运行yarn serve报错Cannot read property '0' of undefined

[kenjiding]

运行yarn serve报错

使用vue create vue3搭建了项目，然后使用vue add vue-next，再运行yarn serve打开网页就报以下错误

vue-cli版本：4.3.1

[xinpingwang]

Assume you have install Vue devtools extensions to your browser, and use vuex in your project

Solution

1. Make following changes to your package.json.
   

2. (or) disable Vue devtools

Problem

I encountered same problem yesterday, This problem is caused by vuejs/core#1107 and introduce in https://github.com/vuejs/vue-next/releases/tag/v3.0.0-beta.7.

when the project start, vuex will emit an vuex:init event to vue devtools, and then vue devtools will try to make a clone of the current vuex state, causes getCleanClone to be invoked. the getCleanClone function, will read store.state.__proto__.

this issue is fixed by vuejs/core@6be2b73, so you can lock vue version to v3.0.0-beta.6, and wait v3.0.0-beta.8 to be released.

[kenjiding]

vuejs/core@6be2b73

thanks, Problem has been solved