module Base64
  def self.decode64: (String str) -> String
  def self.encode64: (String bin) -> String
  def self.strict_decode64: (String str) -> String
  def self.strict_encode64: (String bin) -> String
  def self.urlsafe_decode64: (String str) -> String
  def self.urlsafe_encode64: (String bin) -> String

  def decode64: (String str) -> String
  def encode64: (String bin) -> String
  def strict_decode64: (String str) -> String
  def strict_encode64: (String bin) -> String
  def urlsafe_decode64: (String str) -> String
  def urlsafe_encode64: (String bin, ?padding: bool) -> String
end