Previously, npm run serve emitted several warnings:
WARNING Compiled with 2 warnings 8:34:12 AM
warning in ./src/App.vue?vue&type=style&index=0&lang=scss&
Module Warning (from ./node_modules/postcss-loader/src/index.js):
Warning
(1068:3) start value has mixed support, consider using flex-start instead
@ ./node_modules/vue-style-loader??ref--8-oneOf-1-0!./node_modules/css-loader/dist/cjs.js??ref--8-oneOf-1-1!./node_modules/vue-loader/lib/loaders/stylePostLoader.js!./node_modules/postcss-loader/src??ref--8-oneOf-1-2!./node_modules/sass-loader/dist/cjs.js??ref--8-oneOf-1-3!./node_modules/cache-loader/dist/cjs.js??ref--0-0!./node_modules/vue-loader/lib??vue-loader-options!./src/App.vue?vue&type=style&index=0&lang=scss& 4:14-416 15:3-20:5 16:22-424
@ ./src/App.vue?vue&type=style&index=0&lang=scss&
@ ./src/App.vue
@ ./src/main.js
@ multi (webpack)-dev-server/client?http://localhost:8080/sockjs-node (webpack)/hot/dev-server.js ./src/main.js
warning in ./src/App.vue?vue&type=style&index=0&lang=scss&
Module Warning (from ./node_modules/postcss-loader/src/index.js):
Warning
(487:3) Gradient has outdated direction syntax. New syntax is like `to left` instead of `right`.
@ ./node_modules/vue-style-loader??ref--8-oneOf-1-0!./node_modules/css-loader/dist/cjs.js??ref--8-oneOf-1-1!./node_modules/vue-loader/lib/loaders/stylePostLoader.js!./node_modules/postcss-loader/src??ref--8-oneOf-1-2!./node_modules/sass-loader/dist/cjs.js??ref--8-oneOf-1-3!./node_modules/cache-loader/dist/cjs.js??ref--0-0!./node_modules/vue-loader/lib??vue-loader-options!./src/App.vue?vue&type=style&index=0&lang=scss& 4:14-416 15:3-20:5 16:22-424
@ ./src/App.vue?vue&type=style&index=0&lang=scss&
@ ./src/App.vue
@ ./src/main.js
@ multi (webpack)-dev-server/client?http://localhost:8080/sockjs-node (webpack)/hot/dev-server.js ./src/main.js