Fixes nodes option in serialize function

.changeset/loud-days-rule.md

@@ -0,0 +1,5 @@
+---
+"@udecode/plate-markdown": patch
+---
+
+Fixes nodes option in serialize function

apps/www/content/docs/en/markdown.mdx

@@ -131,7 +131,7 @@ Converts the current Slate value to a Markdown string.
 
 <API name="serialize">
 <APIOptions type="SerializeMarkdownOptions">
-  <APIItem name="nodes" type="Descendant[]" optional>
+  <APIItem name="value" type="Descendant[]" optional>
     The Slate nodes to serialize. If not provided, the entire editor value will be used.
   </APIItem>
 </APIOptions>

packages/markdown/src/lib/serializer/serializeMd.ts

@@ -12,13 +12,15 @@ import { serializeMdNodes } from './serializeMdNodes';
 /** Serialize the editor value to Markdown. */
 export const serializeMd = (
   editor: SlateEditor,
-  options?: Parameters<typeof serializeMdNodes>['1']
+  options?: { value?: Parameters<typeof serializeMdNodes>['0'] } & Parameters<
+    typeof serializeMdNodes
+  >['1']
 ) => {
   const plugins = editor.pluginList.filter(
     (p) => p.node.isElement || p.node.isLeaf
   );
 
-  const nodes = plugins.reduce(
+  const pluginNodes = plugins.reduce(
     (acc, plugin) => {
       (acc as any)[plugin.key] = {
         isLeaf: plugin.node.isLeaf,
@@ -31,8 +33,10 @@ export const serializeMd = (
     {} as SerializeMdOptions['nodes']
   );
 
-  return serializeMdNodes(editor.children, {
+  const nodesToSerialize = options?.value ?? editor.children;
+
+  return serializeMdNodes(nodesToSerialize, {
     ...options,
-    nodes: merge(nodes, options?.nodes),
+    nodes: merge(pluginNodes, options?.nodes),
   });
 };