refa: article (#757)

Signed-off-by: bggRGjQaUbCoE <githubaccount56556@proton.me>

lib/models/dynamics/opus_detail/node.dart

@@ -0,0 +1,30 @@
+import 'rich.dart';
+import 'word.dart';
+
+class Node {
+  String? type;
+  Word? word;
+  Rich? rich;
+
+  Node({
+    this.type,
+    this.word,
+    this.rich,
+  });
+
+  factory Node.fromJson(Map<String, dynamic> json) => Node(
+        type: json['type'] as String?,
+        word: json['word'] == null
+            ? null
+            : Word.fromJson(json['word'] as Map<String, dynamic>),
+        rich: json['rich'] == null
+            ? null
+            : Rich.fromJson(json['rich'] as Map<String, dynamic>),
+      );
+
+  Map<String, dynamic> toJson() => {
+        'type': type,
+        'word': word?.toJson(),
+        'rich': rich?.toJson(),
+      };
+}