don’t use __vue__

packages/vue-2/src/Editor.ts

@@ -0,0 +1,12 @@
+import { Editor as CoreEditor } from '@tiptap/core'
+import Vue from 'vue'
+
+declare module '@tiptap/core' {
+  interface Editor {
+    contentComponent: Vue | null,
+  }
+}
+
+export class Editor extends CoreEditor {
+  public contentComponent: Vue | null = null
+}