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Simplify nested indexed access types

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This commit is contained in:
Anders Hejlsberg
2018-06-03 08:57:15 -07:00
parent 667de4bbb9
commit 55d4d7b5c6
1 changed files with 3 additions and 1 deletions
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4
src/compiler/checker.ts
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@@ -8881,7 +8881,9 @@ namespace ts {
return type.simplified === circularConstraintType ? type : type.simplified;
}
type.simplified = circularConstraintType;
const objectType = type.objectType;
// We recursively simplify the object type as it may in turn be an indexed access type. For example, with
// '{ [P in T]: { [Q in U]: number } }[T][U]' we want to first simplify the inner indexed access type.
const objectType = getSimplifiedType(type.objectType);
if (objectType.flags & TypeFlags.Intersection && isGenericObjectType(objectType)) {
// Given an indexed access type T[K], if T is an intersection containing one or more generic types and one or
// more object types with only a string index signature, e.g. '(U & V & { [x: string]: D })[K]', return a