liveValidator()

nebula.liveValidator = function(){
    //CF7 Invalid events
    nebula.dom.document.on('wpcf7invalid', function(e){
        setTimeout(function(){ //This triggers before these classes are added by CF7 so wait for 1ms
            jQuery('#' + e.detail.unitTag).find('.wpcf7-not-valid').each(function(){ //Find invalid fields only within this CF7 form
                nebula.applyValidationClasses(jQuery(this), 'invalid', true);
            });
        }, 1);
    });

    //Standard text inputs and select menus
    nebula.dom.document.on('keyup change blur', '.nebula-validate-text, .nebula-validate-textarea, .nebula-validate-select', function(e){
        if ( e.type === 'focusout' ){
            jQuery(this).val(jQuery(this).val().trim()); //Trim leading/trailing whitespace on blur
        }

        if ( jQuery(this).val() === '' ){
            nebula.applyValidationClasses(jQuery(this), 'reset', false);
        } else if ( jQuery(this).val().trim().length ){
            nebula.applyValidationClasses(jQuery(this), 'valid', false);
        } else {
            nebula.applyValidationClasses(jQuery(this), 'invalid', ( e.type !== 'keyup' ));
        }
    });

    //RegEx input
    nebula.dom.document.on('keyup change blur', '.nebula-validate-regex', function(e){
        if ( e.type === 'focusout' ){
            jQuery(this).val(jQuery(this).val().trim()); //Trim leading/trailing whitespace on blur
        }

        let pattern = new RegExp(jQuery(this).attr('data-valid-regex'), 'i');

        if ( jQuery(this).val() === '' ){
            nebula.applyValidationClasses(jQuery(this), 'reset', false);
        } else if ( pattern.test(jQuery(this).val()) ){
            nebula.applyValidationClasses(jQuery(this), 'valid', false);
        } else {
            nebula.applyValidationClasses(jQuery(this), 'invalid', ( e.type !== 'keyup' ));
        }
    });

    //URL inputs
    nebula.dom.document.on('keyup change blur', '.nebula-validate-url', function(e){
        if ( e.type === 'focusout' ){
            jQuery(this).val(jQuery(this).val().trim()); //Trim leading/trailing whitespace on blur
        }

        if ( jQuery(this).val() === '' ){
            nebula.applyValidationClasses(jQuery(this), 'reset', false);
        } else if ( nebula.regex.url.test(jQuery(this).val()) ){
            nebula.applyValidationClasses(jQuery(this), 'valid', false);
        } else {
            nebula.applyValidationClasses(jQuery(this), 'invalid', ( e.type !== 'keyup' ));
        }
    });

    //Email address inputs
    nebula.dom.document.on('keyup change blur', '.nebula-validate-email', function(e){
        if ( e.type === 'focusout' ){
            jQuery(this).val(jQuery(this).val().trim()); //Trim leading/trailing whitespace on blur
        }

        if ( jQuery(this).val() === '' ){
            nebula.applyValidationClasses(jQuery(this), 'reset', false);
        } else if ( nebula.regex.email.test(jQuery(this).val()) ){
            nebula.applyValidationClasses(jQuery(this), 'valid', false);
        } else {
            nebula.applyValidationClasses(jQuery(this), 'invalid', ( e.type !== 'keyup' ));
        }
    });

    //Phone number inputs
    nebula.dom.document.on('keyup change blur', '.nebula-validate-phone', function(e){
        if ( e.type === 'focusout' ){
            jQuery(this).val(jQuery(this).val().trim()); //Trim leading/trailing whitespace on blur
        }

        if ( jQuery(this).val() === '' ){
            nebula.applyValidationClasses(jQuery(this), 'reset', false);
        } else if ( nebula.regex.phone.test(jQuery(this).val()) ){
            nebula.applyValidationClasses(jQuery(this), 'valid', false);
        } else {
            nebula.applyValidationClasses(jQuery(this), 'invalid', ( e.type !== 'keyup' ));
        }
    });

    //Date inputs
    nebula.dom.document.on('keyup change blur', '.nebula-validate-date', function(e){
        if ( e.type === 'focusout' ){
            jQuery(this).val(jQuery(this).val().trim()); //Trim leading/trailing whitespace on blur
        }

        //Used to use day.js to validate the date and check that it was between 1800-2999. Now just check that it is not empty.

        if ( jQuery(this).val() === '' ){
            nebula.applyValidationClasses(jQuery(this), 'reset', false);
        } else {
            nebula.applyValidationClasses(jQuery(this), 'valid', ( e.type !== 'keyup' )); //This indicates it is valid as long as it isn't empty
        }
    });

    //Checkbox and Radio
    //Note: The CF7 "Privacy Acceptance" checkbox does not accept custom classes, so we must use its ID directly here
    nebula.dom.document.on('change blur', '#cf7-privacy-acceptance, .nebula-validate-checkbox, .nebula-validate-radio', function(e){
        if ( jQuery(this).closest('.form-group, .form-check').find('input:checked').length ){
            nebula.applyValidationClasses(jQuery(this), 'reset', false);
        } else {
            nebula.applyValidationClasses(jQuery(this), 'invalid', true);
        }
    });

    //Highlight empty required fields when focusing/hovering on submit button
    nebula.dom.document.on('mouseover focus', 'form [type="submit"], form #submit', function(){ //Must be deferred because Nebula replaces CF7 submit inputs with buttons
        let invalidCount = 0;

        //This is a non-essential, cosmetic helper, so escape if any errors occur
        try {
            jQuery(this).closest('form').find('[required], .wpcf7-validates-as-required').each(function(){
                //Look for checked checkboxes or radio buttons
                if ( jQuery(this).find('input:checked').length ){
                    return; //Continue
                }

                //Look for empty fields
                if ( jQuery(this).val().trim().length === 0 ){ //Sometimes jQuery(this) is null and errors on .trim(), so wrapped the whole thing in a try
                    jQuery(this).addClass('nebula-empty-required');
                    invalidCount++;
                }
            });
        } catch {
            //Ignore
        }

        if ( invalidCount > 0 ){
            let invalidCountText = ( invalidCount === 1 )? ' invalid field remains' : ' invalid fields remain';
            jQuery('form [type="submit"], form #submit').attr('title', invalidCount + invalidCountText);
        }
    });

    nebula.dom.document.on('mouseout blur', 'form [type="submit"], form #submit', function(){ //Must be deferred because Nebula replaces CF7 submit inputs with buttons
        jQuery(this).closest('form').find('.nebula-empty-required').removeClass('nebula-empty-required');
        jQuery('form [type="submit"], form #submit').removeAttr('title');
    });
};

For non-module import functions:

nebula.liveValidator = function(){
    //Write your own code here, leave it blank, or return false.
}

For dynamically imported module function overrides:

jQuery(window).on('load', function(){
    nebula.liveValidator = function(){
        //Write your own code here, leave it blank, or return false.
    }
});

Custom Nebula DOM events do also exist, so you could also try the following if the Window Load listener does not work:

jQuery(document).on('nebula_module_loaded', function(module){
    //Note that the module variable is also available to know which module specifically was imported
    if ( typeof nebula.liveValidator === 'function' ){
        nebula.liveValidator = function(){
            //Write your own code here, leave it blank, or return false.
        }
	}
});