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馃 Pick PR #46614 (Check for type parameters on origin...) into release-4.5 #46675

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merged 1 commit into from Nov 3, 2021
Merged

馃 Pick PR #46614 (Check for type parameters on origin...) into release-4.5 #46675

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3 changes: 2 additions & 1 deletion src/compiler/checker.ts
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Expand Up @@ -34730,7 +34730,8 @@ 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)));
}
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10 changes: 10 additions & 0 deletions tests/cases/fourslash/stringLiteralTypeCompletionsInTypeArgForNonGeneric1.ts
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@@ -0,0 +1,10 @@
/// <reference path="./fourslash.ts" />

////interface Foo {}
////type Bar = {};
////
////let x: Foo<"/*1*/">;
////let y: Bar<"/*2*/">;

verify.completions({ marker: test.markers() });