feat!: Replace defaultOptions with addOptions (#2088)

* add new addOptions option

* replace defaultOptions with addOptions for all extensions

* replace defaultOptions with addOptions for all demos

* replace defaultOptions with addOptions in docs

* refactoring

* refactoring

* drop object support for addOptions

* fix optional options

* fix tests

docs/guide/custom-extensions.md

@@ -71,9 +71,11 @@ All settings can be configured through the extension anyway, but if you want to
 import Heading from '@tiptap/extension-heading'
 
 const CustomHeading = Heading.extend({
-  defaultOptions: {
-    ...Heading.options,
-    levels: [1, 2, 3],
+  addOptions() {
+    return {
+      ...this.parent(),
+      levels: [1, 2, 3],
+    }
   },
 })
 ```

docs/guide/typescript.md

@@ -26,8 +26,10 @@ export interface CustomExtensionOptions {
 }
 
 const CustomExtension = Extension.create<CustomExtensionOptions>({
-  defaultOptions: {
-    awesomeness: 100,
+  addOptions() {
+    return {
+      awesomeness: 100,
+    }
   },
 })
 ```

docs/overview/upgrade-guide.md

@@ -103,7 +103,7 @@ import { Node } from '@tiptap/core'
 
 const CustomExtension = Node.create({
   name: 'custom_extension',
-  defaultOptions: {
+  addOptions() {
     …
   },
   addAttributes() {