side-note:
"webpack":"^4.2"
broke au run
https://github.com/webpack/webpack/issues/6825
TL;DR until fixed always run --watch
Hence the CLI usage survey
Another thing broken in webpack it seems - <require from="*.css">
for build --env prod
https://github.com/webpack-contrib/extract-text-webpack-plugin/issues/763
workaround provided in the issue