fix some types

packages/extension-heading/index.ts

@@ -6,7 +6,7 @@ import { textblockTypeInputRule } from 'prosemirror-inputrules'
 type Level = 1 | 2 | 3 | 4 | 5 | 6
 
 interface HeadingOptions {
-  levels?: Level[],
+  levels: Level[],
 }
 
 declare module '@tiptap/core/src/Editor' {
@@ -19,6 +19,10 @@ export default class Heading extends Node {
 
   name = 'heading'
 
+  constructor(options: Partial<HeadingOptions> = {}) {
+    super(options)
+  }
+
   defaultOptions(): HeadingOptions {
     return {
       levels: [1, 2, 3, 4, 5, 6],