Normally this was intended Internal only. Field is required if have required constraint without `false` value
function () {

        var requiredRules = [
            // This one comes out of the box with parsley
            'required',

            // These ones were added with this library
            'requiredIf', 'requiredUnless', 'requiredWith', 'requiredWithAll', 'requiredWithout', 'requiredWithoutAll'
        ];

        var requiredRulesFound = [];

        // Loop over the list to check if they're defined on the field.
        requiredRules.forEach(function (rule) {
            if ('undefined' !== typeof this.constraintsByName[rule]) {
                requiredRulesFound.push(rule);
            }
        }, this);

        // If there's not one required rule, return false
        if (requiredRulesFound.length == 0)
            return false;

        // If parsley's on required rule was found
        if (requiredRulesFound.indexOf('required') >= 0) {
            // Check if the flag is set to true
            return false !== this.constraintsByName.required.requirements;
        }

        return true;
    }