yarn install
yarn run serve
yarn run build
yarn run test
yarn run lint
yarn run test:unit --inspect-brk
vuejs/vue-cli#2590 microsoft/vscode#65087 But also you have to set a debugger statement somewhere in the file. Since this is compiled on the fly, the debugger can't preload the sourcemaps ahead of time. So the debugger statement will give it a brief moment to pause and load sourcemaps.