Fix crash when class implements itself

Resolves #2495

CHANGELOG.md

@@ -9,6 +9,7 @@
 ## Bug Fixes
 
 -   Fixed an issue where a namespace would not be created for merged function-namespaces which are declared as variables, #2478.
+-   A class which implements itself will no longer cause a crash when rendering HTML, #2495.
 -   Variable functions which have construct signatures will no longer be converted as functions, ignoring the construct signatures.
 -   Fixed an issue where, if the index section was collapsed when loading the page, all content within it would be hidden until expanded, and a member visibility checkbox was changed.
 

src/lib/output/themes/default/templates/hierarchy.tsx

@@ -3,7 +3,14 @@ import type { PageEvent } from "../../../events";
 import { JSX } from "../../../../utils";
 import { ReflectionKind, type ProjectReflection, DeclarationReflection } from "../../../../models";
 
-function fullHierarchy(context: DefaultThemeRenderContext, root: DeclarationReflection) {
+function fullHierarchy(
+    context: DefaultThemeRenderContext,
+    root: DeclarationReflection,
+    seen = new Set<DeclarationReflection>(),
+) {
+    if (seen.has(root)) return;
+    seen.add(root);
+
     // Note: We don't use root.anchor for the anchor, because those are built on a per page basis.
     // And classes/interfaces get their own page, so all the anchors will be empty anyways.
     // Full name should be safe here, since this list only includes classes/interfaces.
@@ -16,10 +23,10 @@ function fullHierarchy(context: DefaultThemeRenderContext, root: DeclarationRefl
             </a>
             <ul>
                 {root.implementedBy?.map((child) => {
-                    return child.reflection && fullHierarchy(context, child.reflection as DeclarationReflection);
+                    return child.reflection && fullHierarchy(context, child.reflection as DeclarationReflection, seen);
                 })}
                 {root.extendedBy?.map((child) => {
-                    return child.reflection && fullHierarchy(context, child.reflection as DeclarationReflection);
+                    return child.reflection && fullHierarchy(context, child.reflection as DeclarationReflection, seen);
                 })}
             </ul>
         </li>