TypeError: ".flexslider is not a function" only if I import flexslider as node module using webpack

[sabat24]

I faced with a weird error. If I import flexslider as a node module like that import 'flexslider'; or import 'flexslider/jquery.flexslider'; I get an error as stated above.

However if I move that file outside node_modules directory and import it like that import '../front/js/flexslider/js/jquery.flexslider'; everything works fine.

What's more I have no problem with other jQuery plugins imported from node_modules directory.

Is it possible that flexslider registers itself somehow to another jQuery instance, which then isn't available outside? Even if why does it work correctly if I just move that file to another directory? Could some settings from .json config files cause that issue?