vue报错:TypeError: Class extends value undefined is not a constructor or null

根据报错可得是mini-css-extract-plugin这个插件有问题

解决方案:
方法1:

npm install --save-dev mini-css-extract-plugin //在项目开发依赖中安装
//如果安装出现报错,可使用
npm install --save-dev mini-css-extract-plugin --force

方法2:

npm install webpack -g // 全局安装
npm install webpack --save-dev //在项目开发依赖中安装
PS E:\java-study-item\jeecgboot-vue2\ant-design-vue-jeecg> npm run build:test > vue-antd-jeecg@3.4.3 build:test E:\java-study-item\jeecgboot-vue2\ant-design-vue-jeecg > vue-cli-service build --mode test - Building for test... 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> (E:\java-study-item\jeecgboot-vue2\ant-design-vue-jeecg\node_modules\mini-css-extract-plugin\dist\CssDependency.js:12:46) at Module._compile (internal/modules/cjs/loader.js:1201:30) at Object.Module._extensions..js (internal/modules/cjs/loader.js:1221:10) at Module.load (internal/modules/cjs/loader.js:1050:32) at Function.Module._load (internal/modules/cjs/loader.js:938:14) at Module.require (internal/modules/cjs/loader.js:1090:19) at require (internal/modules/cjs/helpers.js:75:18) at Object.<anonymous> (E:\java-study-item\jeecgboot-vue2\ant-design-vue-jeecg\node_modules\mini-css-extract-plugin\dist\index.js:12:45) at Module._compile (internal/modules/cjs/loader.js:1201:30) at Object.Module._extensions..js (internal/modules/cjs/loader.js:1221:10) at Module.load (internal/modules/cjs/loader.js:1050:32) at Function.Module._load (internal/modules/cjs/loader.js:938:14) at Module.require (internal/modules/cjs/loader.js:1090:19) at require (internal/modules/cjs/helpers.js:75:18) at Object.<anonymous> (E:\java-study-item\jeecgboot-vue2\ant-design-vue-jeecg\node_modules\mini-css-extract-plugin\dist\cjs.js:3:18) at Module._compile (internal/modules/cjs/loader.js:1201:30) npm ERR! code ELIFECYCLE npm ERR! errno 1 npm ERR! vue-antd-jeecg@3.4.3 build:test: `vue-cli-service build --mode test` npm ERR! Exit status 1 npm ERR! npm ERR! Failed at the vue-antd-jeecg@3.4.3 build:test script. npm ERR! This is probably not a problem with npm. There is likely additional logging output above. npm ERR! A complete log of this run can b
03-31
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