Cleanup

src/util/extend.ts

@@ -5,12 +5,12 @@
  */
 export type CommonKeys<A, B> = Extract<keyof A, keyof B>
 
-/**
- * Merges an inheritance tree defined by an array of types, considering overrides.
- * @template T - An array of types representing the inheritance tree.
- */
-export type Extend<T extends readonly any[]> = (
-    T extends [infer Super, infer Self, ...infer Rest]
+export type Extend<T extends readonly object[]> = (
+    T extends [
+        infer Super,
+        infer Self,
+        ...infer Rest extends object[],
+    ]
         ? Pick<Self, CommonKeys<Self, Super>> extends Pick<Super, CommonKeys<Self, Super>>
             ? Extend<[
                 Omit<Super, CommonKeys<Self, Super>> & Self,
@@ -19,7 +19,7 @@ export type Extend<T extends readonly any[]> = (
             : never
         : T extends [infer Self]
             ? Self
-            : void
+            : {}
 )
 
 /**