TypeError: Class extends value undefined is not a constructor or null
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$ vue-cli-service build
⠋ Building for production... ERROR TypeError: Class extends value undefined is not a constructor or null
TypeError: Class extends value undefined is not a constructor or null
at Object.<anonymous> (/root/deploy/ui/node_modules/mini-css-extract-plugin/dist/CssDependency.js:12:46)
at Module._compile (module.js:652:30)
at Object.Module._extensions..js (module.js:663:10)
at Module.load (module.js:565:32)
at tryModuleLoad (module.js:505:12)
at Function.Module._load (module.js:497:3)
at Module.require (module.js:596:17)
at require (internal/module.js:11:18)
at Object.<anonymous> (/root/deploy/ui/node_modules/mini-css-extract-plugin/dist/index.js:12:45)
at Module._compile (module.js:652:30)
at Object.Module._extensions..js (module.js:663:10)
at Module.load (module.js:565:32)
at tryModuleLoad (module.js:505:12)
at Function.Module._load (module.js:497:3)
at Module.require (module.js:596:17)
at require (internal/module.js:11:18)
mini-css-extract-plugin requires webpack >= 4.1.0
npm install webpack -g // 全局安装
npm install webpack --save-dev // 项目内安装
或者
npm add webpack@latest --registry=https://registry.npm.taobao.org以上是关于TypeError: Class extends value undefined is not a constructor or null的主要内容，如果未能解决你的问题，请参考以下文章
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关于〈? extends Class 〉和〈T extends Class〉的区别