add extension class

packages/tiptap-core/src/Node.ts

@@ -0,0 +1,27 @@
+import Extension from './Extension'
+
+export default class Node extends Extension {
+
+  constructor(options = {}) {
+    super(options)
+  }
+
+  // protected type = 'node'
+
+  get type() {
+    return 'node'
+  }
+
+  get view(): any {
+    return null
+  }
+
+  get schema(): any {
+    return null
+  }
+
+  command() {
+    return () => {}
+  }
+
+}