How to access contexts in fromPromise() v5 handler?

[old plover]

In v4 I could simply use an async function as a service, and got the context as a parameter.
No in v5 there is fromPromise but it doesn't receive the context as parameter. How do I access the state of my machine in fromPromise?

[neon idol]

Correct, this is because actors (and other implementation sources) should ideally not be dependent on their parent machine state. Instead, you pass in the relevant data via input:

invoke: {
  src: fromPromise(async ({ input }) => {
    console.log(input.msg); // 'hello'
    // ...
  }),
  input: ({ context, event }) => ({
    msg: context.message
  })
}

[old plover]

Ah that makes a lot of sense thanks! For some reason the argument provided to the input callback is of type any. Is this not properly typed yet, or do we have an issue with our configuration?

Also: I can edit this in code, but next time I'll export my state machine, I will lose this input configuration again. Can I configure my input in Stately Studio as well? Or is there a separate location where I can configure the input?

[neon idol]

We are still working on input/output and general V5 support in Stately Studio; pardon our dust

As far as typing, there is a way to strongly type actor input, but it is a bit boilerplatey right now. We're working on a setup() function that will make this a lot easier. But for now, this is how you'd do it: https://stately.ai/docs/actors#typescript

[calm palm]

hey @old plover . hope you got the help you needed from David here.
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