Through a new reserved interfaceComponentDef

See new tests for examples.

Generics

Problem to be solved: Generics. We cannot useinstanceOf(ComponentName) anymore, because this way we cannot pass in the information about the type of the generic.

If we have

Child:

<scriptlang="ts">interfaceComponentDef<T>{props:{items:T[]},events:{itemClick:CustomEvent<T>;}slots:{}}</script>// ...

Parent:

<Childitems="{['a', 'stringarray']}"on:itemClick="{iShouldBeOfTypeString => ...}"/>

We need a transformation that makes sure thatiShouldBeOfTypeString actually is inferred asstring. My current idea is to transform this tonew Child({props: {...allPropsAndItsValuesThatAreDefinedOnTheChild}}).$on instead of the oldinstanceOf(Child).$on.

A completely different idea is to somehow use Function Components instead of Class components. But I'm not sure if we can use this with all the other constraints we have.

Thoughts?