00

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