React-hook-form: How to run some code after handleSubmit executed?

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Describe the question?
I'd like to show a toast with error message after handleSubmit executed. But I don't know how to "handle this event". Maybe we could have two callbacks arguments like handleSubmit(resolved, rejected) ?

To Reproduce
No need to reproduce.

Codesandbox link
Take this from Examples - Register Error Messages as an example.
https://codesandbox.io/s/o766kp4z05

Screenshots
No screenshots.

Additional context

114 looks similar.

[bluebill1049]

const onSubmit = () => {
  // do your logic here
}

useEffect(() => {
  // do your logic here
}, [errors])

handleSubmit(onSubmit)