（electron 报错）TypeError: Cannot read property ‘upgrade‘ of undefined
问题描述
启动electron项目时，报错了TypeError: Cannot read property 'upgrade' of undefined(合并web和electron分支的代码后就报错了，很头大啊！)
ERROR TypeError: Cannot read properties of undefined (reading 'upgrade')
TypeError: Cannot read properties of undefined (reading 'upgrade')
at Server.<anonymous> (F:\code\irs-front\irs-front\node_modules\webpack-dev-server\lib\Server.js:1937:26)
at Array.forEach (<anonymous>)
at Server.initialize (F:\code\irs-front\irs-front\node_modules\webpack-dev-server\lib\Server.js:1932:29)
at Server.start (F:\code\irs-front\irs-front\node_modules\webpack-dev-server\lib\Server.js:3358:16)
at processTicksAndRejections (node:internal/process/task_queues:96:5)
解决方案：
查了资料才发现有个全局变量给注释了
配置文件vue.config.js的devServer有变量是null，配置文件.env.developmentd的process.env.VUE_APP_BASE_URL 给注释了，所以一直报错。打开注释就好了。