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Check mapped type constraint is assignable to string | number

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This commit is contained in:
Anders Hejlsberg 2016-11-10 10:41:17 -08:00
parent de2da2cb72
commit aca1ab3bfe
1 changed files with 6 additions and 5 deletions
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11
src/compiler/checker.ts
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@ -15316,11 +15316,12 @@ namespace ts {
}
function checkMappedType(node: MappedTypeNode) {
getTypeFromMappedTypeNode(node);
// const type = <MappedType>getTypeFromMappedTypeNode(node);
// const constraintType = getConstraintTypeFromMappedType(type);
// const keyType = constraintType.flags & TypeFlags.TypeParameter ? getApparentTypeOfTypeParameter(<TypeParameter>constraintType) : constraintType;
// checkTypeAssignableTo(keyType, stringOrNumberType, node.typeParameter.constraint);
checkSourceElement(node.typeParameter);
checkSourceElement(node.type);
const type = <MappedType>getTypeFromMappedTypeNode(node);
const constraintType = getConstraintTypeFromMappedType(type);
const keyType = constraintType.flags & TypeFlags.TypeParameter ? getApparentTypeOfTypeParameter(<TypeParameter>constraintType) : constraintType;
checkTypeAssignableTo(keyType, stringOrNumberType, node.typeParameter.constraint);
}
function isPrivateWithinAmbient(node: Node): boolean {