react-final-form
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onSubmit type signature - is callback really optional?
Are you submitting a bug report or a feature request?
bug report
What is the current behavior?
https://final-form.org/docs/react-final-form/types/FormProps#onsubmit
callback?: (errors?: SubmissionErrors) => void,
What is the expected behavior?
callback: (errors?: SubmissionErrors) => void,
I believe callback parameter is passed everytime, it's just matter of function itself if it wants to use it.