visitFieldNode method

@override FieldNode visitFieldNode(FieldNode node)

Visit FieldNode.

Implementation

@override
FieldNode visitFieldNode(FieldNode node) {
  if (node.selectionSet == null) {
    return node;
  }

  final hasTypename = node.selectionSet!.selections
      .whereType<FieldNode>()
      .any((node) => node.name.value == '__typename');

  if (hasTypename) return node;

  return FieldNode(
    name: node.name,
    alias: node.alias,
    arguments: node.arguments,
    directives: node.directives,
    selectionSet: SelectionSetNode(
      selections: <SelectionNode>[
        FieldNode(
          name: NameNode(value: '__typename'),
        ),
        ...node.selectionSet!.selections,
      ],
    ),
  );
}