Is there an equivalent to IOHelper::ensureFolderExists in Craft 3? Migrating Plugins to Craft 3 starts bugging me, seems that really everything changed.
Is there an equivalent to IOHelper::ensureFolderExists in Craft 3?
In Craft 3, the IOHelper class has been replaced by the FileHelper class.

The closest Craft 3 equivalent to IOHelper::ensureFolderExists() is 

FileHelper::createDirectory($path);