module GraphQL::Client::DocumentTypes

def self.analyze_types(schema, document)

Returns a Hash[Language::Nodes::Node] to GraphQL::Type objects.

document - A GraphQL::Language::Nodes::Document to scan
schema - A GraphQL::Schema

Internal: Detect all types used in a given document 
def self.analyze_types(schema, document)
  unless schema.is_a?(GraphQL::Schema) || (schema.is_a?(Class) && schema < GraphQL::Schema)
    raise TypeError, "expected schema to be a GraphQL::Schema, but was #{schema.class}"
  end
  unless document.is_a?(GraphQL::Language::Nodes::Document)
    raise TypeError, "expected schema to be a GraphQL::Language::Nodes::Document, but was #{document.class}"
  end
  visitor = AnalyzeTypesVisitor.new(document, schema: schema)
  visitor.visit
  visitor.fields
rescue StandardError => err
  if err.is_a?(TypeError)
    raise
  end
  # FIXME: TypeStack my crash on invalid documents
  visitor.fields
end