How to use the apollo-engine-reporting-protobuf.Trace.QueryPlanNode function in apollo-engine-reporting-protobuf

async function executeNode(
  context: ExecutionContext,
  node: PlanNode,
  results: ResultMap | ResultMap[],
  path: ResponsePath,
  captureTraces: boolean,
): Promise {
  if (!results) {
    // XXX I don't understand `results` threading well enough to understand when this happens
    //     and if this corresponds to a real query plan node that should be reported or not.
    //
    // This may be if running something like `query { fooOrNullFromServiceA {
    // somethingFromServiceB } }` and the first field is null, then we don't bother to run the
    // inner field at all.
    return new Trace.QueryPlanNode();
  }

  switch (node.kind) {
    case 'Sequence': {
      const traceNode = new Trace.QueryPlanNode.SequenceNode();
      for (const childNode of node.nodes) {
        const childTraceNode = await executeNode(
          context,
          childNode,
          results,
          path,
          captureTraces,
        );
        traceNode.nodes.push(childTraceNode!);
      }
      return new Trace.QueryPlanNode({ sequence: traceNode });

const traceNode = new Trace.QueryPlanNode.FetchNode({
        serviceName: node.serviceName,
        // executeFetch will fill in the other fields if desired.
      });
      try {
        await executeFetch(
          context,
          node,
          results,
          path,
          captureTraces ? traceNode : null,
        );
      } catch (error) {
        context.errors.push(error);
      }
      return new Trace.QueryPlanNode({ fetch: traceNode });
    }
  }
}