Properly handle private and protected properties in intersections #13990
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With this PR we properly handle
private
andprotected
properties in intersection types. This fixes several issues related to use ofprivate
andprotected
in mixins (which use intersections to construct the resulting types).This PR also introduces a new
CheckFlags
enum type representing bit flags that are present in everyTransientSymbol
(i.e. every symbol created by the type checker) and moves theInstantiated
andSyntheticProperty
flags fromSymbolFlags
to the newCheckFlags
. Furthermore, theMerged
flag is removed fromSymbolFlags
since theTransient
flag already provides the same information.Fixes #13830.
Fixes #13924.