vue-cli TypeError: Cannot read properties of undefined (reading ‘upgrade‘)

今天配置vue.config.js, 配置后，启动项目，报了一个错INFOStarting development server...ERRORTypeError: Cannot read properties of undefined (reading 'upgrade')TypeError: Cannot read properties of undefined (reading 'upgra

peade

13439人浏览 · 2022-04-13 16:20:56

peade · 2022-04-13 16:20:56 发布

今天配置vue.config.js, 配置后，启动项目，报了一个错

 INFO  Starting development server...
 ERROR  TypeError: Cannot read properties of undefined (reading 'upgrade')
TypeError: Cannot read properties of undefined (reading 'upgrade')
    at Server.<anonymous> (/Users/lhf/cguardian/gdmall-blue-pc/node_modules/webpack-dev-server/lib/Server.js:1843:26)
    at Array.forEach (<anonymous>)
    at Server.initialize (/Users/lhf/cguardian/gdmall-blue-pc/node_modules/webpack-dev-server/lib/Server.js:1838:29)
    at Server.start (/Users/lhf/cguardian/gdmall-blue-pc/node_modules/webpack-dev-server/lib/Server.js:3208:16)
    at processTicksAndRejections (node:internal/process/task_queues:96:5)

这个错误报出来，一开始让我难以理解。对比之前的vue.config.js中的配置，完全没有差别。
经过查询资料，stackoverflow 给我了解决问题的答案: I guess your devServer.proxy.target is empty! You could set this configuration

经过验证，确实是devServer.proxy配置中，target没有值。

就是我在配置代理的时候，target是通过环境变量获取的。但是环境变量属性值配置错了，导致报了这个错误。

参考资料:
https://stackoverflow.com/questions/55348996/cannot-read-property-upgrade-of-undefined-when-starting-vue-application