class Encoding < Object
  # Returns the hash of available encoding alias and original encoding name.
  #
  #     Encoding.aliases
  #     #=> {"BINARY"=>"ASCII-8BIT", "ASCII"=>"US-ASCII", "ANSI_X3.4-1986"=>"US-ASCII",
  #           "SJIS"=>"Shift_JIS", "eucJP"=>"EUC-JP", "CP932"=>"Windows-31J"}
  def self.aliases: () -> ::Hash[String, String]

  def self.compatible?: (untyped obj1, untyped obj2) -> Encoding?

  # Returns default external encoding.
  #
  # The default external encoding is used by default for strings created
  # from the following locations:
  #
  #   - CSV
  #
  #   - [File](https://ruby-doc.org/core-2.6.3/File.html) data read from
  #     disk
  #
  #   - SDBM
  #
  #   - StringIO
  #
  #   - Zlib::GzipReader
  #
  #   - Zlib::GzipWriter
  #
  #   - [String\#inspect](https://ruby-doc.org/core-2.6.3/String.html#method-i-inspect)
  #
  #   - [Regexp\#inspect](https://ruby-doc.org/core-2.6.3/Regexp.html#method-i-inspect)
  #
  # While strings created from these locations will have this encoding, the
  # encoding may not be valid. Be sure to check
  # [String\#valid\_encoding?](https://ruby-doc.org/core-2.6.3/String.html#method-i-valid_encoding-3F)
  # .
  #
  # [File](https://ruby-doc.org/core-2.6.3/File.html) data written to disk
  # will be transcoded to the default external encoding when written.
  #
  # The default external encoding is initialized by the locale or -E option.
  def self.default_external: () -> Encoding

  def self.default_external=: (String arg0) -> String
                            | (Encoding arg0) -> Encoding

  # Returns default internal encoding. Strings will be transcoded to the
  # default internal encoding in the following places if the default
  # internal encoding is not nil:
  #
  #   - CSV
  #
  #   - Etc.sysconfdir and Etc.systmpdir
  #
  #   - [File](https://ruby-doc.org/core-2.6.3/File.html) data read from
  #     disk
  #
  #   - [File](https://ruby-doc.org/core-2.6.3/File.html) names from
  #     [Dir](https://ruby-doc.org/core-2.6.3/Dir.html)
  #
  #   - [Integer\#chr](https://ruby-doc.org/core-2.6.3/Integer.html#method-i-chr)
  #
  #   - [String\#inspect](https://ruby-doc.org/core-2.6.3/String.html#method-i-inspect)
  #     and
  #     [Regexp\#inspect](https://ruby-doc.org/core-2.6.3/Regexp.html#method-i-inspect)
  #
  #   - Strings returned from Readline
  #
  #   - Strings returned from SDBM
  #
  #   - [Time\#zone](https://ruby-doc.org/core-2.6.3/Time.html#method-i-zone)
  #
  #   - Values from [ENV](https://ruby-doc.org/core-2.6.3/ENV.html)
  #
  #   - Values in ARGV including $PROGRAM\_NAME
  #
  # Additionally
  # [String\#encode](https://ruby-doc.org/core-2.6.3/String.html#method-i-encode)
  # and
  # [String\#encode\!](https://ruby-doc.org/core-2.6.3/String.html#method-i-encode-21)
  # use the default internal encoding if no encoding is given.
  #
  # The locale encoding (\_\_ENCODING\_\_), not
  # [::default\_internal](Encoding.downloaded.ruby_doc#method-c-default_internal)
  # , is used as the encoding of created strings.
  #
  # [::default\_internal](Encoding.downloaded.ruby_doc#method-c-default_internal)
  # is initialized by the source file's internal\_encoding or -E option.
  def self.default_internal: () -> Encoding?

  def self.default_internal=: (String arg0) -> String?
                            | (Encoding arg0) -> Encoding?
                            | (nil arg0) -> nil

  def self.find: (String | Encoding arg0) -> Encoding

  def self.list: () -> ::Array[Encoding]

  # Returns the list of available encoding names.
  #
  #     Encoding.name_list
  #     #=> ["US-ASCII", "ASCII-8BIT", "UTF-8",
  #           "ISO-8859-1", "Shift_JIS", "EUC-JP",
  #           "Windows-31J",
  #           "BINARY", "CP932", "eucJP"]
  def self.name_list: () -> ::Array[String]

  # Returns whether ASCII-compatible or not.
  #
  # ```ruby
  # Encoding::UTF_8.ascii_compatible?     #=> true
  # Encoding::UTF_16BE.ascii_compatible?  #=> false
  # ```
  def ascii_compatible?: () -> bool

  # Returns true for dummy encodings. A dummy encoding is an encoding for
  # which character handling is not properly implemented. It is used for
  # stateful encodings.
  #
  # ```ruby
  # Encoding::ISO_2022_JP.dummy?       #=> true
  # Encoding::UTF_8.dummy?             #=> false
  # ```
  def dummy?: () -> bool

  def inspect: () -> String

  # Returns the name of the encoding.
  #
  # ```ruby
  # Encoding::UTF_8.name      #=> "UTF-8"
  # ```
  def name: () -> String

  # Returns the list of name and aliases of the encoding.
  #
  # ```ruby
  # Encoding::WINDOWS_31J.names  #=> ["Windows-31J", "CP932", "csWindows31J"]
  # ```
  def names: () -> ::Array[String]

  def replicate: (String name) -> Encoding

  # Returns the name of the encoding.
  #
  # ```ruby
  # Encoding::UTF_8.name      #=> "UTF-8"
  # ```
  def to_s: () -> String
end

Encoding::ANSI_X3_4_1968: Encoding

Encoding::ASCII: Encoding

Encoding::ASCII_8BIT: Encoding

Encoding::BIG5: Encoding

Encoding::BIG5_HKSCS: Encoding

Encoding::BIG5_HKSCS_2008: Encoding

Encoding::BIG5_UAO: Encoding

Encoding::BINARY: Encoding

Encoding::Big5: Encoding

Encoding::Big5_HKSCS: Encoding

Encoding::Big5_HKSCS_2008: Encoding

Encoding::Big5_UAO: Encoding

Encoding::CESU_8: Encoding

Encoding::CP1250: Encoding

Encoding::CP1251: Encoding

Encoding::CP1252: Encoding

Encoding::CP1253: Encoding

Encoding::CP1254: Encoding

Encoding::CP1255: Encoding

Encoding::CP1256: Encoding

Encoding::CP1257: Encoding

Encoding::CP1258: Encoding

Encoding::CP437: Encoding

Encoding::CP50220: Encoding

Encoding::CP50221: Encoding

Encoding::CP51932: Encoding

Encoding::CP65000: Encoding

Encoding::CP65001: Encoding

Encoding::CP737: Encoding

Encoding::CP775: Encoding

Encoding::CP850: Encoding

Encoding::CP852: Encoding

Encoding::CP855: Encoding

Encoding::CP857: Encoding

Encoding::CP860: Encoding

Encoding::CP861: Encoding

Encoding::CP862: Encoding

Encoding::CP863: Encoding

Encoding::CP864: Encoding

Encoding::CP865: Encoding

Encoding::CP866: Encoding

Encoding::CP869: Encoding

Encoding::CP874: Encoding

Encoding::CP878: Encoding

Encoding::CP932: Encoding

Encoding::CP936: Encoding

Encoding::CP949: Encoding

Encoding::CP950: Encoding

Encoding::CP951: Encoding

Encoding::CSWINDOWS31J: Encoding

Encoding::CsWindows31J: Encoding

Encoding::EBCDIC_CP_US: Encoding

Encoding::EMACS_MULE: Encoding

Encoding::EUCCN: Encoding

Encoding::EUCJP: Encoding

Encoding::EUCJP_MS: Encoding

Encoding::EUCKR: Encoding

Encoding::EUCTW: Encoding

Encoding::EUC_CN: Encoding

Encoding::EUC_JISX0213: Encoding

Encoding::EUC_JIS_2004: Encoding

Encoding::EUC_JP: Encoding

Encoding::EUC_JP_MS: Encoding

Encoding::EUC_KR: Encoding

Encoding::EUC_TW: Encoding

Encoding::Emacs_Mule: Encoding

Encoding::EucCN: Encoding

Encoding::EucJP: Encoding

Encoding::EucJP_ms: Encoding

Encoding::EucKR: Encoding

Encoding::EucTW: Encoding

Encoding::GB12345: Encoding

Encoding::GB18030: Encoding

Encoding::GB1988: Encoding

Encoding::GB2312: Encoding

Encoding::GBK: Encoding

Encoding::IBM037: Encoding

Encoding::IBM437: Encoding

Encoding::IBM737: Encoding

Encoding::IBM775: Encoding

Encoding::IBM850: Encoding

Encoding::IBM852: Encoding

Encoding::IBM855: Encoding

Encoding::IBM857: Encoding

Encoding::IBM860: Encoding

Encoding::IBM861: Encoding

Encoding::IBM862: Encoding

Encoding::IBM863: Encoding

Encoding::IBM864: Encoding

Encoding::IBM865: Encoding

Encoding::IBM866: Encoding

Encoding::IBM869: Encoding

Encoding::ISO2022_JP: Encoding

Encoding::ISO2022_JP2: Encoding

Encoding::ISO8859_1: Encoding

Encoding::ISO8859_10: Encoding

Encoding::ISO8859_11: Encoding

Encoding::ISO8859_13: Encoding

Encoding::ISO8859_14: Encoding

Encoding::ISO8859_15: Encoding

Encoding::ISO8859_16: Encoding

Encoding::ISO8859_2: Encoding

Encoding::ISO8859_3: Encoding

Encoding::ISO8859_4: Encoding

Encoding::ISO8859_5: Encoding

Encoding::ISO8859_6: Encoding

Encoding::ISO8859_7: Encoding

Encoding::ISO8859_8: Encoding

Encoding::ISO8859_9: Encoding

Encoding::ISO_2022_JP: Encoding

Encoding::ISO_2022_JP_2: Encoding

Encoding::ISO_2022_JP_KDDI: Encoding

Encoding::ISO_8859_1: Encoding

Encoding::ISO_8859_10: Encoding

Encoding::ISO_8859_11: Encoding

Encoding::ISO_8859_13: Encoding

Encoding::ISO_8859_14: Encoding

Encoding::ISO_8859_15: Encoding

Encoding::ISO_8859_16: Encoding

Encoding::ISO_8859_2: Encoding

Encoding::ISO_8859_3: Encoding

Encoding::ISO_8859_4: Encoding

Encoding::ISO_8859_5: Encoding

Encoding::ISO_8859_6: Encoding

Encoding::ISO_8859_7: Encoding

Encoding::ISO_8859_8: Encoding

Encoding::ISO_8859_9: Encoding

Encoding::KOI8_R: Encoding

Encoding::KOI8_U: Encoding

Encoding::MACCENTEURO: Encoding

Encoding::MACCROATIAN: Encoding

Encoding::MACCYRILLIC: Encoding

Encoding::MACGREEK: Encoding

Encoding::MACICELAND: Encoding

Encoding::MACJAPAN: Encoding

Encoding::MACJAPANESE: Encoding

Encoding::MACROMAN: Encoding

Encoding::MACROMANIA: Encoding

Encoding::MACTHAI: Encoding

Encoding::MACTURKISH: Encoding

Encoding::MACUKRAINE: Encoding

Encoding::MacCentEuro: Encoding

Encoding::MacCroatian: Encoding

Encoding::MacCyrillic: Encoding

Encoding::MacGreek: Encoding

Encoding::MacIceland: Encoding

Encoding::MacJapan: Encoding

Encoding::MacJapanese: Encoding

Encoding::MacRoman: Encoding

Encoding::MacRomania: Encoding

Encoding::MacThai: Encoding

Encoding::MacTurkish: Encoding

Encoding::MacUkraine: Encoding

Encoding::PCK: Encoding

Encoding::SHIFT_JIS: Encoding

Encoding::SJIS: Encoding

Encoding::SJIS_DOCOMO: Encoding

Encoding::SJIS_DoCoMo: Encoding

Encoding::SJIS_KDDI: Encoding

Encoding::SJIS_SOFTBANK: Encoding

Encoding::SJIS_SoftBank: Encoding

Encoding::STATELESS_ISO_2022_JP: Encoding

Encoding::STATELESS_ISO_2022_JP_KDDI: Encoding

Encoding::Shift_JIS: Encoding

Encoding::Stateless_ISO_2022_JP: Encoding

Encoding::Stateless_ISO_2022_JP_KDDI: Encoding

Encoding::TIS_620: Encoding

Encoding::UCS_2BE: Encoding

Encoding::UCS_4BE: Encoding

Encoding::UCS_4LE: Encoding

Encoding::US_ASCII: Encoding

Encoding::UTF8_DOCOMO: Encoding

Encoding::UTF8_DoCoMo: Encoding

Encoding::UTF8_KDDI: Encoding

Encoding::UTF8_MAC: Encoding

Encoding::UTF8_SOFTBANK: Encoding

Encoding::UTF8_SoftBank: Encoding

Encoding::UTF_16: Encoding

Encoding::UTF_16BE: Encoding

Encoding::UTF_16LE: Encoding

Encoding::UTF_32: Encoding

Encoding::UTF_32BE: Encoding

Encoding::UTF_32LE: Encoding

Encoding::UTF_7: Encoding

Encoding::UTF_8: Encoding

Encoding::UTF_8_HFS: Encoding

Encoding::UTF_8_MAC: Encoding

Encoding::WINDOWS_1250: Encoding

Encoding::WINDOWS_1251: Encoding

Encoding::WINDOWS_1252: Encoding

Encoding::WINDOWS_1253: Encoding

Encoding::WINDOWS_1254: Encoding

Encoding::WINDOWS_1255: Encoding

Encoding::WINDOWS_1256: Encoding

Encoding::WINDOWS_1257: Encoding

Encoding::WINDOWS_1258: Encoding

Encoding::WINDOWS_31J: Encoding

Encoding::WINDOWS_874: Encoding

Encoding::Windows_1250: Encoding

Encoding::Windows_1251: Encoding

Encoding::Windows_1252: Encoding

Encoding::Windows_1253: Encoding

Encoding::Windows_1254: Encoding

Encoding::Windows_1255: Encoding

Encoding::Windows_1256: Encoding

Encoding::Windows_1257: Encoding

Encoding::Windows_1258: Encoding

Encoding::Windows_31J: Encoding

Encoding::Windows_874: Encoding

class Encoding::Converter < Data
end

Encoding::Converter::AFTER_OUTPUT: Integer

Encoding::Converter::CRLF_NEWLINE_DECORATOR: Integer

Encoding::Converter::CR_NEWLINE_DECORATOR: Integer

Encoding::Converter::INVALID_MASK: Integer

Encoding::Converter::INVALID_REPLACE: Integer

Encoding::Converter::PARTIAL_INPUT: Integer

Encoding::Converter::UNDEF_HEX_CHARREF: Integer

Encoding::Converter::UNDEF_MASK: Integer

Encoding::Converter::UNDEF_REPLACE: Integer

Encoding::Converter::UNIVERSAL_NEWLINE_DECORATOR: Integer

Encoding::Converter::XML_ATTR_CONTENT_DECORATOR: Integer

Encoding::Converter::XML_ATTR_QUOTE_DECORATOR: Integer

Encoding::Converter::XML_TEXT_DECORATOR: Integer

class Encoding::CompatibilityError < EncodingError
end

class Encoding::ConverterNotFoundError < EncodingError
end

class Encoding::InvalidByteSequenceError < EncodingError
end

class Encoding::UndefinedConversionError < EncodingError
end