I generated an app using vue-cli 3.0.0-rc.3
Now I want to debug it using Visual Studio Code (Debugger for Chrome) however I can't seem to find the option to turn on sourceMaps.
I set the breakpoint in VSCode but it is not hit. If I specify: "sourceMaps: true" in vue.config.js, I got an error "Invalid options in vue.config.js: "sourceMaps" is not allowed"
What option needs to be set for debugging to work?