Only display hierarchy if useful

Author: Gerrit0

CHANGELOG.md

@@ -10,6 +10,7 @@
 -   Fixed an infinite loop when `skipLibCheck` is used to ignore some compiler errors, #2438.
 -   `@example` tag titles will now be rendered in the example heading, #2440.
 -   Correctly handle transient symbols in `@namespace`-created namespaces, #2444.
+-   TypeDoc no longer displays the "Hierarchy" section if there is no inheritance hierarchy to display.
 
 ### Thanks!
 

src/lib/converter/plugins/TypePlugin.ts

@@ -158,7 +158,10 @@ export class TypePlugin extends ConverterComponent {
                 push(reflection.extendedBy);
             }
 
-            reflection.typeHierarchy = root;
+            // No point setting up a hierarchy if there is no hierarchy to display
+            if (root.next) {
+                reflection.typeHierarchy = root;
+            }
         });
     }
 }