Retain existing config when calling configure on Marks and Extensions

packages/core/src/Extension.ts

@@ -340,7 +340,7 @@ export class Extension<Options = any, Storage = any> {
   configure(options: Partial<Options> = {}) {
     // return a new instance so we can use the same extension
     // with different calls of `configure`
-    const extension = this.extend()
+    const extension = this.extend(this.config)
 
     extension.options = mergeDeep(this.options as Record<string, any>, options) as Options
 

packages/core/src/Mark.ts

@@ -464,7 +464,7 @@ export class Mark<Options = any, Storage = any> {
   configure(options: Partial<Options> = {}) {
     // return a new instance so we can use the same extension
     // with different calls of `configure`
-    const extension = this.extend()
+    const extension = this.extend(this.config)
 
     extension.options = mergeDeep(this.options as Record<string, any>, options) as Options
 

tests/cypress/integration/core/configureExtensions.spec.ts

@@ -0,0 +1,12 @@
+/// <reference types="cypress" />
+
+import { Extension } from '@tiptap/core'
+
+describe('configure extensions', () => {
+  it('should inherit config', () => {
+    const name = 'my-extension'
+    const extension = Extension.create({ name })
+
+    expect(extension.configure().config.name).to.eq(name)
+  })
+})

tests/cypress/integration/core/configureMarks.spec.ts

@@ -0,0 +1,12 @@
+/// <reference types="cypress" />
+
+import { Mark } from '@tiptap/core'
+
+describe('configure marks', () => {
+  it('should inherit config', () => {
+    const exitable = true
+    const mark = Mark.create({ exitable })
+
+    expect(mark.configure().config.exitable).to.eq(true)
+  })
+})