class Logger
  class LogDevice
    include MonitorMixin

    include Period

    attr_reader dev: _WriteCloser
    attr_reader filename: String?

    public

    def close: () -> nil

    def reopen: (?logdev log) -> self

    def write: (untyped message) -> untyped

    private

    def add_log_header: (IO file) -> untyped

    def check_shift_log: () -> untyped

    def create_logfile: (String filename) -> File

    def initialize: (?untyped logdev, ?binmode: boolish, ?shift_period_suffix: String, ?shift_size: Integer, ?shift_age: Numeric | String) -> void

    def lock_shift_log: () { () -> untyped } -> untyped

    def open_logfile: (String filename) -> File

    def set_dev: (logdev log) -> untyped

    def shift_log_age: () -> true

    def shift_log_period: (Time period_end) -> true
  end
end