refactor(useNodesData): improve selector equality function (#3976)

* improved selector equality function for useNodesData

* fixed selector & useNodesData example

* added shallow-node-data as system function

examples/react/src/examples/UseNodesData/index.tsx

@@ -20,8 +20,8 @@ export type ResultNode = Node<{}, 'result'>;
 export type UppercaseNode = Node<{ text: string }, 'uppercase'>;
 export type MyNode = TextNode | ResultNode | UppercaseNode;
 
-export function isTextNode(node: any): node is TextNode {
-  return node.type === 'text';
+export function isTextNode(node: any): node is TextNode | UppercaseNode {
+  return node.type === 'text' || node.type === 'uppercase';
 }
 
 const nodeTypes = {

examples/svelte/src/routes/examples/usenodesdata/+page.svelte

@@ -5,8 +5,8 @@
 	type UppercaseNodeType = Node<{ text: string }, 'uppercase'>;
 	type ResultNodeType = Node<{}, 'result'>;
 
-	export function isTextNode(node: any): node is TextNodeType {
-		return node.type === 'text';
+	export function isTextNode(node: any): node is TextNodeType | UppercaseNode {
+		return node.type === 'text' || node.type === 'uppercase';
 	}
 
 	export type MyNode = TextNodeType | UppercaseNodeType | ResultNodeType;