I find myself struggling trying to use a specific minified CSS file under node_modules for Milligram in Phoenix Framework using Webpack. First I thought that I need to define a resolve entry in my webpack.config.js as described in css-loader docs.

Then, I've discovered that I can simply use this Webpack notation in my manifest file (app.scss):

@import '~milligram/dist/milligram.min';

As described in docs:

To import assets from a node_modules path (include resolve.modules) and for alias, prefix it with a ~

Note that if you have other Webpack loaders, it will expand your CSS file in development mode.