add extension keymaps

packages/extension-italic/index.ts

@@ -1,6 +1,12 @@
 import { Mark } from '@tiptap/core'
 import { toggleMark } from 'prosemirror-commands'
 
+declare module '@tiptap/core/src/Editor' {
+  interface Editor {
+    italic(): Editor,
+  }
+}
+
 export default class Italic extends Mark {
 
   name = 'italic'
@@ -23,4 +29,10 @@ export default class Italic extends Mark {
     }
   }
 
+  keys() {
+    return {
+      'Mod-i': () => this.editor.italic(),
+    }
+  }
+
 }