feat(dts-generator): allow changing names in .dtsgenrc overlays (#464)

...at least in deeper levels.
This is required for building type definitions where the pseudo
parameter "this" defines the type on which the method is called.
Declaring this in .dtsgenrc shifts the parameters from JSDoc by one.
Needed for full ControllerExtension support.

packages/dts-generator/src/phases/json-fixer.ts

@@ -67,9 +67,14 @@ function mergeOverlays(apijson: ApiJSON, directives: Directives) {
     obj[prop] = value;
   }
 
-  function mergeProps(obj: { [key: string]: unknown }, overlay: object) {
+  function mergeProps(
+    obj: { [key: string]: unknown },
+    overlay: object,
+    preserveName?: boolean,
+  ) {
     Object.entries(overlay).forEach(([prop, value]) => {
-      if (prop !== "name") {
+      if (prop !== "name" || !preserveName) {
+        // only change name in deeper recursive calls where preserveName flag is not set anymore
         mergeProp(obj, prop, value);
       }
     });
@@ -105,7 +110,7 @@ function mergeOverlays(apijson: ApiJSON, directives: Directives) {
             symbolItems.push(overlayItem);
             return;
           }
-          mergeProps(item, overlayItem);
+          mergeProps(item, overlayItem, true /* preserveName */);
         });
       } else {
         mergeProp(symbol, prop, overlay[prop]);