Constant BOARD 

pub const BOARD: &str = r#"query($owner:String!,$number:Int!,$first:Int!,$after:String,$nestedFirst:Int!,$duplicates:Boolean!){
      owner:repositoryOwner(login:$owner){
        ... on ProjectV2Owner{projectV2(number:$number){...Board}}
      }
    } fragment Board on ProjectV2 { id title
      fields(first:$nestedFirst){nodes{
        ... on ProjectV2SingleSelectField{__typename id name options{id name}}
        ... on ProjectV2Field{__typename id name}
      }pageInfo{hasNextPage}}
      items(first:$first,after:$after){nodes{id fieldValues(first:$nestedFirst){nodes{
        ... on ProjectV2ItemFieldSingleSelectValue{name field{
          ... on ProjectV2SingleSelectField{id name options{id name}}
        }}
        ... on ProjectV2ItemFieldTextValue{text field{... on ProjectV2Field{id name}}}
        ... on ProjectV2ItemFieldLabelValue{labels(first:$nestedFirst){nodes{id name color}pageInfo{hasNextPage}}}
      }pageInfo{hasNextPage}} content{
        ... on Issue{__typename id title body url createdAt updatedAt state stateReason(enableDuplicate:$duplicates) repository{nameWithOwner} parent{id} subIssuesSummary{total} labels(first:$nestedFirst){nodes{id name color}pageInfo{hasNextPage}}}
        ... on PullRequest{__typename id}
        ... on DraftIssue{__typename id title body createdAt updatedAt}
      }} pageInfo{hasNextPage endCursor}}
    }"#;

Reads the board’s fields and one page of its items.