old_contents: 'use strict';
  
  var _ = require('lodash');
  var util = require('util');
  
  var validateDeprecation = function(value, expectation, options) {
    if (!options.deprecated) {
      return;
    }
  
    var valid = (value instanceof options.deprecated || typeof(value) === typeof(options.deprecated.call()));
  
    if (valid) {
      var message = util.format('%s should not be of type "%s"', util.inspect(value), options.deprecated.name);
  
      console.log('DEPRECATION WARNING:', options.deprecationWarning || message);
    }
  
    return valid;
  };
  
  var validate = function(value, expectation, options) {
  
    // the second part of this check is a workaround to deal with an issue that occurs in node-webkit when
    // using object literals.  https://github.com/sequelize/sequelize/issues/2685
    if (value instanceof expectation || typeof(value) === typeof(expectation.call())) {
      return true;
    }
  
    throw new Error(util.format('The parameter (value: %s) is no %s.', value, expectation.name));
  };
  
  var ParameterValidator = module.exports = {
    check: function(value, expectation, options) {
      options = _.extend({
        deprecated: false,
        index: null,
        method: null,
        optional: false
      }, options || {});
  
      if (!value && options.optional) {
        return true;
      }
  
      if (value === undefined) {
        throw new Error('No value has been passed.');
      }
  
      if (expectation === undefined) {
        throw new Error('No expectation has been passed.');
      }
  
      return false
        || validateDeprecation(value, expectation, options)
        || validate(value, expectation, options);
    }
  };
  
  
new_contents: 'use strict';
  
  var _ = require('lodash');
  var util = require('util');
  
  var validateDeprecation = function(value, expectation, options) {
    if (!options.deprecated) {
      return;
    }
  
    var valid = value instanceof options.deprecated;
  
    if (valid) {
      var message = util.format('%s should not be of type "%s"', util.inspect(value), options.deprecated.name);
  
      console.log('DEPRECATION WARNING:', options.deprecationWarning || message);
    }
  
    return valid;
  };
  
  var validate = function(value, expectation, options) {
    if (value instanceof expectation) {
      return true;
    }
  
    throw new Error(util.format('The parameter (value: %s) is no %s.', value, expectation.name));
  };
  
  var ParameterValidator = module.exports = {
    check: function(value, expectation, options) {
      options = _.extend({
        deprecated: false,
        index: null,
        method: null,
        optional: false
      }, options || {});
  
      if (!value && options.optional) {
        return true;
      }
  
      if (value === undefined) {
        throw new Error('No value has been passed.');
      }
  
      if (expectation === undefined) {
        throw new Error('No expectation has been passed.');
      }
  
      return false
        || validateDeprecation(value, expectation, options)
        || validate(value, expectation, options);
    }
  };
  
subject: Revert "Workaround to deal with an issue in node-webkit where the validate function fails on object literals"