Differences between importing "devextreme-vue/*" and "devextreme-vue/ui/*"

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Support Question

Hi,

I'm having trouble understanding the difference between importing the components from "devextreme-vue/" and "devextreme-vue/ui/". Some examples on js.devexpress.com uses the /* (like here), and other the /ui/* (like here).

There is no clear difference between the two in term of bundle size or behaviour. Is it a Typescript support feature, or something else ?

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I just saw this line in the compiled bundle under ui/accordion.js :

It is not trowing warnings or errors, so I wasn't able to spot it until now. I suppose this is old code ?