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Make boolean assignable to union types containing both true and false

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This commit is contained in:
Anders Hejlsberg
2016-06-24 21:12:44 -07:00
parent 770f42377d
commit e900ebf856
1 changed files with 3 additions and 0 deletions
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3
src/compiler/checker.ts
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@@ -6026,6 +6026,9 @@ namespace ts {
if (result = typeRelatedToSomeType(source, <UnionType>target, reportErrors && !(source.flags & TypeFlags.Primitive))) {
return result;
}
if (source === booleanType && contains((<UnionType>target).types, trueType) && contains((<UnionType>target).types, falseType)) {
return Ternary.True;
}
}
}