module GraphQL::StaticValidation::FragmentSpreadsArePossible

def validate_fragment_in_scope(parent_type, child_type, node, context, path)
  if !child_type.kind.fields?
    # It's not a valid fragment type, this error was handled someplace else
    return
  end
  parent_types = context.warden.possible_types(parent_type.unwrap)
  child_types = context.warden.possible_types(child_type.unwrap)
  if child_types.none? { |c| parent_types.include?(c) }
    name = node.respond_to?(:name) ? " #{node.name}" : ""
    add_error(GraphQL::StaticValidation::FragmentSpreadsArePossibleError.new(
      "Fragment#{name} on #{child_type.name} can't be spread inside #{parent_type.name}",
      nodes: node,
      path: path,
      fragment_name: name.empty? ? "unknown" : name,
      type: child_type.name,
      parent: parent_type.name
    ))
  end
end