module Kernel
  def to_json: (*untyped) -> String
end

module Gem
  class Specification
    attr_reader version (): Version

    attr_reader gem_dir (): String

    def self.find_by_name: (String name, ?String? version) -> instance
  end
end

class OptionParser
  def initialize: () ?{ (instance) -> void } -> void
                
  def on: (*String) { (String) -> void } -> void
        
  attr_accessor version: String
  
  attr_accessor banner: String

  def order!: (Array[String]) -> void
            
  def parse!: (Array[String]) -> void
            
  def ver: () -> String
         
  def help: () -> String
end