How to conditionally disable the submit button with react-hook-form?

Couldn't find a solution.
I'm using react-hook-form and I want to disable the submit button when the forms are empty and enable as long as all forms have atleast something written in them.
How would I do that using react-hook-form?

const { 
    register, 
    handleSubmit, 
    formState: { isSubmitting, isDirty, isValid } // here
  } = useForm({ mode: "onChange" })


<button
  type="submit"
  disabled={!isDirty || !isValid} // here
>
  Comment
</button>