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checkout.js

    $('[data-duplicate-check]').on('keyup change', '.email input', _.debounce(function () {
        if($email.val().length < 3) {
            return;
        }
        $.ajax({
            url: '/web/api/checkout/duplicate/email',
            data: {id: $('.email').attr('data-id'), email: $email.val()}
        }).done(function (data) {
            $email.parent().find('.alert-box').remove();
            if (!$.isEmptyObject(data)) {
                $email.after($('<p class="alert-box warning">').text(data.error));
            } else {
                $email.parent().find('.alert-box').remove();
            }
        });
    }, 400));