File Content: formatter.rbs class Logger class Formatter public attr_accessor datetime_format: String? def call: (String severity, Time time, untyped progname, untyped msg) -> String private def format_datetime: (Time time) -> untyped def initialize: () -> void def msg2str: (String | Exception | untyped msg) -> String end interface _Formatter def call: (String severity, Time time, untyped progname, untyped msg) -> _ToS end end Logger::Formatter::Format: String Submit