maxmustermann/TypeScript
1
0
Fork 0
Code Issues Pull requests Projects Releases Wiki Activity

Preserve type parameter types in narrowing

Browse source
This commit is contained in:
Anders Hejlsberg 2016-09-10 07:13:57 -07:00 committed by Mohamed Hegazy
parent 5c16cb6f32
commit 709b4ebc83
1 changed files with 1 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
src/compiler/checker.ts
View file

@ -8665,7 +8665,7 @@ namespace ts {
// type. Otherwise, the types are completely unrelated, so narrow to an intersection of the
// two types.
const targetType = type.flags & TypeFlags.TypeParameter ? getApparentType(type) : type;
return isTypeSubtypeOf(candidate, targetType) ? candidate :
return isTypeSubtypeOf(candidate, type) ? candidate :
isTypeAssignableTo(type, candidate) ? type :
isTypeAssignableTo(candidate, targetType) ? candidate :
getIntersectionType([type, candidate]);