Lexical: Imported core lexical libs

Imported at 0.17.1, Modified to work in-app.
Added & configured test dependancies.
Tests need to be altered to avoid using non-included deps including
react dependancies.

resources/js/wysiwyg/lexical/core/LexicalGC.ts

@@ -0,0 +1,125 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ */
+
+import type {ElementNode} from '.';
+import type {LexicalEditor} from './LexicalEditor';
+import type {EditorState} from './LexicalEditorState';
+import type {NodeKey, NodeMap} from './LexicalNode';
+
+import {$isElementNode} from '.';
+import {cloneDecorators} from './LexicalUtils';
+
+export function $garbageCollectDetachedDecorators(
+  editor: LexicalEditor,
+  pendingEditorState: EditorState,
+): void {
+  const currentDecorators = editor._decorators;
+  const pendingDecorators = editor._pendingDecorators;
+  let decorators = pendingDecorators || currentDecorators;
+  const nodeMap = pendingEditorState._nodeMap;
+  let key;
+
+  for (key in decorators) {
+    if (!nodeMap.has(key)) {
+      if (decorators === currentDecorators) {
+        decorators = cloneDecorators(editor);
+      }
+
+      delete decorators[key];
+    }
+  }
+}
+
+type IntentionallyMarkedAsDirtyElement = boolean;
+
+function $garbageCollectDetachedDeepChildNodes(
+  node: ElementNode,
+  parentKey: NodeKey,
+  prevNodeMap: NodeMap,
+  nodeMap: NodeMap,
+  nodeMapDelete: Array<NodeKey>,
+  dirtyNodes: Map<NodeKey, IntentionallyMarkedAsDirtyElement>,
+): void {
+  let child = node.getFirstChild();
+
+  while (child !== null) {
+    const childKey = child.__key;
+    // TODO Revise condition below, redundant? LexicalNode already cleans up children when moving Nodes
+    if (child.__parent === parentKey) {
+      if ($isElementNode(child)) {
+        $garbageCollectDetachedDeepChildNodes(
+          child,
+          childKey,
+          prevNodeMap,
+          nodeMap,
+          nodeMapDelete,
+          dirtyNodes,
+        );
+      }
+
+      // If we have created a node and it was dereferenced, then also
+      // remove it from out dirty nodes Set.
+      if (!prevNodeMap.has(childKey)) {
+        dirtyNodes.delete(childKey);
+      }
+      nodeMapDelete.push(childKey);
+    }
+    child = child.getNextSibling();
+  }
+}
+
+export function $garbageCollectDetachedNodes(
+  prevEditorState: EditorState,
+  editorState: EditorState,
+  dirtyLeaves: Set<NodeKey>,
+  dirtyElements: Map<NodeKey, IntentionallyMarkedAsDirtyElement>,
+): void {
+  const prevNodeMap = prevEditorState._nodeMap;
+  const nodeMap = editorState._nodeMap;
+  // Store dirtyElements in a queue for later deletion; deleting dirty subtrees too early will
+  // hinder accessing .__next on child nodes
+  const nodeMapDelete: Array<NodeKey> = [];
+
+  for (const [nodeKey] of dirtyElements) {
+    const node = nodeMap.get(nodeKey);
+    if (node !== undefined) {
+      // Garbage collect node and its children if they exist
+      if (!node.isAttached()) {
+        if ($isElementNode(node)) {
+          $garbageCollectDetachedDeepChildNodes(
+            node,
+            nodeKey,
+            prevNodeMap,
+            nodeMap,
+            nodeMapDelete,
+            dirtyElements,
+          );
+        }
+        // If we have created a node and it was dereferenced, then also
+        // remove it from out dirty nodes Set.
+        if (!prevNodeMap.has(nodeKey)) {
+          dirtyElements.delete(nodeKey);
+        }
+        nodeMapDelete.push(nodeKey);
+      }
+    }
+  }
+  for (const nodeKey of nodeMapDelete) {
+    nodeMap.delete(nodeKey);
+  }
+
+  for (const nodeKey of dirtyLeaves) {
+    const node = nodeMap.get(nodeKey);
+    if (node !== undefined && !node.isAttached()) {
+      if (!prevNodeMap.has(nodeKey)) {
+        dirtyLeaves.delete(nodeKey);
+      }
+      nodeMap.delete(nodeKey);
+    }
+  }
+}