const Joi = require('joi');

​

const schema = Joi.object({

    username: Joi.string()

        .alphanum()

        .min(3)

        .max(30)

        .required(),

​

    password: Joi.string()

        .pattern(new RegExp('^[a-zA-Z0-9]{3,30}$')),

​

    repeat_password: Joi.ref('password'),

​

    access_token: [

        Joi.string(),

        Joi.number()

    ],

​

    birth_year: Joi.number()

        .integer()

        .min(1900)

        .max(2013),

​

    email: Joi.string()

        .email({ minDomainSegments: 2, tlds: { allow: ['com', 'net'] } })

})

    .with('username', 'birth_year')

    .xor('password', 'access_token')

    .with('password', 'repeat_password');

​

​

schema.validate({ username: 'abc', birth_year: 1994 });

// -> { value: { username: 'abc', birth_year: 1994 } }

​

schema.validate({});

// -> { value: {}, error: '"username" is required' }

​

// Also -

​

try {

    const value = await schema.validateAsync({ username: 'abc', birth_year: 1994 });

}

catch (err) { }