fix bug

packages/extension-link/index.ts

@@ -58,7 +58,7 @@ const Link = createMark({
 
   addCommands() {
     return {
-      link: (options: { href?: string, target?: string }): Command => ({ commands }) => {
+      link: (options: { href?: string, target?: string } = {}): Command => ({ commands }) => {
         if (!options.href) {
           return commands.removeMark('link')
         }
@@ -68,12 +68,6 @@ const Link = createMark({
     }
   },
 
-  addKeyboardShortcuts() {
-    return {
-      'Mod-i': () => this.editor.italic(),
-    }
-  },
-
   addPasteRules() {
     return [
       markPasteRule(pasteRegex, this.type, (url: string) => ({ href: url })),