PristineJS - Form Validation

document.addEventListener("DOMContentLoaded",function(){
       let form = document.getElementById("myForm");
       let pristine = new Pristine(form);
       form.addEventListener('submit', function (e) {
          let valid = pristine.validate();
          if (valid) {
            return true;
          } else {
            e.preventDefault();
          }
       });
     })