Is there a best practice of publish the component library?

[composite]

I made a small svelte component library and I wondered which is best use my component for consumer, such as:

• just publish .svelte file and import it.
• build with packaging module like rollup and publish.
  But I chose that just publish .svelte file and imported it simply.
  I tried build and import in a my sveltekit testing module but it didn't work.

What is best of the publishing component library? is there a example for Svelte and SvelteKit?