Combine store state with props to create prop for view

[Sova]

const B = reflect({
  view: A,
  bind: {
    foo: $data,
  },
  mapProps: {
    bar: { source: $data, fn: (data, props) => data[props.key] }
  },
})

[Ilya Azin]

Still actual!)

[Igor Kamyşev]

Sounds kinda Sourced fields from Farfetched 🤔

[Igor Kamyşev]

So, I'm going to stick with the following API:

const B = reflect({
  view: A,
  bind: {
    foo: $data,
    bar: { source: $data, fn: (data, props) => data[props.key] }
  },
})

PR will be done in a week 🤗