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This commit is contained in:
Anders Hejlsberg 2017-02-27 10:19:14 -08:00
parent 6fdd929a66
commit cd87d903a0
1 changed files with 3 additions and 3 deletions
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6
src/compiler/checker.ts
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@ -10041,9 +10041,9 @@ namespace ts {
return f(type) ? type : neverType;
}
// Apply a mapping function to a contextual type and return the resulting type. If the contextual type
// is a union type, the mapping function is applied to each constituent type and a union of the resulting
// types is returned.
// Apply a mapping function to a type and return the resulting type. If the source type
// is a union type, the mapping function is applied to each constituent type and a union
// of the resulting types is returned.
function mapType(type: Type, mapper: (t: Type) => Type): Type {
if (!(type.flags & TypeFlags.Union)) {
return mapper(type);