vite:css warnings on build

[simontol]

When building ckeditor5 with vite I have a lot of warnings:

transforming (3476) ../node_modules/@ckeditor/ckeditor5-image/src/imageinsertviaurl.js[vite:css] Complex selectors in ':is(.ck.ck-splitbutton.ck-splitbutton_flatten:hover > .ck-splitbutton__action:not(.ck-disabled),.ck.ck-splitbutton.ck-splitbutton_flatten.ck-splitbutton_open > .ck-splitbutton__action:not(.ck-disabled),.ck.ck-splitbutton.ck-splitbutton_flatten:hover > .ck-splitbutton__arrow:not(.ck-disabled),.ck.ck-splitbutton.ck-splitbutton_flatten.ck-splitbutton_open > .ck-splitbutton__arrow:not(.ck-disabled),.ck.ck-splitbutton.ck-splitbutton_flatten:hover > .ck-splitbutton__arrow:not(.ck-disabled):not(:hover),.ck.ck-splitbutton.ck-splitbutton_flatten.ck-splitbutton_open > .ck-splitbutton__arrow:not(.ck-disabled):not(:hover))::after' can not be transformed to an equivalent selector without ':is()'.
91 |                    }
92 |  
93 |  :is(.ck.ck-splitbutton.ck-splitbutton_flatten:hover > .ck-splitbutton__action:not(.ck-disabled),.ck.ck-splitbutton.ck-splitbutton_flatten.ck-splitbutton_open > .ck-splitbutton__action:not(.ck-disabled),.ck.ck-splitbutton.ck-splitbutton_flatten:hover > .ck-splitbutton__arrow:not(.ck-disabled),.ck.ck-splitbutton.ck-splitbutton_flatten.ck-splitbutton_open > .ck-splitbutton__arrow:not(.ck-disabled),.ck.ck-splitbutton.ck-splitbutton_flatten:hover > .ck-splitbutton__arrow:not(.ck-disabled):not(:hover),.ck.ck-splitbutton.ck-splitbutton_flatten.ck-splitbutton_open > .ck-splitbutton__arrow:not(.ck-disabled):not(:hover))::after {
   |   ^
94 |                                    display: none;
95 |                            }
[vite:css] Complex selectors in ':is(.ck.ck-splitbutton.ck-splitbutton_flatten:hover > .ck-splitbutton__action:not(.ck-disabled):not(.does-not-exist))::after' can not be transformed to an equivalent selector without ':is()'.
91 |                    }
92 |  
93 |  :is(.ck.ck-splitbutton.ck-splitbutton_flatten:hover > .ck-splitbutton__action:not(.ck-disabled),.ck.ck-splitbutton.ck-splitbutton_flatten.ck-splitbutton_open > .ck-splitbutton__action:not(.ck-disabled),.ck.ck-splitbutton.ck-splitbutton_flatten:hover > .ck-splitbutton__arrow:not(.ck-disabled),.ck.ck-splitbutton.ck-splitbutton_flatten.ck-splitbutton_open > .ck-splitbutton__arrow:not(.ck-disabled),.ck.ck-splitbutton.ck-splitbutton_flatten:hover > .ck-splitbutton__arrow:not(.ck-disabled):not(:hover),.ck.ck-splitbutton.ck-splitbutton_flatten.ck-splitbutton_open > .ck-splitbutton__arrow:not(.ck-disabled):not(:hover))::after {
   |   ^
94 |                                    display: none;
95 |                            }

and so on...

think that the relevant part is:
Complex selectors in ':is(...)::after' can not be transformed to an equivalent selector without ':is()'.

Vitejs 4.4.2
"@vitejs/plugin-react-swc": "^3.3.2"
"@ckeditor/vite-plugin-ckeditor5": "^0.1.3"

Is there anything I can do to get rid of this warnings?
Thanks

[LukaszGudel]

Hi @simontol,
we are unable to reproduce your issue. To investigate this issue further we would need the contents of your package.json and vite.config.js. Also, it would be incredibly helpful if you are able to provide a sample repository/project where this issue can be reproduced.