What problem does this feature solve?

Makes it possible to proxy props from one component to another.

What does the proposed API look like?

<ChildComponent v-bind="childProps" >
...
props: {
  ...ChildComponent.props
},
setup(props) {
    const childProps = componentPropsValues(ChildComponent, props)
    
    return { childProps }
}

This already works. Please use the chat or discord if you have questions!

@posva, This already works, true, but there is an issue with types. For some reason, there are not props types in the ComponentOptionsBase type.

I created code sandbox: https://codesandbox.io/s/eloquent-golick-996nz?file=/src/App.vue

If I add any props from the child component, then parent component props will have such type { [key: string]: any }

I made a function that extracts prop types, but it is not working with props without a default value.

I got this issue in the code sandbox and the local environment too.