Update types/index.d.ts

Co-authored-by: Christian Murphy <[email protected]>

Author: guillaumegarcia13

types/index.d.ts

@@ -20,11 +20,11 @@ declare namespace remove {
  * @param options   Whether to drop parent nodes if they had children, but all their children were filtered out
  * @param test      is-compatible test (such as a type)
  */
-declare function remove(tree: Node, test?: Test<Node>): Node
-declare function remove(
-  tree: Node,
+declare function remove<T extends Node>(tree: T, test?: Test<Node>): T | null
+declare function remove<T extends Node>(
+  tree: T,
   options: remove.RemoveOptions = {cascade: true},
   test?: Test<Node>
-): Node
+): T | null
 
 export = remove