Support one field required out of many validation

Is your feature request related to a problem? Please describe. At the moment there is only validation for specific fields. It would be amazing if somehow you could add validation based off other inputs.

For example:

Email Phone

Only one of them is required. If you fill in Email then Phone is not required.

Describe the solution you’d like

Right now validation is added part of register. Possibly add an extra field like mode to the useForm hook and call it validation.

Describe alternatives you’ve considered

I think something similar is possible using getValues and comparing them. But this would be a great addition to the great library react-hook-form is.

[bluebill1049]

I will ping on the board for a couple of weeks anyhow, see if other users have a similar request.

[Semigradsky]

you will need to user trigger for dependent inputs

Thanks a lot!