Illuminate\Support\ServiceProvider::publishes PHP Method

    protected function publishes(array $paths, $group = null)
    {
        $class = static::class;
        if (!array_key_exists($class, static::$publishes)) {
            static::$publishes[$class] = [];
        }
        static::$publishes[$class] = array_merge(static::$publishes[$class], $paths);
        if ($group) {
            if (!array_key_exists($group, static::$publishGroups)) {
                static::$publishGroups[$group] = [];
            }
            static::$publishGroups[$group] = array_merge(static::$publishGroups[$group], $paths);
        }
    }