[lexical][lexical-overflow] Refactor: simplified removeText and insertText rewrite (part 1) (#6456)

Co-authored-by: EgonBolton <43938777+EgonBolton@users.noreply.github.com>
Co-authored-by: Bob Ippolito <bob@redivi.com>

packages/lexical-overflow/src/index.ts

@@ -15,6 +15,7 @@ import type {
 } from 'lexical';
 
 import {$applyNodeReplacement, ElementNode} from 'lexical';
+import invariant from 'shared/invariant';
 
 export type SerializedOverflowNode = SerializedElementNode;
 
@@ -72,6 +73,15 @@ export class OverflowNode extends ElementNode {
   excludeFromCopy(): boolean {
     return true;
   }
+
+  static transform(): (node: LexicalNode) => void {
+    return (node: LexicalNode) => {
+      invariant($isOverflowNode(node), 'node is not a OverflowNode');
+      if (node.isEmpty()) {
+        node.remove();
+      }
+    };
+  }
 }
 
 export function $createOverflowNode(): OverflowNode {