conn.stream.on('end', () => {
    const result: ExecuteFluxQueryResult = {
      csv,
      didTruncate,
      rowCount,
    }

    deferred.resolve(result)
  })

  const resolve = () => {
    let csv = xhr.responseText

    if (didTruncate) {
      // Discard the last line in the response since it may be partially read
      csv = csv.slice(0, csv.lastIndexOf('\n'))
    }

    rowCount += countNewRows()

    const result: ExecuteFluxQueryResult = {
      csv,
      didTruncate,
      rowCount,
    }

    deferred.resolve(result)
    clearTimeout(interval)
  }

  const checkResult = async (
    promise: Promise<V>,
    deferred: Deferred,
    promiseID: number
  ) => {
    let result
    let isOk = true

    try {
      result = await promise
    } catch (error) {
      result = error
      isOk = false
    }

    if (promiseID !== id) {
      deferred.reject(new CancellationError())
    } else if (!isOk) {
      deferred.reject(result)
    } else {
      deferred.resolve(result)
    }
  }

 Promise.all(findLeaves(graph).map(resolve)).then(() => {
   deferred.resolve(extractResult(graph))
 })