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Only check if the index type should be deferred for intersection types

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Mateusz Burzyński
2022-08-31 07:50:47 +02:00
parent 00e3926c48
commit 2ba9ff19c8
1 changed files with 1 additions and 4 deletions
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src/compiler/checker.ts
+1 -4
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@@ -15903,13 +15903,10 @@ namespace ts {
}
function distributeIndexOverObjectType(objectType: Type, indexType: Type, writing: boolean) {
if (shouldDeferIndexType(objectType)) {
return;
}
// (T | U)[K] -> T[K] | U[K] (reading)
// (T | U)[K] -> T[K] & U[K] (writing)
// (T & U)[K] -> T[K] & U[K]
if (objectType.flags & TypeFlags.UnionOrIntersection) {
if (objectType.flags & TypeFlags.Union || objectType.flags & TypeFlags.Intersection && !shouldDeferIndexType(objectType)) {
const types = map((objectType as UnionOrIntersectionType).types, t => getSimplifiedType(getIndexedAccessType(t, indexType), writing));
return objectType.flags & TypeFlags.Intersection || writing ? getIntersectionType(types) : getUnionType(types);
}