Wesley Wigham 169e485d90
Perform excess property checking on intersection and union members (#30853)
* Perform excess property checking on intersection and union members

* Allow partial union props to contain the undefined type

* Add test case from #30771

* Un-terse getPossiblePropertiesOfUnionType side-effecting code

* Fix bug exposed in RWC

* Cache results of getPossiblePropertiesOfUnionType

* Fix whitespace
2019-04-16 21:58:48 -07:00
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