尝试用作前缀

import "package:fuodz/widgets/menu_item.dart" as item;

//code widget

VStack[
  item.MenuItem();
]

或者，将widgets/menu_item.dart中的类名MenuItem更改为其他名称

import 'package:flutter/material.dart';
import 'package:Yourprojectname/model/menu_item.dart' as item;

class MenuItems{  
  static List<item.MenuItem> itemFirst = [
    itemShare,
  ]; 
  static List<item.MenuItem> itemSecond = [
    itemSignOut,
  ];
  static const itemShare = item.MenuItem(
    text: 'Alarm',
    icon: Icons.alarm,
  );
  static const itemSignOut = item.MenuItem(
    text: 'Sign Out',
    icon: Icons.logout,
  );
}