“send” parameter type is not narrow inside effects

[cassiozen]

The "send" function argument type should be an union of transition names. It works properly in the send method returned by useStateMachine - but the send method passed to effect currently broadens to "string".

[cassiozen]

State might need to be a function to enable inference at individual state level. Maybe the API could look like this:

useStateMachine()({
  initialState: 'inactive',
  debugMode: true,
  inactive: stateNode({
    on: { TOGGLE: 'active' },
  }),
  active: stateNode({
    on: { TOGGLE: 'inactive' },
    effect() {
      console.log('Just entered the Active state');
    },
  }),
}
});

[cassiozen]

Working TS Sample with type narrowing on both send functions: typescript playground

[cassiozen]

Solved by #11