Use the composable useChangeEmail to change email for the user. 
const { changeEmail, isLoading, needsEmailVerification, isError, error } =
  useChangeEmail()

watchEffect(() => {
  console.log(
    isLoading.value,
    needsEmailVerification.value,
    isError.value,
    error.value
  )
})

const handleFormSubmit = async (e) => {
  e.preventDefault()

  await changeEmail('new@example.com')
}

​
Parameters

options optional NestedRefOfValue<undefined | ChangeEmailOptions>