Anders Hejlsberg 15fae38b39

Improve narrowing of generic types in control flow analysis (#43183) ...

* Narrow type variables with union constraints when merited by contextual type

* Narrow generics with union type constraints as indicated by contextual type

* Accept new baselines

* Add tests

* Fix circularity for JSX elements

* Remove unnecessary isConstraintPosition information from flow cache key

* Update comment

* Add additional tests

* Rename to getNarrowableTypeForReference, remove getConstraintForLocation

* Add comment

* Fix removal of undefined in destructurings with initializers

* Use getContextFreeTypeOfExpression in discriminateContextualTypeByObjectMembers

* In obj[x], use constraint of obj's type only when x's type is non-generic

* Add comment

2021-03-19 17:12:57 -07:00

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baselines/reference

Improve narrowing of generic types in control flow analysis (#43183)

2021-03-19 17:12:57 -07:00

cases

Improve narrowing of generic types in control flow analysis (#43183)

2021-03-19 17:12:57 -07:00

lib

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