Wrapper components

WrapperComponent.fusion

prototype(Vendor.Site:Example) < prototype(Neos.Fusion:Component) {
  foo = null
  bar = null

  renderer = Neos.Fusion:Component {
    # pass all outer props to the renderer
    @apply.props = ${props}

    # alternatively pass explicit props to the renderer  
    foo = ${props.foo}

    # calculate additional props based on outer props
    barTransformed = Neos.Fusion:Map {
      items = ${props.bar}
      itemRenderer = ...
    }
    
    renderer = afx`...`
  }
}

Just for the record, an alternative syntax using @context:

prototype(Vendor.Site:Example) < prototype(Neos.Fusion:Component) {
  foo = null
  bar = null
  renderer.@context {
    foo = ${props.foo}
    barTransformed = Neos.Fusion:Map {
      items = ${props.bar}
      itemRenderer = ...
    }
  }
  renderer = afx`...`
}

That is not exactly equivalent as @context is available in the whole chain below while props are evaluated fresh for each component.
In usual cases it may look equivalent but has some important deviations.

OK, good call. I like the brevity of it, but it's not the same you're right

FYI: in the meantime private props can be used to achieve the same without the drawbacks mentioned above

Totally agree @private is nowadays the way to go