Webpack
From Tweeki
Using Webpack to customize the styles
Install webpack dependencies
npm install
Create your customized scripts and styles
mv resources/scripts/example.custom.js resources/scripts/custom.js mv resources/styles/example.custom.scss resources/styles/custom.scss
Create customized files
npm run prod
Tell MediaWiki to use the custom files with this line in LocalSettings.php
$wgTweekiSkinUseCustomFiles = true;