Component interface best practice

[Burtan]

Hey,
just one short question. Why do you use interfaces for your components, when you just have one implementation?
Thanks :-)

[arkivanov]

Thanks for asking this question! Transferred to Discussions.

It's just a matter of preference, you can avoid interfaces if you don't like them. But there could be more than one implementation for each component.

The TodoApp example features up to three different implementations for a component:

1. Production implementation - TodoMainComponent
2. Fake implementation for integration tests - TodoMainFake
3. Fake implementation for Compose previews - TodoMainPreview

[arkivanov]

But in general, I prefer to extract an interface for every dependency, regardless of the amount of implementations. That's just a rule of thumb for me.

[Burtan]

I didn't think of preview and tests, so that is a good call. Thanks for the fast answer!