code: function getResult(attrNode, dataSourceName, context) {
      const resultId = attrNode.dataSources[dataSourceName].resultId;
      if (typeof resultId === 'undefined') {
          const attrPath = context.attrPath.length > 0 ? context.attrPath.join('.') : '{root}';
          throw new ImplementationError(`Result for "${attrPath}" (DataSource "${dataSourceName}") missing`);
      }
      return context.rawResults[resultId];
  }
docs: Get raw result for given DataSource for current (sub-)resource.
  
  @private