From dd2d1c5e6b28beef218e5ec66aa61fd503d3e09d Mon Sep 17 00:00:00 2001
From: Ryan Cavanaugh <RyanCavanaugh@users.noreply.github.com>
Date: Tue, 15 Jul 2025 09:48:09 -0700
Subject: [PATCH] Was actually needed

---
 src/compiler/checker.ts | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 6292f415009..9cc1abb65a3 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -22206,6 +22206,12 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
                     return true;
                 }
             }
+            if (target.flags & TypeFlags.TypeParameter && (target as TypeParameter).isThisType) {
+                const constraint = getConstraintOfTypeParameter(target as TypeParameter);
+                if (constraint && isTypeRelatedTo(source, constraint, relation)) {
+                    return true;
+                }
+            }
         }
         if (source.flags & TypeFlags.Object && target.flags & TypeFlags.Object) {
             const related = relation.get(getRelationKey(source, target, IntersectionState.None, relation, /*ignoreConstraints*/ false));