我想创建一个组件通信的bus，为什么这里会报错呢？

import Vue from 'vue';  
const bus = new Vue();  
console.log(bus);  
import topTitle from '/components/topTitle';  
import search from '/components/search';  
import productCate from '/components/productCate';  
import products from '/components/products';  
import tabBar from '/components/tabBar';  
export default{  
    data(){  
        return {  
            // bus  
        };  
    },  
    components:{  
        Vue,topTitle,search,productCate,products,tabBar  
    }  
}  

报错：e.runtime.esm.js:1394 SyntaxError: The requested module '/@fs/D:/HBuilderX/plugins/uniapp-cli-vite/node_modules/@dcloudio/uni-h5-vue/dist/vue.runtime.esm.js' does not provide an export named 'default' (at productlist.vue:14:9)
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