extension name is required now

packages/core/src/Extension.ts

@@ -7,7 +7,7 @@ export interface ExtensionConfig<Options = any, Commands = {}> {
   /**
    * Name
    */
-  name?: string,
+  name: string,
 
   /**
    * Default options

packages/core/src/extensions/commands.ts

@@ -32,6 +32,8 @@ import * as wrapIn from '../commands/wrapIn'
 import * as wrapInList from '../commands/wrapInList'
 
 export const Commands = Extension.create({
+  name: 'commands',
+
   addCommands() {
     return {
       ...blur,

packages/core/src/extensions/editable.ts

@@ -2,6 +2,8 @@ import { Plugin, PluginKey } from 'prosemirror-state'
 import { Extension } from '../Extension'
 
 export const Editable = Extension.create({
+  name: 'editable',
+
   addProseMirrorPlugins() {
     return [
       new Plugin({

packages/core/src/extensions/focusEvents.ts

@@ -2,6 +2,8 @@ import { Plugin, PluginKey } from 'prosemirror-state'
 import { Extension } from '../Extension'
 
 export const FocusEvents = Extension.create({
+  name: 'focusEvents',
+
   addProseMirrorPlugins() {
     const { editor } = this
 

packages/core/src/extensions/keymap.ts

@@ -13,6 +13,8 @@ import { undoInputRule } from 'prosemirror-inputrules'
 import { Extension } from '../Extension'
 
 export const Keymap = Extension.create({
+  name: 'keymap',
+
   addKeyboardShortcuts() {
     const handleBackspace = () => this.editor.commands.first(({ state, dispatch }) => [
       () => undoInputRule(state, dispatch),