allow to define everything within extensions

packages/core/src/Extension.ts

@@ -8,6 +8,8 @@ import { GlobalAttributes, RawCommands, ExtensionConfig } from './types'
 
 declare module '@tiptap/core' {
   interface ExtensionConfig<Options = any> {
+    [key: string]: any;
+
     /**
      * Name
      */

packages/core/src/Mark.ts

@@ -18,6 +18,8 @@ import { Editor } from './Editor'
 
 declare module '@tiptap/core' {
   export interface MarkConfig<Options = any> {
+    [key: string]: any;
+
     /**
      * Name
      */

packages/core/src/Node.ts

@@ -19,6 +19,8 @@ import { Editor } from './Editor'
 
 declare module '@tiptap/core' {
   interface NodeConfig<Options = any> {
+    [key: string]: any;
+
     /**
      * Name
      */