Xstate: Send data to child actor

[CodingDive]

I think this is probably a question not a feature request or bug.

How do we send data to child actors within a machine?

Looking at the example from the docs, we can spawn an actor and send events to it but I'm not sure how to add data to the event.

entry: assign({
  someRef: () => spawn(someMachine)
}),
on: {
  SOME_EVENT: {
    // I want to send some custom data (from either the SOME_EVENT data or the local context) to the PING event 
    actions: send('PING', {
      to: context => context.someRef,
    })
  }
}

With the sendParent API I can do the following:

actions: sendParent(context => ({
  type: 'UPDATE_FROM_CHILD',
  data: context
}))

Does a similar API exist for parent -> child 🤖 communication?

[davidkpiano]

Yes:

actions: send({
  type: 'SOME_EVENT',
  somePayload: 'whatever you want'
}, { to: context => context.someRef })

[davidkpiano]

I'll add this to the docs too.