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Always infer between distinct type references to same target

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This commit is contained in:
Anders Hejlsberg 2019-07-20 14:33:35 -07:00
parent 6b29060111
commit 2541a5d0ff
1 changed files with 6 additions and 1 deletions
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7
src/compiler/checker.ts
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@ -15958,9 +15958,14 @@ namespace ts {
}
}
function isTypeReferenceToSameTarget(source: Type, target: Type) {
return !!(getObjectFlags(source) & ObjectFlags.Reference && getObjectFlags(target) & ObjectFlags.Reference &&
(<TypeReference>source).target === (<TypeReference>target).target);
}
function typeIdenticalToSomeType(type: Type, types: Type[]): boolean {
for (const t of types) {
if (isTypeIdenticalTo(t, type)) {
if (t === type || !isTypeReferenceToSameTarget(t, type) && isTypeIdenticalTo(t, type)) {
return true;
}
}