CODEWITHSUNDEEP
javascriptxstate
xvaldetaro
xvaldetaro

Reputation: 189

Global Transition to a "catch-all-do-cleanup-exit-nicely" state

I have a catch all error state that does some cleanup for my application and exits nicely.

currently I have to create a specific event {type: "unexpected_error"} and add a transition to every single state of my machine to achieve that.

Is there a simpler way that I can specify a transition for all states so I don't have to add this transition to every single state?

Upvotes: 2

Views: 279

Answers (1)

David Khourshid
David Khourshid

Reputation: 5203

Yes! You can place transitions on the top-level machine.

const machine = Machine({
  // ...
  states: { /*...*/ },
  // top-level transition
  on: {
    "unexpected-error": { actions: /*...*/ }
  }
});

Alternatively, since it's just a JavaScript object, so you can make a helper function:

function transitionsWithErrorHandler(transitions) {
  return {
    ...transitions,
    "unexpected-error": { actions: /*...*/ }
  }
}

// ...
states: {
  foo: {
    on: transitionsWithErrorHandler({
      EVENT: 'bar',
      ANOTHER_EVENT: 'baz'
    })
  }
}

Upvotes: 4

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