Simplify ChildNode type

Author: mhegazy

baselines/dom.generated.d.ts

@@ -3050,7 +3050,7 @@ declare var CharacterData: {
     new(): CharacterData;
 };
 
-interface ChildNode {
+interface ChildNode extends Node {
     /**
      * Inserts nodes just after node, while replacing strings in nodes with equivalent Text nodes.
      * Throws a "HierarchyRequestError" DOMException if the constraints of
@@ -10215,19 +10215,19 @@ interface Node extends EventTarget {
     /**
      * Returns the children.
      */
-    readonly childNodes: NodeListOf<Node & ChildNode>;
+    readonly childNodes: NodeListOf<ChildNode>;
     /**
      * Returns the first child.
      */
-    readonly firstChild: Node & ChildNode | null;
+    readonly firstChild: ChildNode | null;
     /**
      * Returns true if node is connected and false otherwise.
      */
     readonly isConnected: boolean;
     /**
      * Returns the last child.
      */
-    readonly lastChild: Node & ChildNode | null;
+    readonly lastChild: ChildNode | null;
     /**
      * Returns the next sibling.
      */

inputfiles/overridingTypes.json

@@ -27,6 +27,10 @@
                     }
                 }
             },
+            "ChildNode": {
+                "name": "ChildNode",
+                "extends": "Node"
+            },
             "GlobalEventHandlers": {
                 "name": "GlobalEventHandlers",
                 "events": {
@@ -495,13 +499,13 @@
                             "override-type": "Element | null"
                         },
                         "childNodes": {
-                            "override-type": "NodeListOf<Node & ChildNode>"
+                            "override-type": "NodeListOf<ChildNode>"
                         },
                         "firstChild": {
-                            "override-type": "Node & ChildNode | null"
+                            "override-type": "ChildNode | null"
                         },
                         "lastChild": {
-                            "override-type": "Node & ChildNode | null"
+                            "override-type": "ChildNode | null"
                         }
                     }
                 }