verificator/es/rules/required.js

Client and server-side validation JavaScript library

const validate = (attribute, value, parameters, validator) => {
    if (value == null) {
        return false;
    }
    else if (typeof value === 'string' && value.trim() === '') {
        return false;
    }
    else if (Array.isArray(value) && value.length < 1) {
        return false;
    }
    return true;
};
export default validate;