📩 Newsletter Signup With Success State

This is my function for validating the email, but I don't have error message for validating an empty input field.

Javascript

subForm.addEventListener("submit", (el) => {
  el.preventDefault();

  if (emailInput.value.match(emailFormat)) {
    defaultCard[0].classList.add("hidden");
    successCard[0].classList.add("visible");
  }
});

This is the html

    <div class="input-wrapper">
          <input
             type="email"
              name="email"
              id="email"
              placeholder="email@company.com"
          />
          <div class="input-error-message">Valid email required</div>
     </div>```

How did you implement an error message when a user tries to submit an empty input field?