code: protected function publishes(array $paths, $group = null)
      {
          $this->ensurePublishArrayInitialized($class = static::class);
          static::$publishes[$class] = array_merge(static::$publishes[$class], $paths);
          if ($group) {
              $this->addPublishGroup($group, $paths);
          }
      }
docs: Register paths to be published by the publish command.
  
  @param  array  $paths
  @param  string  $group
  @return void