Using the flag instead ensures both DEBUG and RELEASE versions of the code is compiled. JIT optimizations will remove the unused code during compilation just the same.
Update style sheets
Install less CSS and minify plugin:
npm install less -g
npm install -g less-plugin-clean-css
Compile styles:
cd webroot/ngax
lessc less/dark.less styles/dark.css --clean-css -m=always
lessc less/default.less styles/default.css --clean-css -m=always
There are warnings about math=always, but to fix those all divisions in .less need to be wrapped in parens.