Recopilation of info about problems with less and relative URLS

[acacha]

Context

I think lots of problems arise (see Issues) using AdminLTE less with webpack, Laravel Mix or maybe other tools because less-loader have problems with relative URLS.

Issues related:

• How to turn off processCssUrls and on again laravel-mix/laravel-mix#1170

So I decided to recopile links related with this problem:

• CSS modules? See https://github.com/css-modules/css-modules:

A CSS Module is a CSS file in which all class names and animation names are scoped locally by default. All URLs (url(...)) and @imports are in module request format (./xxx and ../xxx means relative, xxx and xxx/yyy means in modules folder, i. e. in node_modules).

• https://github.com/css-modules/css-modules
• https://github.com/webpack-contrib/less-loader#css-modules-gotcha
• Unable to resolve module error and reproduction of issue webpack-contrib/less-loader#109 (comment)
• https://github.com/JeffreyWay/laravel-mix/blob/ea9e96d76f6f345eebd2818fdc0fa63b0fc37c65/docs/css-preprocessors.md

[acacha]

Also maybe some use of @url could be avoided with alternatives like PR?:

https://github.com/almasaeed2010/AdminLTE/pull/1526/files