stylusはなぜ~@import'~common/styls/mixin'に参加するのか

stylusのapiをよく見ました:https://github.com/shama/stylus-loader
and then  require('./file.styl');  will compile and add the CSS to your page. stylus-loader  can also take advantage of webpack's resolve options. With the default options it'll find files in  web_modules as well as  node_modules , make sure to prefix any lookup in node_modules with  ~ . For example if you have a styles package lookup files in it like  @import '~styles/my-styles . It can also find stylus files without having the extension specified in the  @import  and index files in folders if webpack is configured for stylus's file extension.

module: {
  resolve: {
    extensions: ['', '.js', '.styl']
  }
}

will let you have an  index.styl  file in your styles package and  require('styles')  or  @import '~styles'  it. It also lets you load a stylus file from a package installed in node_modules or if you add a modulesDirectories, like  modulesDirectories: ['node_modules', 'web_modules', 'bower_components']  option you could load from a folder like bower_components. To load files from a relative path leave off the  ~  and  @import 'relative-styles/my-styles';  it.
Be careful though not to use the extensions configuration for two types of in one folder. If a folder has a  index.js  and a  index.styl  and you  @import './that-folder' , it'll end up importing a javascript file into your stylus.
みんなが理解したと信じています!