upgrade Show component - added prop checkObjectValues

[madaxen86]

First of all - this PR is open for discussion

Before adding changes, documentation, etc. I just wanted to get some feedback if this has a chance to be merged.

-- no breaking change --

Show will just behave as before when checkObjectValues is not set / true.
Motivation: e.g.From Discord

Setting it to true will allow narrow the type of all values to NonNullable.
Imagine this case where you have a signal and store that relies in user input without initial values and you need to pass them to a child component which has strict non-null types.
With current Show typescript will complain that first and last might be undefined. So you either have to use the bang operator or use createMemo to narrow like

const narrow = createMemo(()=> {
  if (selected() && store.data?.first && store.data?.second) return {selected:selected(),first:store.data?.first, second:store.data?.second}
  return false
}

And pass it to Show which now correctly narrows to non-null types.

With the added prop you can just:

const [selected,setSelected] = createSignal<Date|null>(null);
const [store,setStore] = createStore<{data?:{first?:Date,last?:Date}}>({})

return <Show when={{selected:selected(),first:store.data?.first, second:store.data?.second}} checkObjectValues>
// children will only render if all values are truthy 
// item is now narrowed to {selected:Date, first:Date,second:Date}
   {item => <StrictChild {...item} />}
</Show>

Summary

How did you test this change?

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[madaxen86]

@davedbase you're also quite active on discord. What are your thoughts on this?

[davedbase]

@davedbase you're also quite active on discord. What are your thoughts on this?

That would be quite handy tbh.