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Check for type parameters on the original type when asking for the type argument constraint.

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Daniel Rosenwasser
2021-11-01 09:17:03 +00:00
committed by GitHub
parent e77514a53b
commit 3c0d51b3ed
1 changed files with 2 additions and 1 deletions
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src/compiler/checker.ts
+2 -1
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@@ -34729,7 +34729,8 @@ namespace ts {
function getTypeArgumentConstraint(node: TypeNode): Type | undefined {
const typeReferenceNode = tryCast(node.parent, isTypeReferenceType);
if (!typeReferenceNode) return undefined;
const typeParameters = getTypeParametersForTypeReference(typeReferenceNode)!; // TODO: GH#18217
const typeParameters = getTypeParametersForTypeReference(typeReferenceNode);
if (!typeParameters) return undefined;
const constraint = getConstraintOfTypeParameter(typeParameters[typeReferenceNode.typeArguments!.indexOf(node)]);
return constraint && instantiateType(constraint, createTypeMapper(typeParameters, getEffectiveTypeArguments(typeReferenceNode, typeParameters)));
}