%a{annotate:rdoc:skip}
class Object
  # <!--
  #   rdoc-file=ext/psych/lib/psych/core_ext.rb
  #   - to_yaml(options = {})
  # -->
  # Convert an object to YAML.  See Psych.dump for more information on the
  # available `options`.
  #
  def to_yaml: (?indentation: Integer, ?line_width: Integer, ?canonical: bool, ?header: bool) -> String
             | [IO] (IO, ?indentation: Integer, ?line_width: Integer, ?canonical: bool, ?header: bool) -> IO
end