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define([], function() {
  /** Used as a safe reference for `undefined` in pre-ES5 environments. */  var undefined;
  /**   * The base implementation of `_.conformsTo` which accepts `props` to check.   *   * @private   * @param {Object} object The object to inspect.   * @param {Object} source The object of property predicates to conform to.   * @returns {boolean} Returns `true` if `object` conforms, else `false`.   */  function baseConformsTo(object, source, props) {    var length = props.length;    if (object == null) {      return !length;    }    object = Object(object);    while (length--) {      var key = props[length],          predicate = source[key],          value = object[key];
      if ((value === undefined && !(key in object)) || !predicate(value)) {        return false;      }    }    return true;  }
  return baseConformsTo;});