fix keymaps

packages/core/src/extensions/baseKeymap.ts

@@ -0,0 +1,14 @@
+import { baseKeymap } from 'prosemirror-commands'
+import { createExtension } from '../Extension'
+
+export const BaseKeymap = createExtension({
+  addKeyboardShortcuts() {
+    return baseKeymap
+  },
+})
+
+declare module '../Editor' {
+  interface AllExtensions {
+    BaseKeymap: typeof BaseKeymap,
+  }
+}