statelyai/xstate @xstate/svelte@3.0.4

on GitHub

Patch Changes

• #5055 ad38c35c37 Thanks @SandroMaglione! - Updated types of useActor, useMachine, and useActorRef to require input when defined inside types/input.

  Previously even when input was defined inside types, useActor, useMachine, and useActorRef would not make the input required:

  const machine = setup({
    types: {
      input: {} as { value: number }
    }
  }).createMachine({});
  
  function App() {
    // Event if `input` is not defined, `useMachine` works at compile time, but risks crashing at runtime
    const _ = useMachine(machine);
    return <></>;
  }

  With this change the above code will show a type error, since input is now required:

  const machine = setup({
    types: {
      input: {} as { value: number }
    }
  }).createMachine({});
  
  function App() {
    const _ = useMachine(machine, {
      input: { value: 1 } // Now input is required at compile time!
    });
    return <></>;
  }

  This avoids runtime errors when forgetting to pass input when defined inside types.