<script>\n import * as Vue from 'vue'\nimport Component from 'vue-class-component'\n\n@Component\nexport default class HelloWorld extends Vue {\n //my operation\n}\n\n</script>\n这是一个简单的示例vue-class-component。\n但是，当我运行我的项目时，浏览器显示以下错误：
Uncaught TypeError: Class extends value #<Object> is not a constructor or null\nat eval (HelloWorld.vue?e90b:39:1)\nat Module../node_modules/babel-loader/lib/index.js??clonedRuleSet-40.use[0]!./node_modules/vue-loader/dist/index.js??ruleSet[0].use[0]!./src/components/HelloWorld.vue?vue&type=script&lang=js (app.js:19:1)\nat __webpack_require__ (app.js:315:33)\nat fn (app.js:570:21)\nat eval (HelloWorld.vue?vue&type=script&lang=js:5:213)\nat Module../src/components/HelloWorld.vue?vue&type=script&lang=js (app.js:162:1)\nat __webpack_require__ (app.js:315:33)\nat fn (app.js:570:21)\nat eval (HelloWorld.vue:3:97)\nat Module../src/components/HelloWorld.vue (app.js:140:1)\n为什么会出现这种情况？并且cmd还显示这样的警告：
in ./node_modules/vue-class-component/dist/vue-class-component.esm.js\nexport 'default' (imported as 'Vue') was not found in 'vue' (possible exports: BaseTransition, Comment, EffectScope, Fragment, KeepAlive, ReactiveEffect, Static, …