Questions about SlotProps.slot in Slots.tsx implementation

[bstro]

Hi there! I'm trying to understand exactly how Slots.tsx works. In particular, I'm wondering about useSlotProps:

interface SlotProps {
  slot?: string
}

export function useSlotProps<T>(props: T & {id?: string}, defaultSlot?: string): T {
  let slot = (props as SlotProps).slot || defaultSlot;
  let {[slot]: slotProps = {}} = useContext(SlotContext) || {};

  return mergeProps(props, mergeProps(slotProps, {id: props.id}));
}

What is SlotProps.slot intended for? Is it so that I could declare the child's slot from the parent?

In all the invocations of useSlotProps that I've seen so far in the Spectrum codebase, they all seem to specify a defaultProp. All except one: View.tsx's invocation of useSlotProps has no second parameter for defaultSlot. I am wondering why this is the case.

Thank you!

[LFDanLu]

What is SlotProps.slot intended for? Is it so that I could declare the child's slot from the parent?

Yes that is correct, here is an example of this. As you can see in this story, there are two Text elements, one without a slot prop defined (and thus has the default "text" slot) and one with slot="description". This allows us to send the proper classNames/props to each so that one renders as the main ListBox's option's text and the other as the option's description:

View doesn't have a default slot since it is a more generic container rather than a commonly used component that is slotted within one of our components.

[bstro]

this makes sense! thank you!