query chatChannel(
  $teamId: ID!
  $channelName: String!
  $repoOwner: String!
  $repoName: String!
) {
  ChatTeam(id: $teamId) {
    channels(name: $channelName) @required {
      name
      repos(owner: $repoOwner, name: $repoName) @required {
        name
        owner
      }
    }
  }
}