class GraphQL::StaticValidation::FragmentsAreUsed

def validate(context)
  context.visitor[GraphQL::Language::Nodes::Document].leave << ->(_n, _p) do
    dependency_map = context.dependencies
    dependency_map.unmet_dependencies.each do |op_defn, spreads|
      spreads.each do |fragment_spread|
        context.errors << message("Fragment #{fragment_spread.name} was used, but not defined", fragment_spread.node, path: fragment_spread.path)
      end
    end
    dependency_map.unused_dependencies.each do |fragment|
      if !fragment.name.nil?
        context.errors << message("Fragment #{fragment.name} was defined, but not used", fragment.node, path: fragment.path)
      end
    end
  end
end