Add generic variable to Collection

konva.d.ts

@@ -1031,12 +1031,13 @@ declare namespace Konva {
     fontStyle(fontStyle: string): this;
   }
 
-  class Collection {
-    [i: number]: any;
-    static toCollection(arr: any[]): Collection;
-    each(f: (el: Node) => void): void;
-    toArray(): any[];
+  class Collection<T extends Node = Node> {
+    [i: number]: T;
+    each(f: (el: T) => void): void;
+    toArray(): T[];
     length: number;
+
+    static toCollection<T extends Node = Node>(arr: T[]): Collection<T>;
   }
 
   class Transform {