code: function getPlugins (options) {
    var plugins = options.use || options.u;
    if (!plugins) {
      plugins = getDefaultPlugins(options);
    }
    else {
      if (typeof plugins === 'string') {
        plugins = [plugins];
      }
    }
  
    var postcssBefore = options.postcssBefore || options.before || [];
    var postcssAfter = options.postcssAfter || options.after || [];
    plugins = (Array.isArray(postcssBefore) ? postcssBefore : [postcssBefore]).concat(plugins).concat(postcssAfter);
  
    // load plugins by name (if a string is used)
    return plugins.map(function requirePlugin (name) {
      // assume not strings are already required plugins
      if (typeof name !== 'string') {
        return name;
      }
  
      var plugin = module.parent.require(name);
  
      // custom scoped name generation
      if (name === 'postcss-modules-scope') {
        options[name] = options[name] || {};
        if (!options[name].generateScopedName) {
          options[name].generateScopedName = generateLongName;
        }
      }
  
      if (name in options) {
        plugin = plugin(options[name]);
      }
      else {
        plugin = plugin.postcss || plugin();
      }
  
      return plugin;
    });
  }
docs: PostCSS plugins passed to FileSystemLoader