page not show

[yulecc]

[HMR] Waiting for update signal from WDS...
HelloWorld.vue?6890:4 Uncaught TypeError: Cannot read property 'extend' of undefined
at eval (HelloWorld.vue?6890:4)
at Module../node_modules/cache-loader/dist/cjs.js?!./node_modules/babel-loader/lib/index.js!./node_modules/ts-loader/index.js?!./node_modules/cache-loader/dist/cjs.js?!./node_modules/vue-cli-plugin-vue-next/node_modules/vue-loader/dist/index.js?!./src/components/HelloWorld.vue?vue&type=script&lang=ts (app.js:955)
at webpack_require (app.js:790)
at fn (app.js:151)
at eval (HelloWorld.vue?9663:1)
at Module../src/components/HelloWorld.vue?vue&type=script&lang=ts (app.js:1117)
at webpack_require (app.js:790)
at fn (app.js:151)
at eval (HelloWorld.vue?e680:1)
at Module../src/components/HelloWorld.vue (app.js:1105)

[sodatea]

Thanks for submitting this issue! Due to our limited time, we ask you to include a reproduction link to a minimal full reproduction of your problem (for example in a GitHub repository) so we can find what is causing the issue. Thank you for your understanding!

[sodatea]

Closing due to inactivity.