Fix bounds check

microsoft · Sep 15, 2022 · 23a1dd4 · 23a1dd4
1 parent 28232ca
commit 23a1dd4
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
@@ -36043,8 +36043,8 @@ namespace ts {
         }
 
         function getEffectiveTypeArgumentAtIndex(node: TypeReferenceNode | ExpressionWithTypeArguments, typeParameters: readonly TypeParameter[], index: number): Type {
-            if (index < typeParameters.length) {
-                return getTypeFromTypeNode(node.typeArguments![index]);
+            if (node.typeArguments && index < node.typeArguments.length) {
+                return getTypeFromTypeNode(node.typeArguments[index]);
             }
             return getEffectiveTypeArguments(node, typeParameters)[index];
         }