Fix inheritDoc from signature to non-signature

CHANGELOG.md

@@ -47,6 +47,7 @@
 ### Bug Fixes
 
 -   TypeDoc will now ignore package.json files not containing a `name` field, #2190.
+-   Fixed `@inheritDoc` on signatures (functions, methods, constructors, getters, setters) being unable to inherit from a non-signature.
 
 ### Thanks!
 

src/lib/converter/plugins/InheritDocPlugin.ts

@@ -73,7 +73,8 @@ export class InheritDocPlugin extends ConverterComponent {
                     const index = reflection.parent
                         .getAllSignatures()
                         .indexOf(reflection);
-                    sourceRefl = sourceRefl.getAllSignatures()[index];
+                    sourceRefl =
+                        sourceRefl.getAllSignatures()[index] || sourceRefl;
                 }
             }
 

src/test/behaviorTests.ts

@@ -365,6 +365,25 @@ export const behaviorTests: {
         );
     },
 
+    inheritDocSignature(project) {
+        const test1 = query(project, "SigRef.test1");
+        equal(test1.signatures?.length, 2);
+        equal(
+            Comment.combineDisplayParts(test1.signatures[0].comment?.summary),
+            "A"
+        );
+        equal(
+            Comment.combineDisplayParts(test1.signatures[1].comment?.summary),
+            "B"
+        );
+
+        const test2 = query(project, "SigRef.test2");
+        equal(
+            Comment.combineDisplayParts(test2.signatures?.[0].comment?.summary),
+            "C"
+        );
+    },
+
     inheritDocWarnings(project, logger) {
         const target1 = query(project, "target1");
         equal(Comment.combineDisplayParts(target1.comment?.summary), "Source");

src/test/converter2/behavior/inheritDocSignature.ts

@@ -0,0 +1,27 @@
+// TS Discord March 24 2023 bug
+// See https://discord.com/channels/508357248330760243/829307039447515176/1088969324770897931
+
+export class SigRef {
+    /** A */
+    method(): void;
+    /** B */
+    method(x: string): string;
+    method(x?: string) {
+        return x;
+    }
+
+    /** C */
+    prop = 2;
+
+    /** {@inheritDoc method} */
+    test1(): void;
+
+    /** {@inheritDoc method} */
+    test1(x: string): string;
+    test1(x?: string) {
+        return x;
+    }
+
+    /** {@inheritDoc prop} */
+    test2() {}
+}