code: function (type, group) {
      if (!config.assets) throw('No assets found in config');
      var t = config.assets[type];
      if (!t) throw('Asset type not found: ' + type);
      var g = t[group];
      if (!g) throw('Asset group not found: ' + group);
  
      if (!_.isArray(g)) g = [g];
      return _.chain(g).map(function (f) {
          return fss.source(f);
      }).map(function (f) {
          if (fs.lstatSync(f).isDirectory()) return fss.allSourceFilePaths(f);
          return f;
      }).flatten().uniq().filter(function (f) {
          var process = fss.isProcessableFile(f);
          var include = !fss.isHelperFile(_.last(f.split('/')));
          return process && include && !assetFileTypeMismatch(type, f);
      }).value();
  }
docs: /*
  Get all asset files by type and group from the config file.