fairnesscoop / permacoop

import { buildMessage, isEmail, ValidateBy } from 'class-validator';

// Don't validate if '' is received.

// See: https://github.com/typestack/class-validator/issues/232

export function IsEmailOrEmpty(): any {

  return ValidateBy({

    name: 'isEmailOrEmpty',

    validator: {

      validate: value => {

        return value === '' || isEmail(value);

      },

      defaultMessage: buildMessage(

        eachPrefix => eachPrefix + '$property must be an email'

      )

    }

  });

}