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Ignore generic mapped types in isStringIndexSignatureOnlyType
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src/compiler/checker.ts

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@@ -12043,7 +12043,7 @@ namespace ts {
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}
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function isStringIndexSignatureOnlyType(type: Type): boolean {
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return type.flags & TypeFlags.Object && getPropertiesOfType(type).length === 0 && getIndexInfoOfType(type, IndexKind.String) && !getIndexInfoOfType(type, IndexKind.Number) ||
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return type.flags & TypeFlags.Object && !isGenericMappedType(type) && getPropertiesOfType(type).length === 0 && getIndexInfoOfType(type, IndexKind.String) && !getIndexInfoOfType(type, IndexKind.Number) ||
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type.flags & TypeFlags.UnionOrIntersection && every((<UnionOrIntersectionType>type).types, isStringIndexSignatureOnlyType) ||
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false;
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}

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