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Merge pull request #31002 from Microsoft/fixIsStringIndexSignatureOnlyType

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Fix isStringIndexSignatureOnlyType function
This commit is contained in:
Anders Hejlsberg
2019-04-17 17:19:34 -07:00
committed by GitHub
parent ea2331bcfb 462caf8d8e
commit 33c3ce9cd0
6 changed files with 82 additions and 1 deletions
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src/compiler/checker.ts
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@@ -12049,7 +12049,7 @@ namespace ts {
}
function isStringIndexSignatureOnlyType(type: Type): boolean {
return type.flags & TypeFlags.Object && getPropertiesOfType(type).length === 0 && getIndexInfoOfType(type, IndexKind.String) && !getIndexInfoOfType(type, IndexKind.Number) ||
return type.flags & TypeFlags.Object && !isGenericMappedType(type) && getPropertiesOfType(type).length === 0 && getIndexInfoOfType(type, IndexKind.String) && !getIndexInfoOfType(type, IndexKind.Number) ||
type.flags & TypeFlags.UnionOrIntersection && every((<UnionOrIntersectionType>type).types, isStringIndexSignatureOnlyType) ||
false;
}