code: function(projectConfig, featureKey, logger) {
      if (projectConfig.featureKeyMap.hasOwnProperty(featureKey)) {
        var feature = projectConfig.featureKeyMap[featureKey];
        if (!!feature) {
          return feature;
        }
      }
  
      logger.log(LOG_LEVEL.ERROR, sprintf(ERROR_MESSAGES.FEATURE_NOT_IN_DATAFILE, MODULE_NAME, featureKey));
      return null;
    }
docs: Get feature from provided feature key. Log an error if no feature exists in
  the project config with the given key.
  @param {Object} projectConfig
  @param {string} featureKey
  @param {Object} logger
  @return {Object|null} Feature object, or null if no feature with the given
  key exists