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Add readonly type relationships

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This commit is contained in:
Anders Hejlsberg
2017-07-16 16:51:47 -10:00
parent 201100dd3c
commit b6302f3c84
1 changed files with 7 additions and 0 deletions
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7
src/compiler/checker.ts
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@@ -9265,6 +9265,13 @@ namespace ts {
}
}
}
else if (target.flags & TypeFlags.Readonly) {
// A type S or readonly S is related to a readonly T if S is related to T.
const nonReadonlySource = source.flags & TypeFlags.Readonly ? (<ReadonlyTypeVariable>source).type : source;
if (result = isRelatedTo(nonReadonlySource, (<ReadonlyTypeVariable>target).type, reportErrors)) {
return result;
}
}
else if (target.flags & TypeFlags.Index) {
// A keyof S is related to a keyof T if T is related to S.
if (source.flags & TypeFlags.Index) {