# typed: false

# DO NOT EDIT MANUALLY
# This is an autogenerated file for types exported from the `csv` gem.
# Please instead update this file by running `bin/tapioca gem csv`.


# source://csv//lib/csv/core_ext/array.rb#1
class Array
  include ::Enumerable

  # Equivalent to CSV::generate_line(self, options)
  #
  #   ["CSV", "data"].to_csv
  #     #=> "CSV,data\n"
  #
  # source://csv//lib/csv/core_ext/array.rb#6
  def to_csv(**options); end
end

# == \CSV
#
# === \CSV Data
#
# \CSV (comma-separated values) data is a text representation of a table:
# - A _row_ _separator_ delimits table rows.
#   A common row separator is the newline character <tt>"\n"</tt>.
# - A _column_ _separator_ delimits fields in a row.
#   A common column separator is the comma character <tt>","</tt>.
#
# This \CSV \String, with row separator <tt>"\n"</tt>
# and column separator <tt>","</tt>,
# has three rows and two columns:
#   "foo,0\nbar,1\nbaz,2\n"
#
# Despite the name \CSV, a \CSV representation can use different separators.
#
# For more about tables, see the Wikipedia article
# "{Table (information)}[https://en.wikipedia.org/wiki/Table_(information)]",
# especially its section
# "{Simple table}[https://en.wikipedia.org/wiki/Table_(information)#Simple_table]"
#
# == \Class \CSV
#
# Class \CSV provides methods for:
# - Parsing \CSV data from a \String object, a \File (via its file path), or an \IO object.
# - Generating \CSV data to a \String object.
#
# To make \CSV available:
#   require 'csv'
#
# All examples here assume that this has been done.
#
# == Keeping It Simple
#
# A \CSV object has dozens of instance methods that offer fine-grained control
# of parsing and generating \CSV data.
# For many needs, though, simpler approaches will do.
#
# This section summarizes the singleton methods in \CSV
# that allow you to parse and generate without explicitly
# creating \CSV objects.
# For details, follow the links.
#
# === Simple Parsing
#
# Parsing methods commonly return either of:
# - An \Array of Arrays of Strings:
#   - The outer \Array is the entire "table".
#   - Each inner \Array is a row.
#   - Each \String is a field.
# - A CSV::Table object.  For details, see
#   {\CSV with Headers}[#class-CSV-label-CSV+with+Headers].
#
# ==== Parsing a \String
#
# The input to be parsed can be a string:
#   string = "foo,0\nbar,1\nbaz,2\n"
#
# \Method CSV.parse returns the entire \CSV data:
#   CSV.parse(string) # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
#
# \Method CSV.parse_line returns only the first row:
#   CSV.parse_line(string) # => ["foo", "0"]
#
# \CSV extends class \String with instance method String#parse_csv,
# which also returns only the first row:
#   string.parse_csv # => ["foo", "0"]
#
# ==== Parsing Via a \File Path
#
# The input to be parsed can be in a file:
#   string = "foo,0\nbar,1\nbaz,2\n"
#   path = 't.csv'
#   File.write(path, string)
#
# \Method CSV.read returns the entire \CSV data:
#  CSV.read(path) # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
#
# \Method CSV.foreach iterates, passing each row to the given block:
#  CSV.foreach(path) do |row|
#    p row
#  end
# Output:
#   ["foo", "0"]
#   ["bar", "1"]
#   ["baz", "2"]
#
# \Method CSV.table returns the entire \CSV data as a CSV::Table object:
#   CSV.table(path) # => #<CSV::Table mode:col_or_row row_count:3>
#
# ==== Parsing from an Open \IO Stream
#
# The input to be parsed can be in an open \IO stream:
#
# \Method CSV.read returns the entire \CSV data:
#   File.open(path) do |file|
#     CSV.read(file)
#   end # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
#
# As does method CSV.parse:
#   File.open(path) do |file|
#     CSV.parse(file)
#   end # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
#
# \Method CSV.parse_line returns only the first row:
#   File.open(path) do |file|
#    CSV.parse_line(file)
#   end # => ["foo", "0"]
#
# \Method CSV.foreach iterates, passing each row to the given block:
#   File.open(path) do |file|
#     CSV.foreach(file) do |row|
#       p row
#     end
#   end
# Output:
#   ["foo", "0"]
#   ["bar", "1"]
#   ["baz", "2"]
#
# \Method CSV.table returns the entire \CSV data as a CSV::Table object:
#   File.open(path) do |file|
#     CSV.table(file)
#   end # => #<CSV::Table mode:col_or_row row_count:3>
#
# === Simple Generating
#
# \Method CSV.generate returns a \String;
# this example uses method CSV#<< to append the rows
# that are to be generated:
#   output_string = CSV.generate do |csv|
#     csv << ['foo', 0]
#     csv << ['bar', 1]
#     csv << ['baz', 2]
#   end
#   output_string # => "foo,0\nbar,1\nbaz,2\n"
#
# \Method CSV.generate_line returns a \String containing the single row
# constructed from an \Array:
#   CSV.generate_line(['foo', '0']) # => "foo,0\n"
#
# \CSV extends class \Array with instance method <tt>Array#to_csv</tt>,
# which forms an \Array into a \String:
#   ['foo', '0'].to_csv # => "foo,0\n"
#
# === "Filtering" \CSV
#
# \Method CSV.filter provides a Unix-style filter for \CSV data.
# The input data is processed to form the output data:
#   in_string = "foo,0\nbar,1\nbaz,2\n"
#   out_string = ''
#   CSV.filter(in_string, out_string) do |row|
#     row[0] = row[0].upcase
#     row[1] *= 4
#   end
#   out_string # => "FOO,0000\nBAR,1111\nBAZ,2222\n"
#
# == \CSV Objects
#
# There are three ways to create a \CSV object:
# - \Method CSV.new returns a new \CSV object.
# - \Method CSV.instance returns a new or cached \CSV object.
# - \Method \CSV() also returns a new or cached \CSV object.
#
# === Instance Methods
#
# \CSV has three groups of instance methods:
# - Its own internally defined instance methods.
# - Methods included by module Enumerable.
# - Methods delegated to class IO. See below.
#
# ==== Delegated Methods
#
# For convenience, a CSV object will delegate to many methods in class IO.
# (A few have wrapper "guard code" in \CSV.) You may call:
# * IO#binmode
# * #binmode?
# * IO#close
# * IO#close_read
# * IO#close_write
# * IO#closed?
# * #eof
# * #eof?
# * IO#external_encoding
# * IO#fcntl
# * IO#fileno
# * #flock
# * IO#flush
# * IO#fsync
# * IO#internal_encoding
# * #ioctl
# * IO#isatty
# * #path
# * IO#pid
# * IO#pos
# * IO#pos=
# * IO#reopen
# * #rewind
# * IO#seek
# * #stat
# * IO#string
# * IO#sync
# * IO#sync=
# * IO#tell
# * #to_i
# * #to_io
# * IO#truncate
# * IO#tty?
#
# === Options
#
# The default values for options are:
#   DEFAULT_OPTIONS = {
#     # For both parsing and generating.
#     col_sep:            ",",
#     row_sep:            :auto,
#     quote_char:         '"',
#     # For parsing.
#     field_size_limit:   nil,
#     converters:         nil,
#     unconverted_fields: nil,
#     headers:            false,
#     return_headers:     false,
#     header_converters:  nil,
#     skip_blanks:        false,
#     skip_lines:         nil,
#     liberal_parsing:    false,
#     nil_value:          nil,
#     empty_value:        "",
#     strip:              false,
#     # For generating.
#     write_headers:      nil,
#     quote_empty:        true,
#     force_quotes:       false,
#     write_converters:   nil,
#     write_nil_value:    nil,
#     write_empty_value:  "",
#   }
#
# ==== Options for Parsing
#
# Options for parsing, described in detail below, include:
# - +row_sep+: Specifies the row separator; used to delimit rows.
# - +col_sep+: Specifies the column separator; used to delimit fields.
# - +quote_char+: Specifies the quote character; used to quote fields.
# - +field_size_limit+: Specifies the maximum field size + 1 allowed.
#   Deprecated since 3.2.3. Use +max_field_size+ instead.
# - +max_field_size+: Specifies the maximum field size allowed.
# - +converters+: Specifies the field converters to be used.
# - +unconverted_fields+: Specifies whether unconverted fields are to be available.
# - +headers+: Specifies whether data contains headers,
#   or specifies the headers themselves.
# - +return_headers+: Specifies whether headers are to be returned.
# - +header_converters+: Specifies the header converters to be used.
# - +skip_blanks+: Specifies whether blanks lines are to be ignored.
# - +skip_lines+: Specifies how comments lines are to be recognized.
# - +strip+: Specifies whether leading and trailing whitespace are to be
#   stripped from fields. This must be compatible with +col_sep+; if it is not,
#   then an +ArgumentError+ exception will be raised.
# - +liberal_parsing+: Specifies whether \CSV should attempt to parse
#   non-compliant data.
# - +nil_value+: Specifies the object that is to be substituted for each null (no-text) field.
# - +empty_value+: Specifies the object that is to be substituted for each empty field.
#
# :include: ../doc/csv/options/common/row_sep.rdoc
#
# :include: ../doc/csv/options/common/col_sep.rdoc
#
# :include: ../doc/csv/options/common/quote_char.rdoc
#
# :include: ../doc/csv/options/parsing/field_size_limit.rdoc
#
# :include: ../doc/csv/options/parsing/converters.rdoc
#
# :include: ../doc/csv/options/parsing/unconverted_fields.rdoc
#
# :include: ../doc/csv/options/parsing/headers.rdoc
#
# :include: ../doc/csv/options/parsing/return_headers.rdoc
#
# :include: ../doc/csv/options/parsing/header_converters.rdoc
#
# :include: ../doc/csv/options/parsing/skip_blanks.rdoc
#
# :include: ../doc/csv/options/parsing/skip_lines.rdoc
#
# :include: ../doc/csv/options/parsing/strip.rdoc
#
# :include: ../doc/csv/options/parsing/liberal_parsing.rdoc
#
# :include: ../doc/csv/options/parsing/nil_value.rdoc
#
# :include: ../doc/csv/options/parsing/empty_value.rdoc
#
# ==== Options for Generating
#
# Options for generating, described in detail below, include:
# - +row_sep+: Specifies the row separator; used to delimit rows.
# - +col_sep+: Specifies the column separator; used to delimit fields.
# - +quote_char+: Specifies the quote character; used to quote fields.
# - +write_headers+: Specifies whether headers are to be written.
# - +force_quotes+: Specifies whether each output field is to be quoted.
# - +quote_empty+: Specifies whether each empty output field is to be quoted.
# - +write_converters+: Specifies the field converters to be used in writing.
# - +write_nil_value+: Specifies the object that is to be substituted for each +nil+-valued field.
# - +write_empty_value+: Specifies the object that is to be substituted for each empty field.
#
# :include: ../doc/csv/options/common/row_sep.rdoc
#
# :include: ../doc/csv/options/common/col_sep.rdoc
#
# :include: ../doc/csv/options/common/quote_char.rdoc
#
# :include: ../doc/csv/options/generating/write_headers.rdoc
#
# :include: ../doc/csv/options/generating/force_quotes.rdoc
#
# :include: ../doc/csv/options/generating/quote_empty.rdoc
#
# :include: ../doc/csv/options/generating/write_converters.rdoc
#
# :include: ../doc/csv/options/generating/write_nil_value.rdoc
#
# :include: ../doc/csv/options/generating/write_empty_value.rdoc
#
# === \CSV with Headers
#
# CSV allows to specify column names of CSV file, whether they are in data, or
# provided separately. If headers are specified, reading methods return an instance
# of CSV::Table, consisting of CSV::Row.
#
#   # Headers are part of data
#   data = CSV.parse(<<~ROWS, headers: true)
#     Name,Department,Salary
#     Bob,Engineering,1000
#     Jane,Sales,2000
#     John,Management,5000
#   ROWS
#
#   data.class      #=> CSV::Table
#   data.first      #=> #<CSV::Row "Name":"Bob" "Department":"Engineering" "Salary":"1000">
#   data.first.to_h #=> {"Name"=>"Bob", "Department"=>"Engineering", "Salary"=>"1000"}
#
#   # Headers provided by developer
#   data = CSV.parse('Bob,Engineering,1000', headers: %i[name department salary])
#   data.first      #=> #<CSV::Row name:"Bob" department:"Engineering" salary:"1000">
#
# === \Converters
#
# By default, each value (field or header) parsed by \CSV is formed into a \String.
# You can use a _field_ _converter_ or  _header_ _converter_
# to intercept and modify the parsed values:
# - See {Field Converters}[#class-CSV-label-Field+Converters].
# - See {Header Converters}[#class-CSV-label-Header+Converters].
#
# Also by default, each value to be written during generation is written 'as-is'.
# You can use a _write_ _converter_ to modify values before writing.
# - See {Write Converters}[#class-CSV-label-Write+Converters].
#
# ==== Specifying \Converters
#
# You can specify converters for parsing or generating in the +options+
# argument to various \CSV methods:
# - Option +converters+ for converting parsed field values.
# - Option +header_converters+ for converting parsed header values.
# - Option +write_converters+ for converting values to be written (generated).
#
# There are three forms for specifying converters:
# - A converter proc: executable code to be used for conversion.
# - A converter name: the name of a stored converter.
# - A converter list: an array of converter procs, converter names, and converter lists.
#
# ===== Converter Procs
#
# This converter proc, +strip_converter+, accepts a value +field+
# and returns <tt>field.strip</tt>:
#   strip_converter = proc {|field| field.strip }
# In this call to <tt>CSV.parse</tt>,
# the keyword argument <tt>converters: string_converter</tt>
# specifies that:
# - \Proc +string_converter+ is to be called for each parsed field.
# - The converter's return value is to replace the +field+ value.
# Example:
#   string = " foo , 0 \n bar , 1 \n baz , 2 \n"
#   array = CSV.parse(string, converters: strip_converter)
#   array # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
#
# A converter proc can receive a second argument, +field_info+,
# that contains details about the field.
# This modified +strip_converter+ displays its arguments:
#   strip_converter = proc do |field, field_info|
#     p [field, field_info]
#     field.strip
#   end
#   string = " foo , 0 \n bar , 1 \n baz , 2 \n"
#   array = CSV.parse(string, converters: strip_converter)
#   array # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
# Output:
#  [" foo ", #<struct CSV::FieldInfo index=0, line=1, header=nil>]
#  [" 0 ", #<struct CSV::FieldInfo index=1, line=1, header=nil>]
#  [" bar ", #<struct CSV::FieldInfo index=0, line=2, header=nil>]
#  [" 1 ", #<struct CSV::FieldInfo index=1, line=2, header=nil>]
#  [" baz ", #<struct CSV::FieldInfo index=0, line=3, header=nil>]
#  [" 2 ", #<struct CSV::FieldInfo index=1, line=3, header=nil>]
# Each CSV::FieldInfo object shows:
# - The 0-based field index.
# - The 1-based line index.
# - The field header, if any.
#
# ===== Stored \Converters
#
# A converter may be given a name and stored in a structure where
# the parsing methods can find it by name.
#
# The storage structure for field converters is the \Hash CSV::Converters.
# It has several built-in converter procs:
# - <tt>:integer</tt>: converts each \String-embedded integer into a true \Integer.
# - <tt>:float</tt>: converts each \String-embedded float into a true \Float.
# - <tt>:date</tt>: converts each \String-embedded date into a true \Date.
# - <tt>:date_time</tt>: converts each \String-embedded date-time into a true \DateTime
# - <tt>:time</tt>: converts each \String-embedded time into a true \Time
# .
# This example creates a converter proc, then stores it:
#   strip_converter = proc {|field| field.strip }
#   CSV::Converters[:strip] = strip_converter
# Then the parsing method call can refer to the converter
# by its name, <tt>:strip</tt>:
#   string = " foo , 0 \n bar , 1 \n baz , 2 \n"
#   array = CSV.parse(string, converters: :strip)
#   array # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
#
# The storage structure for header converters is the \Hash CSV::HeaderConverters,
# which works in the same way.
# It also has built-in converter procs:
# - <tt>:downcase</tt>: Downcases each header.
# - <tt>:symbol</tt>: Converts each header to a \Symbol.
#
# There is no such storage structure for write headers.
#
# In order for the parsing methods to access stored converters in non-main-Ractors, the
# storage structure must be made shareable first.
# Therefore, <tt>Ractor.make_shareable(CSV::Converters)</tt> and
# <tt>Ractor.make_shareable(CSV::HeaderConverters)</tt> must be called before the creation
# of Ractors that use the converters stored in these structures. (Since making the storage
# structures shareable involves freezing them, any custom converters that are to be used
# must be added first.)
#
# ===== Converter Lists
#
# A _converter_ _list_ is an \Array that may include any assortment of:
# - Converter procs.
# - Names of stored converters.
# - Nested converter lists.
#
# Examples:
#   numeric_converters = [:integer, :float]
#   date_converters = [:date, :date_time]
#   [numeric_converters, strip_converter]
#   [strip_converter, date_converters, :float]
#
# Like a converter proc, a converter list may be named and stored in either
# \CSV::Converters or CSV::HeaderConverters:
#   CSV::Converters[:custom] = [strip_converter, date_converters, :float]
#   CSV::HeaderConverters[:custom] = [:downcase, :symbol]
#
# There are two built-in converter lists:
#   CSV::Converters[:numeric] # => [:integer, :float]
#   CSV::Converters[:all] # => [:date_time, :numeric]
#
# ==== Field \Converters
#
# With no conversion, all parsed fields in all rows become Strings:
#   string = "foo,0\nbar,1\nbaz,2\n"
#   ary = CSV.parse(string)
#   ary # => # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
#
# When you specify a field converter, each parsed field is passed to the converter;
# its return value becomes the stored value for the field.
# A converter might, for example, convert an integer embedded in a \String
# into a true \Integer.
# (In fact, that's what built-in field converter +:integer+ does.)
#
# There are three ways to use field \converters.
#
# - Using option {converters}[#class-CSV-label-Option+converters] with a parsing method:
#     ary = CSV.parse(string, converters: :integer)
#     ary # => [0, 1, 2] # => [["foo", 0], ["bar", 1], ["baz", 2]]
# - Using option {converters}[#class-CSV-label-Option+converters] with a new \CSV instance:
#     csv = CSV.new(string, converters: :integer)
#     # Field converters in effect:
#     csv.converters # => [:integer]
#     csv.read # => [["foo", 0], ["bar", 1], ["baz", 2]]
# - Using method #convert to add a field converter to a \CSV instance:
#     csv = CSV.new(string)
#     # Add a converter.
#     csv.convert(:integer)
#     csv.converters # => [:integer]
#     csv.read # => [["foo", 0], ["bar", 1], ["baz", 2]]
#
# Installing a field converter does not affect already-read rows:
#   csv = CSV.new(string)
#   csv.shift # => ["foo", "0"]
#   # Add a converter.
#   csv.convert(:integer)
#   csv.converters # => [:integer]
#   csv.read # => [["bar", 1], ["baz", 2]]
#
# There are additional built-in \converters, and custom \converters are also supported.
#
# ===== Built-In Field \Converters
#
# The built-in field converters are in \Hash CSV::Converters:
# - Each key is a field converter name.
# - Each value is one of:
#   - A \Proc field converter.
#   - An \Array of field converter names.
#
# Display:
#   CSV::Converters.each_pair do |name, value|
#     if value.kind_of?(Proc)
#       p [name, value.class]
#     else
#       p [name, value]
#     end
#   end
# Output:
#   [:integer, Proc]
#   [:float, Proc]
#   [:numeric, [:integer, :float]]
#   [:date, Proc]
#   [:date_time, Proc]
#   [:time, Proc]
#   [:all, [:date_time, :numeric]]
#
# Each of these converters transcodes values to UTF-8 before attempting conversion.
# If a value cannot be transcoded to UTF-8 the conversion will
# fail and the value will remain unconverted.
#
# Converter +:integer+ converts each field that Integer() accepts:
#   data = '0,1,2,x'
#   # Without the converter
#   csv = CSV.parse_line(data)
#   csv # => ["0", "1", "2", "x"]
#   # With the converter
#   csv = CSV.parse_line(data, converters: :integer)
#   csv # => [0, 1, 2, "x"]
#
# Converter +:float+ converts each field that Float() accepts:
#   data = '1.0,3.14159,x'
#   # Without the converter
#   csv = CSV.parse_line(data)
#   csv # => ["1.0", "3.14159", "x"]
#   # With the converter
#   csv = CSV.parse_line(data, converters: :float)
#   csv # => [1.0, 3.14159, "x"]
#
# Converter +:numeric+ converts with both +:integer+ and +:float+..
#
# Converter +:date+ converts each field that Date::parse accepts:
#   data = '2001-02-03,x'
#   # Without the converter
#   csv = CSV.parse_line(data)
#   csv # => ["2001-02-03", "x"]
#   # With the converter
#   csv = CSV.parse_line(data, converters: :date)
#   csv # => [#<Date: 2001-02-03 ((2451944j,0s,0n),+0s,2299161j)>, "x"]
#
# Converter +:date_time+ converts each field that DateTime::parse accepts:
#   data = '2020-05-07T14:59:00-05:00,x'
#   # Without the converter
#   csv = CSV.parse_line(data)
#   csv # => ["2020-05-07T14:59:00-05:00", "x"]
#   # With the converter
#   csv = CSV.parse_line(data, converters: :date_time)
#   csv # => [#<DateTime: 2020-05-07T14:59:00-05:00 ((2458977j,71940s,0n),-18000s,2299161j)>, "x"]
#
# Converter +time+ converts each field that Time::parse accepts:
#   data = '2020-05-07T14:59:00-05:00,x'
#   # Without the converter
#   csv = CSV.parse_line(data)
#   csv # => ["2020-05-07T14:59:00-05:00", "x"]
#   # With the converter
#   csv = CSV.parse_line(data, converters: :time)
#   csv # => [2020-05-07 14:59:00 -0500, "x"]
#
# Converter +:numeric+ converts with both +:date_time+ and +:numeric+..
#
# As seen above, method #convert adds \converters to a \CSV instance,
# and method #converters returns an \Array of the \converters in effect:
#   csv = CSV.new('0,1,2')
#   csv.converters # => []
#   csv.convert(:integer)
#   csv.converters # => [:integer]
#   csv.convert(:date)
#   csv.converters # => [:integer, :date]
#
# ===== Custom Field \Converters
#
# You can define a custom field converter:
#   strip_converter = proc {|field| field.strip }
#   string = " foo , 0 \n bar , 1 \n baz , 2 \n"
#   array = CSV.parse(string, converters: strip_converter)
#   array # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
# You can register the converter in \Converters \Hash,
# which allows you to refer to it by name:
#   CSV::Converters[:strip] = strip_converter
#   string = " foo , 0 \n bar , 1 \n baz , 2 \n"
#   array = CSV.parse(string, converters: :strip)
#   array # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
#
# ==== Header \Converters
#
# Header converters operate only on headers (and not on other rows).
#
# There are three ways to use header \converters;
# these examples use built-in header converter +:downcase+,
# which downcases each parsed header.
#
# - Option +header_converters+ with a singleton parsing method:
#     string = "Name,Count\nFoo,0\n,Bar,1\nBaz,2"
#     tbl = CSV.parse(string, headers: true, header_converters: :downcase)
#     tbl.class # => CSV::Table
#     tbl.headers # => ["name", "count"]
#
# - Option +header_converters+ with a new \CSV instance:
#     csv = CSV.new(string, header_converters: :downcase)
#     # Header converters in effect:
#     csv.header_converters # => [:downcase]
#     tbl = CSV.parse(string, headers: true)
#     tbl.headers # => ["Name", "Count"]
#
# - Method #header_convert adds a header converter to a \CSV instance:
#     csv = CSV.new(string)
#     # Add a header converter.
#     csv.header_convert(:downcase)
#     csv.header_converters # => [:downcase]
#     tbl = CSV.parse(string, headers: true)
#     tbl.headers # => ["Name", "Count"]
#
# ===== Built-In Header \Converters
#
# The built-in header \converters are in \Hash CSV::HeaderConverters.
# The keys there are the names of the \converters:
#   CSV::HeaderConverters.keys # => [:downcase, :symbol]
#
# Converter +:downcase+ converts each header by downcasing it:
#   string = "Name,Count\nFoo,0\n,Bar,1\nBaz,2"
#   tbl = CSV.parse(string, headers: true, header_converters: :downcase)
#   tbl.class # => CSV::Table
#   tbl.headers # => ["name", "count"]
#
# Converter +:symbol+ converts each header by making it into a \Symbol:
#   string = "Name,Count\nFoo,0\n,Bar,1\nBaz,2"
#   tbl = CSV.parse(string, headers: true, header_converters: :symbol)
#   tbl.headers # => [:name, :count]
# Details:
# - Strips leading and trailing whitespace.
# - Downcases the header.
# - Replaces embedded spaces with underscores.
# - Removes non-word characters.
# - Makes the string into a \Symbol.
#
# ===== Custom Header \Converters
#
# You can define a custom header converter:
#   upcase_converter = proc {|header| header.upcase }
#   string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
#   table = CSV.parse(string, headers: true, header_converters: upcase_converter)
#   table # => #<CSV::Table mode:col_or_row row_count:4>
#   table.headers # => ["NAME", "VALUE"]
# You can register the converter in \HeaderConverters \Hash,
# which allows you to refer to it by name:
#   CSV::HeaderConverters[:upcase] = upcase_converter
#   table = CSV.parse(string, headers: true, header_converters: :upcase)
#   table # => #<CSV::Table mode:col_or_row row_count:4>
#   table.headers # => ["NAME", "VALUE"]
#
# ===== Write \Converters
#
# When you specify a write converter for generating \CSV,
# each field to be written is passed to the converter;
# its return value becomes the new value for the field.
# A converter might, for example, strip whitespace from a field.
#
# Using no write converter (all fields unmodified):
#   output_string = CSV.generate do |csv|
#     csv << [' foo ', 0]
#     csv << [' bar ', 1]
#     csv << [' baz ', 2]
#   end
#   output_string # => " foo ,0\n bar ,1\n baz ,2\n"
# Using option +write_converters+ with two custom write converters:
#   strip_converter = proc {|field| field.respond_to?(:strip) ? field.strip : field }
#   upcase_converter = proc {|field| field.respond_to?(:upcase) ? field.upcase : field }
#   write_converters = [strip_converter, upcase_converter]
#   output_string = CSV.generate(write_converters: write_converters) do |csv|
#     csv << [' foo ', 0]
#     csv << [' bar ', 1]
#     csv << [' baz ', 2]
#   end
#   output_string # => "FOO,0\nBAR,1\nBAZ,2\n"
#
# === Character Encodings (M17n or Multilingualization)
#
# This new CSV parser is m17n savvy.  The parser works in the Encoding of the IO
# or String object being read from or written to. Your data is never transcoded
# (unless you ask Ruby to transcode it for you) and will literally be parsed in
# the Encoding it is in. Thus CSV will return Arrays or Rows of Strings in the
# Encoding of your data. This is accomplished by transcoding the parser itself
# into your Encoding.
#
# Some transcoding must take place, of course, to accomplish this multiencoding
# support. For example, <tt>:col_sep</tt>, <tt>:row_sep</tt>, and
# <tt>:quote_char</tt> must be transcoded to match your data.  Hopefully this
# makes the entire process feel transparent, since CSV's defaults should just
# magically work for your data. However, you can set these values manually in
# the target Encoding to avoid the translation.
#
# It's also important to note that while all of CSV's core parser is now
# Encoding agnostic, some features are not. For example, the built-in
# converters will try to transcode data to UTF-8 before making conversions.
# Again, you can provide custom converters that are aware of your Encodings to
# avoid this translation. It's just too hard for me to support native
# conversions in all of Ruby's Encodings.
#
# Anyway, the practical side of this is simple: make sure IO and String objects
# passed into CSV have the proper Encoding set and everything should just work.
# CSV methods that allow you to open IO objects (CSV::foreach(), CSV::open(),
# CSV::read(), and CSV::readlines()) do allow you to specify the Encoding.
#
# One minor exception comes when generating CSV into a String with an Encoding
# that is not ASCII compatible. There's no existing data for CSV to use to
# prepare itself and thus you will probably need to manually specify the desired
# Encoding for most of those cases. It will try to guess using the fields in a
# row of output though, when using CSV::generate_line() or Array#to_csv().
#
# I try to point out any other Encoding issues in the documentation of methods
# as they come up.
#
# This has been tested to the best of my ability with all non-"dummy" Encodings
# Ruby ships with. However, it is brave new code and may have some bugs.
# Please feel free to {report}[mailto:james@grayproductions.net] any issues you
# find with it.
#
# source://csv//lib/csv/fields_converter.rb#3
class CSV
  include ::Enumerable
  extend ::Forwardable

  # :call-seq:
  #   CSV.new(string)
  #   CSV.new(io)
  #   CSV.new(string, **options)
  #   CSV.new(io, **options)
  #
  # Returns the new \CSV object created using +string+ or +io+
  # and the specified +options+.
  #
  # - Argument +string+ should be a \String object;
  #   it will be put into a new StringIO object positioned at the beginning.
  # :include: ../doc/csv/arguments/io.rdoc
  # - Argument +options+: See:
  #   * {Options for Parsing}[#class-CSV-label-Options+for+Parsing]
  #   * {Options for Generating}[#class-CSV-label-Options+for+Generating]
  #   For performance reasons, the options cannot be overridden
  #   in a \CSV object, so those specified here will endure.
  #
  # In addition to the \CSV instance methods, several \IO methods are delegated.
  # See {Delegated Methods}[#class-CSV-label-Delegated+Methods].
  #
  # ---
  #
  # Create a \CSV object from a \String object:
  #   csv = CSV.new('foo,0')
  #
  # Create a \CSV object from a \File object:
  #   File.write('t.csv', 'foo,0')
  #   csv = CSV.new(File.open('t.csv'))
  #
  # ---
  #
  # Raises an exception if the argument is +nil+:
  #   # Raises ArgumentError (Cannot parse nil as CSV):
  #   CSV.new(nil)
  #
  # @raise [ArgumentError]
  # @return [CSV] a new instance of CSV
  #
  # source://csv//lib/csv.rb#2034
  def initialize(data, col_sep: T.unsafe(nil), row_sep: T.unsafe(nil), quote_char: T.unsafe(nil), field_size_limit: T.unsafe(nil), max_field_size: T.unsafe(nil), converters: T.unsafe(nil), unconverted_fields: T.unsafe(nil), headers: T.unsafe(nil), return_headers: T.unsafe(nil), write_headers: T.unsafe(nil), header_converters: T.unsafe(nil), skip_blanks: T.unsafe(nil), force_quotes: T.unsafe(nil), skip_lines: T.unsafe(nil), liberal_parsing: T.unsafe(nil), internal_encoding: T.unsafe(nil), external_encoding: T.unsafe(nil), encoding: T.unsafe(nil), nil_value: T.unsafe(nil), empty_value: T.unsafe(nil), strip: T.unsafe(nil), quote_empty: T.unsafe(nil), write_converters: T.unsafe(nil), write_nil_value: T.unsafe(nil), write_empty_value: T.unsafe(nil)); end

  # :call-seq:
  #   csv << row -> self
  #
  # Appends a row to +self+.
  #
  # - Argument +row+ must be an \Array object or a CSV::Row object.
  # - The output stream must be open for writing.
  #
  # ---
  #
  # Append Arrays:
  #   CSV.generate do |csv|
  #     csv << ['foo', 0]
  #     csv << ['bar', 1]
  #     csv << ['baz', 2]
  #   end # => "foo,0\nbar,1\nbaz,2\n"
  #
  # Append CSV::Rows:
  #   headers = []
  #   CSV.generate do |csv|
  #     csv << CSV::Row.new(headers, ['foo', 0])
  #     csv << CSV::Row.new(headers, ['bar', 1])
  #     csv << CSV::Row.new(headers, ['baz', 2])
  #   end # => "foo,0\nbar,1\nbaz,2\n"
  #
  # Headers in CSV::Row objects are not appended:
  #   headers = ['Name', 'Count']
  #   CSV.generate do |csv|
  #     csv << CSV::Row.new(headers, ['foo', 0])
  #     csv << CSV::Row.new(headers, ['bar', 1])
  #     csv << CSV::Row.new(headers, ['baz', 2])
  #   end # => "foo,0\nbar,1\nbaz,2\n"
  #
  # ---
  #
  # Raises an exception if +row+ is not an \Array or \CSV::Row:
  #   CSV.generate do |csv|
  #     # Raises NoMethodError (undefined method `collect' for :foo:Symbol)
  #     csv << :foo
  #   end
  #
  # Raises an exception if the output stream is not opened for writing:
  #   path = 't.csv'
  #   File.write(path, '')
  #   File.open(path) do |file|
  #     CSV.open(file) do |csv|
  #       # Raises IOError (not opened for writing)
  #       csv << ['foo', 0]
  #     end
  #   end
  #
  # source://csv//lib/csv.rb#2507
  def <<(row); end

  # :call-seq:
  #   csv << row -> self
  #
  # Appends a row to +self+.
  #
  # - Argument +row+ must be an \Array object or a CSV::Row object.
  # - The output stream must be open for writing.
  #
  # ---
  #
  # Append Arrays:
  #   CSV.generate do |csv|
  #     csv << ['foo', 0]
  #     csv << ['bar', 1]
  #     csv << ['baz', 2]
  #   end # => "foo,0\nbar,1\nbaz,2\n"
  #
  # Append CSV::Rows:
  #   headers = []
  #   CSV.generate do |csv|
  #     csv << CSV::Row.new(headers, ['foo', 0])
  #     csv << CSV::Row.new(headers, ['bar', 1])
  #     csv << CSV::Row.new(headers, ['baz', 2])
  #   end # => "foo,0\nbar,1\nbaz,2\n"
  #
  # Headers in CSV::Row objects are not appended:
  #   headers = ['Name', 'Count']
  #   CSV.generate do |csv|
  #     csv << CSV::Row.new(headers, ['foo', 0])
  #     csv << CSV::Row.new(headers, ['bar', 1])
  #     csv << CSV::Row.new(headers, ['baz', 2])
  #   end # => "foo,0\nbar,1\nbaz,2\n"
  #
  # ---
  #
  # Raises an exception if +row+ is not an \Array or \CSV::Row:
  #   CSV.generate do |csv|
  #     # Raises NoMethodError (undefined method `collect' for :foo:Symbol)
  #     csv << :foo
  #   end
  #
  # Raises an exception if the output stream is not opened for writing:
  #   path = 't.csv'
  #   File.write(path, '')
  #   File.open(path) do |file|
  #     CSV.open(file) do |csv|
  #       # Raises IOError (not opened for writing)
  #       csv << ['foo', 0]
  #     end
  #   end
  #
  # source://csv//lib/csv.rb#2511
  def add_row(row); end

  # source://csv//lib/csv.rb#2389
  def binmode(*args, **_arg1, &block); end

  # @return [Boolean]
  #
  # source://csv//lib/csv.rb#2396
  def binmode?; end

  # source://csv//lib/csv.rb#2389
  def close(*args, **_arg1, &block); end

  # source://csv//lib/csv.rb#2389
  def close_read(*args, **_arg1, &block); end

  # source://csv//lib/csv.rb#2389
  def close_write(*args, **_arg1, &block); end

  # source://csv//lib/csv.rb#2389
  def closed?(*args, **_arg1, &block); end

  # :call-seq:
  #   csv.col_sep -> string
  #
  # Returns the encoded column separator; used for parsing and writing;
  # see {Option +col_sep+}[#class-CSV-label-Option+col_sep]:
  #   CSV.new('').col_sep # => ","
  #
  # source://csv//lib/csv.rb#2144
  def col_sep; end

  # :call-seq:
  #   convert(converter_name) -> array_of_procs
  #   convert {|field, field_info| ... } -> array_of_procs
  #
  # - With no block, installs a field converter (a \Proc).
  # - With a block, defines and installs a custom field converter.
  # - Returns the \Array of installed field converters.
  #
  # - Argument +converter_name+, if given, should be the name
  #   of an existing field converter.
  #
  # See {Field Converters}[#class-CSV-label-Field+Converters].
  # ---
  #
  # With no block, installs a field converter:
  #   csv = CSV.new('')
  #   csv.convert(:integer)
  #   csv.convert(:float)
  #   csv.convert(:date)
  #   csv.converters # => [:integer, :float, :date]
  #
  # ---
  #
  # The block, if given, is called for each field:
  # - Argument +field+ is the field value.
  # - Argument +field_info+ is a CSV::FieldInfo object
  #   containing details about the field.
  #
  # The examples here assume the prior execution of:
  #   string = "foo,0\nbar,1\nbaz,2\n"
  #   path = 't.csv'
  #   File.write(path, string)
  #
  # Example giving a block:
  #   csv = CSV.open(path)
  #   csv.convert {|field, field_info| p [field, field_info]; field.upcase }
  #   csv.read # => [["FOO", "0"], ["BAR", "1"], ["BAZ", "2"]]
  #
  # Output:
  #   ["foo", #<struct CSV::FieldInfo index=0, line=1, header=nil>]
  #   ["0", #<struct CSV::FieldInfo index=1, line=1, header=nil>]
  #   ["bar", #<struct CSV::FieldInfo index=0, line=2, header=nil>]
  #   ["1", #<struct CSV::FieldInfo index=1, line=2, header=nil>]
  #   ["baz", #<struct CSV::FieldInfo index=0, line=3, header=nil>]
  #   ["2", #<struct CSV::FieldInfo index=1, line=3, header=nil>]
  #
  # The block need not return a \String object:
  #   csv = CSV.open(path)
  #   csv.convert {|field, field_info| field.to_sym }
  #   csv.read # => [[:foo, :"0"], [:bar, :"1"], [:baz, :"2"]]
  #
  # If +converter_name+ is given, the block is not called:
  #   csv = CSV.open(path)
  #   csv.convert(:integer) {|field, field_info| fail 'Cannot happen' }
  #   csv.read # => [["foo", 0], ["bar", 1], ["baz", 2]]
  #
  # ---
  #
  # Raises a parse-time exception if +converter_name+ is not the name of a built-in
  # field converter:
  #   csv = CSV.open(path)
  #   csv.convert(:nosuch) => [nil]
  #   # Raises NoMethodError (undefined method `arity' for nil:NilClass)
  #   csv.read
  #
  # source://csv//lib/csv.rb#2578
  def convert(name = T.unsafe(nil), &converter); end

  # :call-seq:
  #   csv.converters -> array
  #
  # Returns an \Array containing field converters;
  # see {Field Converters}[#class-CSV-label-Field+Converters]:
  #   csv = CSV.new('')
  #   csv.converters # => []
  #   csv.convert(:integer)
  #   csv.converters # => [:integer]
  #   csv.convert(proc {|x| x.to_s })
  #   csv.converters
  #
  # Notes that you need to call
  # +Ractor.make_shareable(CSV::Converters)+ on the main Ractor to use
  # this method.
  #
  # source://csv//lib/csv.rb#2217
  def converters; end

  # :call-seq:
  #   csv.each -> enumerator
  #   csv.each {|row| ...}
  #
  # Calls the block with each successive row.
  # The data source must be opened for reading.
  #
  # Without headers:
  #   string = "foo,0\nbar,1\nbaz,2\n"
  #   csv = CSV.new(string)
  #   csv.each do |row|
  #     p row
  #   end
  # Output:
  #   ["foo", "0"]
  #   ["bar", "1"]
  #   ["baz", "2"]
  #
  # With headers:
  #   string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   csv = CSV.new(string, headers: true)
  #   csv.each do |row|
  #     p row
  #   end
  # Output:
  #   <CSV::Row "Name":"foo" "Value":"0">
  #   <CSV::Row "Name":"bar" "Value":"1">
  #   <CSV::Row "Name":"baz" "Value":"2">
  #
  # ---
  #
  # Raises an exception if the source is not opened for reading:
  #   string = "foo,0\nbar,1\nbaz,2\n"
  #   csv = CSV.new(string)
  #   csv.close
  #   # Raises IOError (not opened for reading)
  #   csv.each do |row|
  #     p row
  #   end
  #
  # source://csv//lib/csv.rb#2689
  def each(&block); end

  # :call-seq:
  #   csv.encoding -> encoding
  #
  # Returns the encoding used for parsing and generating;
  # see {Character Encodings (M17n or Multilingualization)}[#class-CSV-label-Character+Encodings+-28M17n+or+Multilingualization-29]:
  #   CSV.new('').encoding # => #<Encoding:UTF-8>
  #
  # source://csv//lib/csv.rb#2327
  def encoding; end

  # @return [Boolean]
  #
  # source://csv//lib/csv.rb#2444
  def eof; end

  # @return [Boolean]
  #
  # source://csv//lib/csv.rb#2432
  def eof?; end

  # source://csv//lib/csv.rb#2389
  def external_encoding(*args, **_arg1, &block); end

  # source://csv//lib/csv.rb#2389
  def fcntl(*args, **_arg1, &block); end

  # :call-seq:
  #   csv.field_size_limit -> integer or nil
  #
  # Returns the limit for field size; used for parsing;
  # see {Option +field_size_limit+}[#class-CSV-label-Option+field_size_limit]:
  #   CSV.new('').field_size_limit # => nil
  #
  # Deprecated since 3.2.3. Use +max_field_size+ instead.
  #
  # source://csv//lib/csv.rb#2176
  def field_size_limit; end

  # source://csv//lib/csv.rb#2389
  def fileno(*args, **_arg1, &block); end

  # @raise [NotImplementedError]
  #
  # source://csv//lib/csv.rb#2404
  def flock(*args); end

  # source://csv//lib/csv.rb#2389
  def flush(*args, **_arg1, &block); end

  # :call-seq:
  #   csv.force_quotes? -> true or false
  #
  # Returns the value that determines whether all output fields are to be quoted;
  # used for generating;
  # see {Option +force_quotes+}[#class-CSV-label-Option+force_quotes]:
  #   CSV.new('').force_quotes? # => false
  #
  # @return [Boolean]
  #
  # source://csv//lib/csv.rb#2307
  def force_quotes?; end

  # source://csv//lib/csv.rb#2389
  def fsync(*args, **_arg1, &block); end

  # :call-seq:
  #   csv.shift -> array, csv_row, or nil
  #
  # Returns the next row of data as:
  # - An \Array if no headers are used.
  # - A CSV::Row object if headers are used.
  #
  # The data source must be opened for reading.
  #
  # Without headers:
  #   string = "foo,0\nbar,1\nbaz,2\n"
  #   csv = CSV.new(string)
  #   csv.shift # => ["foo", "0"]
  #   csv.shift # => ["bar", "1"]
  #   csv.shift # => ["baz", "2"]
  #   csv.shift # => nil
  #
  # With headers:
  #   string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   csv = CSV.new(string, headers: true)
  #   csv.shift # => #<CSV::Row "Name":"foo" "Value":"0">
  #   csv.shift # => #<CSV::Row "Name":"bar" "Value":"1">
  #   csv.shift # => #<CSV::Row "Name":"baz" "Value":"2">
  #   csv.shift # => nil
  #
  # ---
  #
  # Raises an exception if the source is not opened for reading:
  #   string = "foo,0\nbar,1\nbaz,2\n"
  #   csv = CSV.new(string)
  #   csv.close
  #   # Raises IOError (not opened for reading)
  #   csv.shift
  #
  # source://csv//lib/csv.rb#2814
  def gets; end

  # The block need not return a \String object:
  #   csv = CSV.open(path, headers: true)
  #   csv.header_convert {|header, field_info| header.to_sym }
  #   table = csv.read
  #   table.headers # => [:Name, :Value]
  #
  # If +converter_name+ is given, the block is not called:
  #   csv = CSV.open(path, headers: true)
  #   csv.header_convert(:downcase) {|header, field_info| fail 'Cannot happen' }
  #   table = csv.read
  #   table.headers # => ["name", "value"]
  # ---
  #
  # Raises a parse-time exception if +converter_name+ is not the name of a built-in
  # field converter:
  #   csv = CSV.open(path, headers: true)
  #   csv.header_convert(:nosuch)
  #   # Raises NoMethodError (undefined method `arity' for nil:NilClass)
  #   csv.read
  #
  # source://csv//lib/csv.rb#2644
  def header_convert(name = T.unsafe(nil), &converter); end

  # :call-seq:
  #   csv.header_converters -> array
  #
  # Returns an \Array containing header converters; used for parsing;
  # see {Header Converters}[#class-CSV-label-Header+Converters]:
  #   CSV.new('').header_converters # => []
  #
  # Notes that you need to call
  # +Ractor.make_shareable(CSV::HeaderConverters)+ on the main Ractor
  # to use this method.
  #
  # source://csv//lib/csv.rb#2283
  def header_converters; end

  # :call-seq:
  #   csv.header_row? -> true or false
  #
  # Returns +true+ if the next row to be read is a header row\;
  # +false+ otherwise.
  #
  # Without headers:
  #   string = "foo,0\nbar,1\nbaz,2\n"
  #   csv = CSV.new(string)
  #   csv.header_row? # => false
  #
  # With headers:
  #   string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   csv = CSV.new(string, headers: true)
  #   csv.header_row? # => true
  #   csv.shift # => #<CSV::Row "Name":"foo" "Value":"0">
  #   csv.header_row? # => false
  #
  # ---
  #
  # Raises an exception if the source is not opened for reading:
  #   string = "foo,0\nbar,1\nbaz,2\n"
  #   csv = CSV.new(string)
  #   csv.close
  #   # Raises IOError (not opened for reading)
  #   csv.header_row?
  #
  # @return [Boolean]
  #
  # source://csv//lib/csv.rb#2766
  def header_row?; end

  # :call-seq:
  #   csv.headers -> object
  #
  # Returns the value that determines whether headers are used; used for parsing;
  # see {Option +headers+}[#class-CSV-label-Option+headers]:
  #   CSV.new('').headers # => nil
  #
  # source://csv//lib/csv.rb#2241
  def headers; end

  # :call-seq:
  #   csv.inspect -> string
  #
  # Returns a \String showing certain properties of +self+:
  #   string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   csv = CSV.new(string, headers: true)
  #   s = csv.inspect
  #
  # source://csv//lib/csv.rb#2825
  def inspect; end

  # source://csv//lib/csv.rb#2389
  def internal_encoding(*args, **_arg1, &block); end

  # @raise [NotImplementedError]
  #
  # source://csv//lib/csv.rb#2409
  def ioctl(*args); end

  # source://csv//lib/csv.rb#2389
  def isatty(*args, **_arg1, &block); end

  # :call-seq:
  #   csv.liberal_parsing? -> true or false
  #
  # Returns the value that determines whether illegal input is to be handled; used for parsing;
  # see {Option +liberal_parsing+}[#class-CSV-label-Option+liberal_parsing]:
  #   CSV.new('').liberal_parsing? # => false
  #
  # @return [Boolean]
  #
  # source://csv//lib/csv.rb#2317
  def liberal_parsing?; end

  # :call-seq:
  #   csv.line -> array
  #
  # Returns the line most recently read:
  #   string = "foo,0\nbar,1\nbaz,2\n"
  #   path = 't.csv'
  #   File.write(path, string)
  #   CSV.open(path) do |csv|
  #     csv.each do |row|
  #       p [csv.lineno, csv.line]
  #     end
  #   end
  # Output:
  #   [1, "foo,0\n"]
  #   [2, "bar,1\n"]
  #   [3, "baz,2\n"]
  #
  # source://csv//lib/csv.rb#2382
  def line; end

  # :call-seq:
  #   csv.line_no -> integer
  #
  # Returns the count of the rows parsed or generated.
  #
  # Parsing:
  #   string = "foo,0\nbar,1\nbaz,2\n"
  #   path = 't.csv'
  #   File.write(path, string)
  #   CSV.open(path) do |csv|
  #     csv.each do |row|
  #       p [csv.lineno, row]
  #     end
  #   end
  # Output:
  #   [1, ["foo", "0"]]
  #   [2, ["bar", "1"]]
  #   [3, ["baz", "2"]]
  #
  # Generating:
  #   CSV.generate do |csv|
  #     p csv.lineno; csv << ['foo', 0]
  #     p csv.lineno; csv << ['bar', 1]
  #     p csv.lineno; csv << ['baz', 2]
  #   end
  # Output:
  #   0
  #   1
  #   2
  #
  # source://csv//lib/csv.rb#2358
  def lineno; end

  # :call-seq:
  #   csv.max_field_size -> integer or nil
  #
  # Returns the limit for field size; used for parsing;
  # see {Option +max_field_size+}[#class-CSV-label-Option+max_field_size]:
  #   CSV.new('').max_field_size # => nil
  #
  # Since 3.2.3.
  #
  # source://csv//lib/csv.rb#2188
  def max_field_size; end

  # source://csv//lib/csv.rb#2414
  def path; end

  # source://csv//lib/csv.rb#2389
  def pid(*args, **_arg1, &block); end

  # source://csv//lib/csv.rb#2389
  def pos(*args, **_arg1, &block); end

  # source://csv//lib/csv.rb#2389
  def pos=(*args, **_arg1, &block); end

  # :call-seq:
  #   csv << row -> self
  #
  # Appends a row to +self+.
  #
  # - Argument +row+ must be an \Array object or a CSV::Row object.
  # - The output stream must be open for writing.
  #
  # ---
  #
  # Append Arrays:
  #   CSV.generate do |csv|
  #     csv << ['foo', 0]
  #     csv << ['bar', 1]
  #     csv << ['baz', 2]
  #   end # => "foo,0\nbar,1\nbaz,2\n"
  #
  # Append CSV::Rows:
  #   headers = []
  #   CSV.generate do |csv|
  #     csv << CSV::Row.new(headers, ['foo', 0])
  #     csv << CSV::Row.new(headers, ['bar', 1])
  #     csv << CSV::Row.new(headers, ['baz', 2])
  #   end # => "foo,0\nbar,1\nbaz,2\n"
  #
  # Headers in CSV::Row objects are not appended:
  #   headers = ['Name', 'Count']
  #   CSV.generate do |csv|
  #     csv << CSV::Row.new(headers, ['foo', 0])
  #     csv << CSV::Row.new(headers, ['bar', 1])
  #     csv << CSV::Row.new(headers, ['baz', 2])
  #   end # => "foo,0\nbar,1\nbaz,2\n"
  #
  # ---
  #
  # Raises an exception if +row+ is not an \Array or \CSV::Row:
  #   CSV.generate do |csv|
  #     # Raises NoMethodError (undefined method `collect' for :foo:Symbol)
  #     csv << :foo
  #   end
  #
  # Raises an exception if the output stream is not opened for writing:
  #   path = 't.csv'
  #   File.write(path, '')
  #   File.open(path) do |file|
  #     CSV.open(file) do |csv|
  #       # Raises IOError (not opened for writing)
  #       csv << ['foo', 0]
  #     end
  #   end
  #
  # source://csv//lib/csv.rb#2512
  def puts(row); end

  # :call-seq:
  #   csv.quote_char -> character
  #
  # Returns the encoded quote character; used for parsing and writing;
  # see {Option +quote_char+}[#class-CSV-label-Option+quote_char]:
  #   CSV.new('').quote_char # => "\""
  #
  # source://csv//lib/csv.rb#2164
  def quote_char; end

  # :call-seq:
  #   csv.read -> array or csv_table
  #
  # Forms the remaining rows from +self+ into:
  # - A CSV::Table object, if headers are in use.
  # - An \Array of Arrays, otherwise.
  #
  # The data source must be opened for reading.
  #
  # Without headers:
  #   string = "foo,0\nbar,1\nbaz,2\n"
  #   path = 't.csv'
  #   File.write(path, string)
  #   csv = CSV.open(path)
  #   csv.read # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
  #
  # With headers:
  #   string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   path = 't.csv'
  #   File.write(path, string)
  #   csv = CSV.open(path, headers: true)
  #   csv.read # => #<CSV::Table mode:col_or_row row_count:4>
  #
  # ---
  #
  # Raises an exception if the source is not opened for reading:
  #   string = "foo,0\nbar,1\nbaz,2\n"
  #   csv = CSV.new(string)
  #   csv.close
  #   # Raises IOError (not opened for reading)
  #   csv.read
  #
  # source://csv//lib/csv.rb#2730
  def read; end

  # :call-seq:
  #   csv.shift -> array, csv_row, or nil
  #
  # Returns the next row of data as:
  # - An \Array if no headers are used.
  # - A CSV::Row object if headers are used.
  #
  # The data source must be opened for reading.
  #
  # Without headers:
  #   string = "foo,0\nbar,1\nbaz,2\n"
  #   csv = CSV.new(string)
  #   csv.shift # => ["foo", "0"]
  #   csv.shift # => ["bar", "1"]
  #   csv.shift # => ["baz", "2"]
  #   csv.shift # => nil
  #
  # With headers:
  #   string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   csv = CSV.new(string, headers: true)
  #   csv.shift # => #<CSV::Row "Name":"foo" "Value":"0">
  #   csv.shift # => #<CSV::Row "Name":"bar" "Value":"1">
  #   csv.shift # => #<CSV::Row "Name":"baz" "Value":"2">
  #   csv.shift # => nil
  #
  # ---
  #
  # Raises an exception if the source is not opened for reading:
  #   string = "foo,0\nbar,1\nbaz,2\n"
  #   csv = CSV.new(string)
  #   csv.close
  #   # Raises IOError (not opened for reading)
  #   csv.shift
  #
  # source://csv//lib/csv.rb#2815
  def readline; end

  # :call-seq:
  #   csv.read -> array or csv_table
  #
  # Forms the remaining rows from +self+ into:
  # - A CSV::Table object, if headers are in use.
  # - An \Array of Arrays, otherwise.
  #
  # The data source must be opened for reading.
  #
  # Without headers:
  #   string = "foo,0\nbar,1\nbaz,2\n"
  #   path = 't.csv'
  #   File.write(path, string)
  #   csv = CSV.open(path)
  #   csv.read # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
  #
  # With headers:
  #   string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   path = 't.csv'
  #   File.write(path, string)
  #   csv = CSV.open(path, headers: true)
  #   csv.read # => #<CSV::Table mode:col_or_row row_count:4>
  #
  # ---
  #
  # Raises an exception if the source is not opened for reading:
  #   string = "foo,0\nbar,1\nbaz,2\n"
  #   csv = CSV.new(string)
  #   csv.close
  #   # Raises IOError (not opened for reading)
  #   csv.read
  #
  # source://csv//lib/csv.rb#2738
  def readlines; end

  # source://csv//lib/csv.rb#2389
  def reopen(*args, **_arg1, &block); end

  # :call-seq:
  #   csv.return_headers? -> true or false
  #
  # Returns the value that determines whether headers are to be returned; used for parsing;
  # see {Option +return_headers+}[#class-CSV-label-Option+return_headers]:
  #   CSV.new('').return_headers? # => false
  #
  # @return [Boolean]
  #
  # source://csv//lib/csv.rb#2259
  def return_headers?; end

  # Rewinds the underlying IO object and resets CSV's lineno() counter.
  #
  # source://csv//lib/csv.rb#2447
  def rewind; end

  # :call-seq:
  #   csv.row_sep -> string
  #
  # Returns the encoded row separator; used for parsing and writing;
  # see {Option +row_sep+}[#class-CSV-label-Option+row_sep]:
  #   CSV.new('').row_sep # => "\n"
  #
  # source://csv//lib/csv.rb#2154
  def row_sep; end

  # source://csv//lib/csv.rb#2389
  def seek(*args, **_arg1, &block); end

  # :call-seq:
  #   csv.shift -> array, csv_row, or nil
  #
  # Returns the next row of data as:
  # - An \Array if no headers are used.
  # - A CSV::Row object if headers are used.
  #
  # The data source must be opened for reading.
  #
  # Without headers:
  #   string = "foo,0\nbar,1\nbaz,2\n"
  #   csv = CSV.new(string)
  #   csv.shift # => ["foo", "0"]
  #   csv.shift # => ["bar", "1"]
  #   csv.shift # => ["baz", "2"]
  #   csv.shift # => nil
  #
  # With headers:
  #   string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   csv = CSV.new(string, headers: true)
  #   csv.shift # => #<CSV::Row "Name":"foo" "Value":"0">
  #   csv.shift # => #<CSV::Row "Name":"bar" "Value":"1">
  #   csv.shift # => #<CSV::Row "Name":"baz" "Value":"2">
  #   csv.shift # => nil
  #
  # ---
  #
  # Raises an exception if the source is not opened for reading:
  #   string = "foo,0\nbar,1\nbaz,2\n"
  #   csv = CSV.new(string)
  #   csv.close
  #   # Raises IOError (not opened for reading)
  #   csv.shift
  #
  # source://csv//lib/csv.rb#2803
  def shift; end

  # :call-seq:
  #   csv.skip_blanks? -> true or false
  #
  # Returns the value that determines whether blank lines are to be ignored; used for parsing;
  # see {Option +skip_blanks+}[#class-CSV-label-Option+skip_blanks]:
  #   CSV.new('').skip_blanks? # => false
  #
  # @return [Boolean]
  #
  # source://csv//lib/csv.rb#2296
  def skip_blanks?; end

  # :call-seq:
  #   csv.skip_lines -> regexp or nil
  #
  # Returns the \Regexp used to identify comment lines; used for parsing;
  # see {Option +skip_lines+}[#class-CSV-label-Option+skip_lines]:
  #   CSV.new('').skip_lines # => nil
  #
  # source://csv//lib/csv.rb#2198
  def skip_lines; end

  # @raise [NotImplementedError]
  #
  # source://csv//lib/csv.rb#2418
  def stat(*args); end

  # source://csv//lib/csv.rb#2389
  def string(*args, **_arg1, &block); end

  # source://csv//lib/csv.rb#2389
  def sync(*args, **_arg1, &block); end

  # source://csv//lib/csv.rb#2389
  def sync=(*args, **_arg1, &block); end

  # source://csv//lib/csv.rb#2389
  def tell(*args, **_arg1, &block); end

  # @raise [NotImplementedError]
  #
  # source://csv//lib/csv.rb#2423
  def to_i; end

  # source://csv//lib/csv.rb#2428
  def to_io; end

  # source://csv//lib/csv.rb#2389
  def truncate(*args, **_arg1, &block); end

  # source://csv//lib/csv.rb#2389
  def tty?(*args, **_arg1, &block); end

  # :call-seq:
  #   csv.unconverted_fields? -> object
  #
  # Returns the value that determines whether unconverted fields are to be
  # available; used for parsing;
  # see {Option +unconverted_fields+}[#class-CSV-label-Option+unconverted_fields]:
  #   CSV.new('').unconverted_fields? # => nil
  #
  # @return [Boolean]
  #
  # source://csv//lib/csv.rb#2231
  def unconverted_fields?; end

  # :call-seq:
  #   csv.write_headers? -> true or false
  #
  # Returns the value that determines whether headers are to be written; used for generating;
  # see {Option +write_headers+}[#class-CSV-label-Option+write_headers]:
  #   CSV.new('').write_headers? # => nil
  #
  # @return [Boolean]
  #
  # source://csv//lib/csv.rb#2269
  def write_headers?; end

  private

  # source://csv//lib/csv.rb#2957
  def build_fields_converter(initial_converters, options); end

  # source://csv//lib/csv.rb#2939
  def build_header_fields_converter; end

  # source://csv//lib/csv.rb#2927
  def build_parser_fields_converter; end

  # source://csv//lib/csv.rb#2952
  def build_writer_fields_converter; end

  # Processes +fields+ with <tt>@converters</tt>, or <tt>@header_converters</tt>
  # if +headers+ is passed as +true+, returning the converted field set. Any
  # converter that changes the field into something other than a String halts
  # the pipeline of conversion for that field. This is primarily an efficiency
  # shortcut.
  #
  # source://csv//lib/csv.rb#2902
  def convert_fields(fields, headers = T.unsafe(nil)); end

  # source://csv//lib/csv.rb#2865
  def determine_encoding(encoding, internal_encoding); end

  # source://csv//lib/csv.rb#2935
  def header_fields_converter; end

  # source://csv//lib/csv.rb#2880
  def normalize_converters(converters); end

  # source://csv//lib/csv.rb#2965
  def parser; end

  # source://csv//lib/csv.rb#2974
  def parser_enumerator; end

  # source://csv//lib/csv.rb#2923
  def parser_fields_converter; end

  # source://csv//lib/csv.rb#2969
  def parser_options; end

  # Returns the encoding of the internal IO object.
  #
  # source://csv//lib/csv.rb#2913
  def raw_encoding; end

  # source://csv//lib/csv.rb#2978
  def writer; end

  # source://csv//lib/csv.rb#2948
  def writer_fields_converter; end

  # source://csv//lib/csv.rb#2982
  def writer_options; end

  class << self
    # :call-seq:
    #   filter(in_string_or_io, **options) {|row| ... } -> array_of_arrays or csv_table
    #   filter(in_string_or_io, out_string_or_io, **options) {|row| ... } -> array_of_arrays or csv_table
    #   filter(**options) {|row| ... } -> array_of_arrays or csv_table
    #
    # - Parses \CSV from a source (\String, \IO stream, or ARGF).
    # - Calls the given block with each parsed row:
    #   - Without headers, each row is an \Array.
    #   - With headers, each row is a CSV::Row.
    # - Generates \CSV to an output (\String, \IO stream, or STDOUT).
    # - Returns the parsed source:
    #   - Without headers, an \Array of \Arrays.
    #   - With headers, a CSV::Table.
    #
    # When +in_string_or_io+ is given, but not +out_string_or_io+,
    # parses from the given +in_string_or_io+
    # and generates to STDOUT.
    #
    # \String input without headers:
    #
    #   in_string = "foo,0\nbar,1\nbaz,2"
    #   CSV.filter(in_string) do |row|
    #     row[0].upcase!
    #     row[1] = - row[1].to_i
    #   end # => [["FOO", 0], ["BAR", -1], ["BAZ", -2]]
    #
    # Output (to STDOUT):
    #
    #   FOO,0
    #   BAR,-1
    #   BAZ,-2
    #
    # \String input with headers:
    #
    #   in_string = "Name,Value\nfoo,0\nbar,1\nbaz,2"
    #   CSV.filter(in_string, headers: true) do |row|
    #     row[0].upcase!
    #     row[1] = - row[1].to_i
    #   end # => #<CSV::Table mode:col_or_row row_count:4>
    #
    # Output (to STDOUT):
    #
    #   Name,Value
    #   FOO,0
    #   BAR,-1
    #   BAZ,-2
    #
    # \IO stream input without headers:
    #
    #   File.write('t.csv', "foo,0\nbar,1\nbaz,2")
    #   File.open('t.csv') do |in_io|
    #     CSV.filter(in_io) do |row|
    #       row[0].upcase!
    #       row[1] = - row[1].to_i
    #     end
    #   end # => [["FOO", 0], ["BAR", -1], ["BAZ", -2]]
    #
    # Output (to STDOUT):
    #
    #   FOO,0
    #   BAR,-1
    #   BAZ,-2
    #
    # \IO stream input with headers:
    #
    #   File.write('t.csv', "Name,Value\nfoo,0\nbar,1\nbaz,2")
    #   File.open('t.csv') do |in_io|
    #     CSV.filter(in_io, headers: true) do |row|
    #       row[0].upcase!
    #       row[1] = - row[1].to_i
    #     end
    #   end # => #<CSV::Table mode:col_or_row row_count:4>
    #
    # Output (to STDOUT):
    #
    #   Name,Value
    #   FOO,0
    #   BAR,-1
    #   BAZ,-2
    #
    # When both +in_string_or_io+ and +out_string_or_io+ are given,
    # parses from +in_string_or_io+ and generates to +out_string_or_io+.
    #
    # \String output without headers:
    #
    #   in_string = "foo,0\nbar,1\nbaz,2"
    #   out_string = ''
    #   CSV.filter(in_string, out_string) do |row|
    #     row[0].upcase!
    #     row[1] = - row[1].to_i
    #   end # => [["FOO", 0], ["BAR", -1], ["BAZ", -2]]
    #   out_string # => "FOO,0\nBAR,-1\nBAZ,-2\n"
    #
    # \String output with headers:
    #
    #   in_string = "Name,Value\nfoo,0\nbar,1\nbaz,2"
    #   out_string = ''
    #   CSV.filter(in_string, out_string, headers: true) do |row|
    #     row[0].upcase!
    #     row[1] = - row[1].to_i
    #   end # => #<CSV::Table mode:col_or_row row_count:4>
    #   out_string # => "Name,Value\nFOO,0\nBAR,-1\nBAZ,-2\n"
    #
    # \IO stream output without headers:
    #
    #   in_string = "foo,0\nbar,1\nbaz,2"
    #   File.open('t.csv', 'w') do |out_io|
    #     CSV.filter(in_string, out_io) do |row|
    #       row[0].upcase!
    #       row[1] = - row[1].to_i
    #     end
    #   end # => [["FOO", 0], ["BAR", -1], ["BAZ", -2]]
    #   File.read('t.csv') # => "FOO,0\nBAR,-1\nBAZ,-2\n"
    #
    # \IO stream output with headers:
    #
    #   in_string = "Name,Value\nfoo,0\nbar,1\nbaz,2"
    #   File.open('t.csv', 'w') do |out_io|
    #     CSV.filter(in_string, out_io, headers: true) do |row|
    #       row[0].upcase!
    #       row[1] = - row[1].to_i
    #     end
    #   end # => #<CSV::Table mode:col_or_row row_count:4>
    #   File.read('t.csv') # => "Name,Value\nFOO,0\nBAR,-1\nBAZ,-2\n"
    #
    # When neither +in_string_or_io+ nor +out_string_or_io+ given,
    # parses from {ARGF}[rdoc-ref:ARGF]
    # and generates to STDOUT.
    #
    # Without headers:
    #
    #   # Put Ruby code into a file.
    #   ruby = <<-EOT
    #     require 'csv'
    #     CSV.filter do |row|
    #       row[0].upcase!
    #       row[1] = - row[1].to_i
    #     end
    #   EOT
    #   File.write('t.rb', ruby)
    #   # Put some CSV into a file.
    #   File.write('t.csv', "foo,0\nbar,1\nbaz,2")
    #   # Run the Ruby code with CSV filename as argument.
    #   system(Gem.ruby, "t.rb", "t.csv")
    #
    # Output (to STDOUT):
    #
    #   FOO,0
    #   BAR,-1
    #   BAZ,-2
    #
    # With headers:
    #
    #   # Put Ruby code into a file.
    #   ruby = <<-EOT
    #     require 'csv'
    #     CSV.filter(headers: true) do |row|
    #       row[0].upcase!
    #       row[1] = - row[1].to_i
    #     end
    #   EOT
    #   File.write('t.rb', ruby)
    #   # Put some CSV into a file.
    #   File.write('t.csv', "Name,Value\nfoo,0\nbar,1\nbaz,2")
    #   # Run the Ruby code with CSV filename as argument.
    #   system(Gem.ruby, "t.rb", "t.csv")
    #
    # Output (to STDOUT):
    #
    #   Name,Value
    #   FOO,0
    #   BAR,-1
    #   BAZ,-2
    #
    # Arguments:
    #
    # * Argument +in_string_or_io+ must be a \String or an \IO stream.
    # * Argument +out_string_or_io+ must be a \String or an \IO stream.
    # * Arguments <tt>**options</tt> must be keyword options.
    #
    #   - Each option defined as an {option for parsing}[#class-CSV-label-Options+for+Parsing]
    #     is used for parsing the filter input.
    #   - Each option defined as an {option for generating}[#class-CSV-label-Options+for+Generating]
    #     is used for generator the filter input.
    #
    # However, there are three options that may be used for both parsing and generating:
    # +col_sep+, +quote_char+, and +row_sep+.
    #
    # Therefore for method +filter+ (and method +filter+ only),
    # there are special options that allow these parsing and generating options
    # to be specified separately:
    #
    # - Options +input_col_sep+ and +output_col_sep+
    #   (and their aliases +in_col_sep+ and +out_col_sep+)
    #   specify the column separators for parsing and generating.
    # - Options +input_quote_char+ and +output_quote_char+
    #   (and their aliases +in_quote_char+ and +out_quote_char+)
    #   specify the quote characters for parsing and generting.
    # - Options +input_row_sep+ and +output_row_sep+
    #   (and their aliases +in_row_sep+ and +out_row_sep+)
    #   specify the row separators for parsing and generating.
    #
    # Example options (for column separators):
    #
    #   CSV.filter                                    # Default for both parsing and generating.
    #   CSV.filter(in_col_sep: ';')                   # ';' for parsing, default for generating.
    #   CSV.filter(out_col_sep: '|')                  # Default for parsing, '|' for generating.
    #   CSV.filter(in_col_sep: ';', out_col_sep: '|') # ';' for parsing, '|' for generating.
    #
    # Note that for a special option (e.g., +input_col_sep+)
    # and its corresponding "regular" option (e.g., +col_sep+),
    # the two are mutually overriding.
    #
    # Another example (possibly surprising):
    #
    #   CSV.filter(in_col_sep: ';', col_sep: '|') # '|' for both parsing(!) and generating.
    #
    # source://csv//lib/csv.rb#1259
    def filter(input = T.unsafe(nil), output = T.unsafe(nil), **options); end

    # :call-seq:
    #   foreach(path_or_io, mode='r', **options) {|row| ... )
    #   foreach(path_or_io, mode='r', **options) -> new_enumerator
    #
    # Calls the block with each row read from source +path_or_io+.
    #
    # \Path input without headers:
    #
    #   string = "foo,0\nbar,1\nbaz,2\n"
    #   in_path = 't.csv'
    #   File.write(in_path, string)
    #   CSV.foreach(in_path) {|row| p row }
    #
    # Output:
    #
    #   ["foo", "0"]
    #   ["bar", "1"]
    #   ["baz", "2"]
    #
    # \Path input with headers:
    #
    #   string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
    #   in_path = 't.csv'
    #   File.write(in_path, string)
    #   CSV.foreach(in_path, headers: true) {|row| p row }
    #
    # Output:
    #
    #   <CSV::Row "Name":"foo" "Value":"0">
    #   <CSV::Row "Name":"bar" "Value":"1">
    #   <CSV::Row "Name":"baz" "Value":"2">
    #
    # \IO stream input without headers:
    #
    #   string = "foo,0\nbar,1\nbaz,2\n"
    #   path = 't.csv'
    #   File.write(path, string)
    #   File.open('t.csv') do |in_io|
    #     CSV.foreach(in_io) {|row| p row }
    #   end
    #
    # Output:
    #
    #   ["foo", "0"]
    #   ["bar", "1"]
    #   ["baz", "2"]
    #
    # \IO stream input with headers:
    #
    #   string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
    #   path = 't.csv'
    #   File.write(path, string)
    #   File.open('t.csv') do |in_io|
    #     CSV.foreach(in_io, headers: true) {|row| p row }
    #   end
    #
    # Output:
    #
    #   <CSV::Row "Name":"foo" "Value":"0">
    #   <CSV::Row "Name":"bar" "Value":"1">
    #   <CSV::Row "Name":"baz" "Value":"2">
    #
    # With no block given, returns an \Enumerator:
    #
    #   string = "foo,0\nbar,1\nbaz,2\n"
    #   path = 't.csv'
    #   File.write(path, string)
    #   CSV.foreach(path) # => #<Enumerator: CSV:foreach("t.csv", "r")>
    #
    # Arguments:
    # * Argument +path_or_io+ must be a file path or an \IO stream.
    # * Argument +mode+, if given, must be a \File mode.
    #   See {Access Modes}[https://docs.ruby-lang.org/en/master/File.html#class-File-label-Access+Modes].
    # * Arguments <tt>**options</tt> must be keyword options.
    #   See {Options for Parsing}[#class-CSV-label-Options+for+Parsing].
    # * This method optionally accepts an additional <tt>:encoding</tt> option
    #   that you can use to specify the Encoding of the data read from +path+ or +io+.
    #   You must provide this unless your data is in the encoding
    #   given by <tt>Encoding::default_external</tt>.
    #   Parsing will use this to determine how to parse the data.
    #   You may provide a second Encoding to
    #   have the data transcoded as it is read. For example,
    #   would read +UTF-32BE+ data from the file
    #   but transcode it to +UTF-8+ before parsing.
    #
    # source://csv//lib/csv.rb#1389
    def foreach(path, mode = T.unsafe(nil), **options, &block); end

    # :call-seq:
    #   generate(csv_string, **options) {|csv| ... }
    #   generate(**options) {|csv| ... }
    #
    # * Argument +csv_string+, if given, must be a \String object;
    #   defaults to a new empty \String.
    # * Arguments +options+, if given, should be generating options.
    #   See {Options for Generating}[#class-CSV-label-Options+for+Generating].
    #
    # ---
    #
    # Creates a new \CSV object via <tt>CSV.new(csv_string, **options)</tt>;
    # calls the block with the \CSV object, which the block may modify;
    # returns the \String generated from the \CSV object.
    #
    # Note that a passed \String *is* modified by this method.
    # Pass <tt>csv_string</tt>.dup if the \String must be preserved.
    #
    # This method has one additional option: <tt>:encoding</tt>,
    # which sets the base Encoding for the output if no no +str+ is specified.
    # CSV needs this hint if you plan to output non-ASCII compatible data.
    #
    # ---
    #
    # Add lines:
    #   input_string = "foo,0\nbar,1\nbaz,2\n"
    #   output_string = CSV.generate(input_string) do |csv|
    #     csv << ['bat', 3]
    #     csv << ['bam', 4]
    #   end
    #   output_string # => "foo,0\nbar,1\nbaz,2\nbat,3\nbam,4\n"
    #   input_string # => "foo,0\nbar,1\nbaz,2\nbat,3\nbam,4\n"
    #   output_string.equal?(input_string) # => true # Same string, modified
    #
    # Add lines into new string, preserving old string:
    #   input_string = "foo,0\nbar,1\nbaz,2\n"
    #   output_string = CSV.generate(input_string.dup) do |csv|
    #     csv << ['bat', 3]
    #     csv << ['bam', 4]
    #   end
    #   output_string # => "foo,0\nbar,1\nbaz,2\nbat,3\nbam,4\n"
    #   input_string # => "foo,0\nbar,1\nbaz,2\n"
    #   output_string.equal?(input_string) # => false # Different strings
    #
    # Create lines from nothing:
    #   output_string = CSV.generate do |csv|
    #     csv << ['foo', 0]
    #     csv << ['bar', 1]
    #     csv << ['baz', 2]
    #   end
    #   output_string # => "foo,0\nbar,1\nbaz,2\n"
    #
    # ---
    #
    # Raises an exception if +csv_string+ is not a \String object:
    #   # Raises TypeError (no implicit conversion of Integer into String)
    #   CSV.generate(0)
    #
    # @yield [csv]
    #
    # source://csv//lib/csv.rb#1455
    def generate(str = T.unsafe(nil), **options); end

    # :call-seq:
    #   CSV.generate_line(ary)
    #   CSV.generate_line(ary, **options)
    #
    # Returns the \String created by generating \CSV from +ary+
    # using the specified +options+.
    #
    # Argument +ary+ must be an \Array.
    #
    # Special options:
    # * Option <tt>:row_sep</tt> defaults to <tt>"\n"> on Ruby 3.0 or later
    #   and <tt>$INPUT_RECORD_SEPARATOR</tt> (<tt>$/</tt>) otherwise.:
    #     $INPUT_RECORD_SEPARATOR # => "\n"
    # * This method accepts an additional option, <tt>:encoding</tt>, which sets the base
    #   Encoding for the output. This method will try to guess your Encoding from
    #   the first non-+nil+ field in +row+, if possible, but you may need to use
    #   this parameter as a backup plan.
    #
    # For other +options+,
    # see {Options for Generating}[#class-CSV-label-Options+for+Generating].
    #
    # ---
    #
    # Returns the \String generated from an \Array:
    #   CSV.generate_line(['foo', '0']) # => "foo,0\n"
    #
    # ---
    #
    # Raises an exception if +ary+ is not an \Array:
    #   # Raises NoMethodError (undefined method `find' for :foo:Symbol)
    #   CSV.generate_line(:foo)
    #
    # source://csv//lib/csv.rb#1503
    def generate_line(row, **options); end

    # :call-seq:
    #   CSV.generate_lines(rows)
    #   CSV.generate_lines(rows, **options)
    #
    # Returns the \String created by generating \CSV from
    # using the specified +options+.
    #
    # Argument +rows+ must be an \Array of row. Row is \Array of \String or \CSV::Row.
    #
    # Special options:
    # * Option <tt>:row_sep</tt> defaults to <tt>"\n"</tt> on Ruby 3.0 or later
    #   and <tt>$INPUT_RECORD_SEPARATOR</tt> (<tt>$/</tt>) otherwise.:
    #     $INPUT_RECORD_SEPARATOR # => "\n"
    # * This method accepts an additional option, <tt>:encoding</tt>, which sets the base
    #   Encoding for the output. This method will try to guess your Encoding from
    #   the first non-+nil+ field in +row+, if possible, but you may need to use
    #   this parameter as a backup plan.
    #
    # For other +options+,
    # see {Options for Generating}[#class-CSV-label-Options+for+Generating].
    #
    # ---
    #
    # Returns the \String generated from an
    #   CSV.generate_lines([['foo', '0'], ['bar', '1'], ['baz', '2']]) # => "foo,0\nbar,1\nbaz,2\n"
    #
    # ---
    #
    # Raises an exception
    #   # Raises NoMethodError (undefined method `each' for :foo:Symbol)
    #   CSV.generate_lines(:foo)
    #
    # source://csv//lib/csv.rb#1558
    def generate_lines(rows, **options); end

    # :call-seq:
    #   instance(string, **options)
    #   instance(io = $stdout, **options)
    #   instance(string, **options) {|csv| ... }
    #   instance(io = $stdout, **options) {|csv| ... }
    #
    # Creates or retrieves cached \CSV objects.
    # For arguments and options, see CSV.new.
    #
    # This API is not Ractor-safe.
    #
    # ---
    #
    # With no block given, returns a \CSV object.
    #
    # The first call to +instance+ creates and caches a \CSV object:
    #   s0 = 's0'
    #   csv0 = CSV.instance(s0)
    #   csv0.class # => CSV
    #
    # Subsequent calls to +instance+ with that _same_ +string+ or +io+
    # retrieve that same cached object:
    #   csv1 = CSV.instance(s0)
    #   csv1.class # => CSV
    #   csv1.equal?(csv0) # => true # Same CSV object
    #
    # A subsequent call to +instance+ with a _different_ +string+ or +io+
    # creates and caches a _different_ \CSV object.
    #   s1 = 's1'
    #   csv2 = CSV.instance(s1)
    #   csv2.equal?(csv0) # => false # Different CSV object
    #
    # All the cached objects remains available:
    #   csv3 = CSV.instance(s0)
    #   csv3.equal?(csv0) # true # Same CSV object
    #   csv4 = CSV.instance(s1)
    #   csv4.equal?(csv2) # true # Same CSV object
    #
    # ---
    #
    # When a block is given, calls the block with the created or retrieved
    # \CSV object; returns the block's return value:
    #   CSV.instance(s0) {|csv| :foo } # => :foo
    #
    # source://csv//lib/csv.rb#1026
    def instance(data = T.unsafe(nil), **options); end

    # :call-seq:
    #   open(path_or_io, mode = "rb", **options ) -> new_csv
    #   open(path_or_io, mode = "rb", **options ) { |csv| ... } -> object
    #
    # possible options elements:
    #   keyword form:
    #     :invalid => nil      # raise error on invalid byte sequence (default)
    #     :invalid => :replace # replace invalid byte sequence
    #     :undef => :replace   # replace undefined conversion
    #     :replace => string   # replacement string ("?" or "\uFFFD" if not specified)
    #
    # * Argument +path_or_io+, must be a file path or an \IO stream.
    # :include: ../doc/csv/arguments/io.rdoc
    # * Argument +mode+, if given, must be a \File mode.
    #   See {Access Modes}[https://docs.ruby-lang.org/en/master/File.html#class-File-label-Access+Modes].
    # * Arguments <tt>**options</tt> must be keyword options.
    #   See {Options for Generating}[#class-CSV-label-Options+for+Generating].
    # * This method optionally accepts an additional <tt>:encoding</tt> option
    #   that you can use to specify the Encoding of the data read from +path+ or +io+.
    #   You must provide this unless your data is in the encoding
    #   given by <tt>Encoding::default_external</tt>.
    #   Parsing will use this to determine how to parse the data.
    #   You may provide a second Encoding to
    #   have the data transcoded as it is read. For example,
    #   would read +UTF-32BE+ data from the file
    #   but transcode it to +UTF-8+ before parsing.
    #
    # ---
    #
    # These examples assume prior execution of:
    #   string = "foo,0\nbar,1\nbaz,2\n"
    #   path = 't.csv'
    #   File.write(path, string)
    #
    #   string_io = StringIO.new
    #   string_io << "foo,0\nbar,1\nbaz,2\n"
    #
    # ---
    #
    # With no block given, returns a new \CSV object.
    #
    # Create a \CSV object using a file path:
    #   csv = CSV.open(path)
    #
    # Create a \CSV object using an open \File:
    #   csv = CSV.open(File.open(path))
    #
    # Create a \CSV object using a \StringIO:
    #   csv = CSV.open(string_io)
    # ---
    #
    # With a block given, calls the block with the created \CSV object;
    # returns the block's return value:
    #
    # Using a file path:
    #   csv = CSV.open(path) {|csv| p csv}
    # Output:
    #
    # Using an open \File:
    #   csv = CSV.open(File.open(path)) {|csv| p csv}
    # Output:
    #
    # Using a \StringIO:
    #   csv = CSV.open(string_io) {|csv| p csv}
    # Output:
    # ---
    #
    # Raises an exception if the argument is not a \String object or \IO object:
    #   # Raises TypeError (no implicit conversion of Symbol into String)
    #   CSV.open(:foo)
    #
    # source://csv//lib/csv.rb#1647
    def open(filename_or_io, mode = T.unsafe(nil), **options); end

    # :call-seq:
    #   parse(string) -> array_of_arrays
    #   parse(io) -> array_of_arrays
    #   parse(string, headers: ..., **options) -> csv_table
    #   parse(io, headers: ..., **options) -> csv_table
    #   parse(string, **options) {|row| ... }
    #   parse(io, **options) {|row| ... }
    #
    # Parses +string+ or +io+ using the specified +options+.
    #
    # - Argument +string+ should be a \String object;
    #   it will be put into a new StringIO object positioned at the beginning.
    # :include: ../doc/csv/arguments/io.rdoc
    # - Argument +options+: see {Options for Parsing}[#class-CSV-label-Options+for+Parsing]
    #
    # ====== Without Option +headers+
    #
    # Without {option +headers+}[#class-CSV-label-Option+headers] case.
    #
    # These examples assume prior execution of:
    #   string = "foo,0\nbar,1\nbaz,2\n"
    #   path = 't.csv'
    #   File.write(path, string)
    #
    # ---
    #
    # With no block given, returns an \Array of Arrays formed from the source.
    #
    # Parse a \String:
    #   a_of_a = CSV.parse(string)
    #   a_of_a # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
    #
    # Parse an open \File:
    #   a_of_a = File.open(path) do |file|
    #     CSV.parse(file)
    #   end
    #   a_of_a # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
    #
    # ---
    #
    # With a block given, calls the block with each parsed row:
    #
    # Parse a \String:
    #   CSV.parse(string) {|row| p row }
    #
    # Output:
    #   ["foo", "0"]
    #   ["bar", "1"]
    #   ["baz", "2"]
    #
    # Parse an open \File:
    #   File.open(path) do |file|
    #     CSV.parse(file) {|row| p row }
    #   end
    #
    # Output:
    #   ["foo", "0"]
    #   ["bar", "1"]
    #   ["baz", "2"]
    #
    # ====== With Option +headers+
    #
    # With {option +headers+}[#class-CSV-label-Option+headers] case.
    #
    # These examples assume prior execution of:
    #   string = "Name,Count\nfoo,0\nbar,1\nbaz,2\n"
    #   path = 't.csv'
    #   File.write(path, string)
    #
    # ---
    #
    # With no block given, returns a CSV::Table object formed from the source.
    #
    # Parse a \String:
    #   csv_table = CSV.parse(string, headers: ['Name', 'Count'])
    #   csv_table # => #<CSV::Table mode:col_or_row row_count:5>
    #
    # Parse an open \File:
    #   csv_table = File.open(path) do |file|
    #     CSV.parse(file, headers: ['Name', 'Count'])
    #   end
    #   csv_table # => #<CSV::Table mode:col_or_row row_count:4>
    #
    # ---
    #
    # With a block given, calls the block with each parsed row,
    # which has been formed into a CSV::Row object:
    #
    # Parse a \String:
    #   CSV.parse(string, headers: ['Name', 'Count']) {|row| p row }
    #
    # Output:
    #   # <CSV::Row "Name":"foo" "Count":"0">
    #   # <CSV::Row "Name":"bar" "Count":"1">
    #   # <CSV::Row "Name":"baz" "Count":"2">
    #
    # Parse an open \File:
    #   File.open(path) do |file|
    #     CSV.parse(file, headers: ['Name', 'Count']) {|row| p row }
    #   end
    #
    # Output:
    #   # <CSV::Row "Name":"foo" "Count":"0">
    #   # <CSV::Row "Name":"bar" "Count":"1">
    #   # <CSV::Row "Name":"baz" "Count":"2">
    #
    # ---
    #
    # Raises an exception if the argument is not a \String object or \IO object:
    #   # Raises NoMethodError (undefined method `close' for :foo:Symbol)
    #   CSV.parse(:foo)
    #
    # ---
    #
    # Please make sure if your text contains \BOM or not. CSV.parse will not remove
    # \BOM automatically. You might want to remove \BOM before calling CSV.parse :
    #   # remove BOM on calling File.open
    #     CSV.parse(file, headers: true) do |row|
    #       # you can get value by column name because BOM is removed
    #       p row['Name']
    #     end
    #   end
    #
    # Output:
    #   # "foo"
    #   # "bar"
    #   # "baz"
    #
    # source://csv//lib/csv.rb#1825
    def parse(str, **options, &block); end

    # :call-seq:
    #   CSV.parse_line(string) -> new_array or nil
    #   CSV.parse_line(io) -> new_array or nil
    #   CSV.parse_line(string, **options) -> new_array or nil
    #   CSV.parse_line(io, **options) -> new_array or nil
    #   CSV.parse_line(string, headers: true, **options) -> csv_row or nil
    #   CSV.parse_line(io, headers: true, **options) -> csv_row or nil
    #
    # Returns the data created by parsing the first line of +string+ or +io+
    # using the specified +options+.
    #
    # - Argument +string+ should be a \String object;
    #   it will be put into a new StringIO object positioned at the beginning.
    # :include: ../doc/csv/arguments/io.rdoc
    # - Argument +options+: see {Options for Parsing}[#class-CSV-label-Options+for+Parsing]
    #
    # ====== Without Option +headers+
    #
    # Without option +headers+, returns the first row as a new \Array.
    #
    # These examples assume prior execution of:
    #   string = "foo,0\nbar,1\nbaz,2\n"
    #   path = 't.csv'
    #   File.write(path, string)
    #
    # Parse the first line from a \String object:
    #   CSV.parse_line(string) # => ["foo", "0"]
    #
    # Parse the first line from a File object:
    #   File.open(path) do |file|
    #     CSV.parse_line(file) # => ["foo", "0"]
    #   end # => ["foo", "0"]
    #
    # Returns +nil+ if the argument is an empty \String:
    #   CSV.parse_line('') # => nil
    #
    # ====== With Option +headers+
    #
    # With {option +headers+}[#class-CSV-label-Option+headers],
    # returns the first row as a CSV::Row object.
    #
    # These examples assume prior execution of:
    #   string = "Name,Count\nfoo,0\nbar,1\nbaz,2\n"
    #   path = 't.csv'
    #   File.write(path, string)
    #
    # Parse the first line from a \String object:
    #   CSV.parse_line(string, headers: true) # => #<CSV::Row "Name":"foo" "Count":"0">
    #
    # Parse the first line from a File object:
    #   File.open(path) do |file|
    #     CSV.parse_line(file, headers: true)
    #   end # => #<CSV::Row "Name":"foo" "Count":"0">
    #
    # ---
    #
    # Raises an exception if the argument is +nil+:
    #   # Raises ArgumentError (Cannot parse nil as CSV):
    #   CSV.parse_line(nil)
    #
    # source://csv//lib/csv.rb#1898
    def parse_line(line, **options); end

    # :call-seq:
    #   read(source, **options) -> array_of_arrays
    #   read(source, headers: true, **options) -> csv_table
    #
    # Opens the given +source+ with the given +options+ (see CSV.open),
    # reads the source (see CSV#read), and returns the result,
    # which will be either an \Array of Arrays or a CSV::Table.
    #
    # Without headers:
    #   string = "foo,0\nbar,1\nbaz,2\n"
    #   path = 't.csv'
    #   File.write(path, string)
    #   CSV.read(path) # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
    #
    # With headers:
    #   string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
    #   path = 't.csv'
    #   File.write(path, string)
    #   CSV.read(path, headers: true) # => #<CSV::Table mode:col_or_row row_count:4>
    #
    # source://csv//lib/csv.rb#1922
    def read(path, **options); end

    # :call-seq:
    #   CSV.readlines(source, **options)
    #
    # Alias for CSV.read.
    #
    # source://csv//lib/csv.rb#1930
    def readlines(path, **options); end

    # :call-seq:
    #   CSV.table(source, **options)
    #
    # Calls CSV.read with +source+, +options+, and certain default options:
    # - +headers+: +true+
    # - +converters+: +:numeric+
    # - +header_converters+: +:symbol+
    #
    # Returns a CSV::Table object.
    #
    # Example:
    #   string = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
    #   path = 't.csv'
    #   File.write(path, string)
    #   CSV.table(path) # => #<CSV::Table mode:col_or_row row_count:4>
    #
    # source://csv//lib/csv.rb#1949
    def table(path, **options); end

    private

    # source://csv//lib/csv.rb#1990
    def create_stringio(str, mode, opts); end

    # source://csv//lib/csv.rb#1963
    def may_enable_bom_detection_automatically(filename_or_io, mode, options, file_opts); end
  end
end

# The encoding used by all converters.
#
# source://csv//lib/csv.rb#895
CSV::ConverterEncoding = T.let(T.unsafe(nil), Encoding)

# A Regexp used to find and convert some common Date formats.
#
# source://csv//lib/csv.rb#884
CSV::DateMatcher = T.let(T.unsafe(nil), Regexp)

# A Regexp used to find and convert some common (Date)Time formats.
#
# source://csv//lib/csv.rb#887
CSV::DateTimeMatcher = T.let(T.unsafe(nil), Regexp)

# A FieldInfo Struct contains details about a field's position in the data
# source it was read from.  CSV will pass this Struct to some blocks that make
# decisions based on field structure.  See CSV.convert_fields() for an
# example.
#
# <b><tt>index</tt></b>::  The zero-based index of the field in its row.
# <b><tt>line</tt></b>::   The line of the data source this row is from.
# <b><tt>header</tt></b>:: The header for the column, when available.
# <b><tt>quoted?</tt></b>:: True or false, whether the original value is quoted or not.
#
# source://csv//lib/csv.rb#881
class CSV::FieldInfo < ::Struct
  # Returns the value of attribute header
  #
  # @return [Object] the current value of header
  #
  # source://csv//lib/csv.rb#881
  def header; end

  # Sets the attribute header
  #
  # @param value [Object] the value to set the attribute header to.
  # @return [Object] the newly set value
  #
  # source://csv//lib/csv.rb#881
  def header=(_); end

  # Returns the value of attribute index
  #
  # @return [Object] the current value of index
  #
  # source://csv//lib/csv.rb#881
  def index; end

  # Sets the attribute index
  #
  # @param value [Object] the value to set the attribute index to.
  # @return [Object] the newly set value
  #
  # source://csv//lib/csv.rb#881
  def index=(_); end

  # Returns the value of attribute line
  #
  # @return [Object] the current value of line
  #
  # source://csv//lib/csv.rb#881
  def line; end

  # Sets the attribute line
  #
  # @param value [Object] the value to set the attribute line to.
  # @return [Object] the newly set value
  #
  # source://csv//lib/csv.rb#881
  def line=(_); end

  # Returns the value of attribute quoted?
  #
  # @return [Object] the current value of quoted?
  #
  # source://csv//lib/csv.rb#881
  def quoted?; end

  class << self
    # source://csv//lib/csv.rb#881
    def [](*_arg0); end

    # source://csv//lib/csv.rb#881
    def inspect; end

    # source://csv//lib/csv.rb#881
    def keyword_init?; end

    # source://csv//lib/csv.rb#881
    def members; end

    # source://csv//lib/csv.rb#881
    def new(*_arg0); end
  end
end

# Note: Don't use this class directly. This is an internal class.
#
# source://csv//lib/csv/fields_converter.rb#5
class CSV::FieldsConverter
  include ::Enumerable

  # A CSV::FieldsConverter is a data structure for storing the
  # fields converter properties to be passed as a parameter
  # when parsing a new file (e.g. CSV::Parser.new(@io, parser_options))
  #
  # @return [FieldsConverter] a new instance of FieldsConverter
  #
  # source://csv//lib/csv/fields_converter.rb#20
  def initialize(options = T.unsafe(nil)); end

  # source://csv//lib/csv/fields_converter.rb#30
  def add_converter(name = T.unsafe(nil), &converter); end

  # source://csv//lib/csv/fields_converter.rb#54
  def convert(fields, headers, lineno, quoted_fields = T.unsafe(nil)); end

  # source://csv//lib/csv/fields_converter.rb#46
  def each(&block); end

  # @return [Boolean]
  #
  # source://csv//lib/csv/fields_converter.rb#50
  def empty?; end

  private

  # source://csv//lib/csv/fields_converter.rb#92
  def builtin_converters; end

  # @return [Boolean]
  #
  # source://csv//lib/csv/fields_converter.rb#87
  def need_convert?; end

  # @return [Boolean]
  #
  # source://csv//lib/csv/fields_converter.rb#83
  def need_static_convert?; end
end

# source://csv//lib/csv/fields_converter.rb#8
CSV::FieldsConverter::NO_QUOTED_FIELDS = T.let(T.unsafe(nil), Array)

# A \Hash containing the names and \Procs for the built-in header converters.
# See {Built-In Header Converters}[#class-CSV-label-Built-In+Header+Converters].
#
# This \Hash is intentionally left unfrozen, and may be extended with
# custom field converters.
# See {Custom Header Converters}[#class-CSV-label-Custom+Header+Converters].
#
# source://csv//lib/csv.rb#944
CSV::HeaderConverters = T.let(T.unsafe(nil), Hash)

# source://csv//lib/csv/input_record_separator.rb#5
module CSV::InputRecordSeparator
  class << self
    # source://csv//lib/csv/input_record_separator.rb#8
    def value; end
  end
end

# The error thrown when the parser encounters invalid encoding in CSV.
#
# source://csv//lib/csv.rb#862
class CSV::InvalidEncodingError < ::CSV::MalformedCSVError
  # @return [InvalidEncodingError] a new instance of InvalidEncodingError
  #
  # source://csv//lib/csv.rb#864
  def initialize(encoding, line_number); end

  # Returns the value of attribute encoding.
  #
  # source://csv//lib/csv.rb#863
  def encoding; end
end

# The error thrown when the parser encounters illegal CSV formatting.
#
# source://csv//lib/csv.rb#852
class CSV::MalformedCSVError < ::RuntimeError
  # @return [MalformedCSVError] a new instance of MalformedCSVError
  #
  # source://csv//lib/csv.rb#855
  def initialize(message, line_number); end

  # Returns the value of attribute line_number.
  #
  # source://csv//lib/csv.rb#853
  def line_number; end

  # Returns the value of attribute line_number.
  #
  # source://csv//lib/csv.rb#854
  def lineno; end
end

# Note: Don't use this class directly. This is an internal class.
#
# source://csv//lib/csv/parser.rb#11
class CSV::Parser
  # @return [Parser] a new instance of Parser
  #
  # source://csv//lib/csv/parser.rb#348
  def initialize(input, options); end

  # source://csv//lib/csv/parser.rb#356
  def column_separator; end

  # source://csv//lib/csv/parser.rb#368
  def field_size_limit; end

  # @return [Boolean]
  #
  # source://csv//lib/csv/parser.rb#388
  def header_row?; end

  # source://csv//lib/csv/parser.rb#384
  def headers; end

  # @return [Boolean]
  #
  # source://csv//lib/csv/parser.rb#400
  def liberal_parsing?; end

  # source://csv//lib/csv/parser.rb#408
  def line; end

  # source://csv//lib/csv/parser.rb#404
  def lineno; end

  # source://csv//lib/csv/parser.rb#372
  def max_field_size; end

  # source://csv//lib/csv/parser.rb#412
  def parse(&block); end

  # source://csv//lib/csv/parser.rb#364
  def quote_character; end

  # @return [Boolean]
  #
  # source://csv//lib/csv/parser.rb#392
  def return_headers?; end

  # source://csv//lib/csv/parser.rb#360
  def row_separator; end

  # @return [Boolean]
  #
  # source://csv//lib/csv/parser.rb#396
  def skip_blanks?; end

  # source://csv//lib/csv/parser.rb#376
  def skip_lines; end

  # @return [Boolean]
  #
  # source://csv//lib/csv/parser.rb#380
  def unconverted_fields?; end

  # @return [Boolean]
  #
  # source://csv//lib/csv/parser.rb#447
  def use_headers?; end

  private

  # This method injects an instance variable <tt>unconverted_fields</tt> into
  # +row+ and an accessor method for +row+ called unconverted_fields().  The
  # variable is set to the contents of +fields+.
  #
  # source://csv//lib/csv/parser.rb#1294
  def add_unconverted_fields(row, fields); end

  # source://csv//lib/csv/parser.rb#806
  def adjust_headers(headers, quoted_fields); end

  # source://csv//lib/csv/parser.rb#881
  def build_scanner; end

  # source://csv//lib/csv/parser.rb#728
  def detect_row_separator(sample, cr, lf); end

  # @yield [row]
  #
  # source://csv//lib/csv/parser.rb#1265
  def emit_row(row, quoted_fields = T.unsafe(nil), &block); end

  # source://csv//lib/csv/parser.rb#1250
  def ignore_broken_line; end

  # source://csv//lib/csv/parser.rb#758
  def last_line; end

  # @return [Boolean]
  #
  # source://csv//lib/csv/parser.rb#823
  def may_quoted?; end

  # source://csv//lib/csv/parser.rb#1205
  def parse_column_end; end

  # source://csv//lib/csv/parser.rb#1105
  def parse_column_value; end

  # source://csv//lib/csv/parser.rb#792
  def parse_headers(row); end

  # source://csv//lib/csv/parser.rb#945
  def parse_no_quote(&block); end

  # source://csv//lib/csv/parser.rb#974
  def parse_quotable_loose(&block); end

  # source://csv//lib/csv/parser.rb#1035
  def parse_quotable_robust(&block); end

  # source://csv//lib/csv/parser.rb#1163
  def parse_quoted_column_value; end

  # source://csv//lib/csv/parser.rb#1219
  def parse_row_end; end

  # source://csv//lib/csv/parser.rb#1135
  def parse_unquoted_column_value; end

  # A set of tasks to prepare the file in order to parse it
  #
  # source://csv//lib/csv/parser.rb#453
  def prepare; end

  # source://csv//lib/csv/parser.rb#508
  def prepare_backslash; end

  # source://csv//lib/csv/parser.rb#766
  def prepare_header; end

  # source://csv//lib/csv/parser.rb#752
  def prepare_line; end

  # source://csv//lib/csv/parser.rb#812
  def prepare_parser; end

  # source://csv//lib/csv/parser.rb#492
  def prepare_quote_character; end

  # source://csv//lib/csv/parser.rb#648
  def prepare_quoted; end

  # source://csv//lib/csv/parser.rb#580
  def prepare_separators; end

  # source://csv//lib/csv/parser.rb#523
  def prepare_skip_lines; end

  # source://csv//lib/csv/parser.rb#540
  def prepare_strip; end

  # source://csv//lib/csv/parser.rb#675
  def prepare_unquoted; end

  # source://csv//lib/csv/parser.rb#468
  def prepare_variable; end

  # source://csv//lib/csv/parser.rb#688
  def resolve_row_separator(separator); end

  # @return [Boolean]
  #
  # source://csv//lib/csv/parser.rb#925
  def skip_line?(line); end

  # source://csv//lib/csv/parser.rb#908
  def skip_needless_lines; end

  # source://csv//lib/csv/parser.rb#1256
  def start_row; end

  # source://csv//lib/csv/parser.rb#1232
  def strip_value(value); end

  # @raise [MalformedCSVError]
  #
  # source://csv//lib/csv/parser.rb#937
  def validate_field_size(field); end

  # This method verifies that there are no (obvious) ambiguities with the
  # provided +col_sep+ and +strip+ parsing options. For example, if +col_sep+
  # and +strip+ were both equal to +\t+, then there would be no clear way to
  # parse the input.
  #
  # source://csv//lib/csv/parser.rb#630
  def validate_strip_and_col_sep_options; end

  class << self
    # Convenient method to check whether the give input reached EOF
    # or not.
    #
    # @return [Boolean]
    #
    # source://csv//lib/csv/parser.rb#25
    def eof?(input); end
  end
end

# CSV::InputsScanner receives IO inputs, encoding and the chunk_size.
# It also controls the life cycle of the object with its methods +keep_start+,
# +keep_end+, +keep_back+, +keep_drop+.
#
# CSV::InputsScanner.scan() tries to match with pattern at the current position.
# If there's a match, the scanner advances the "scan pointer" and returns the matched string.
# Otherwise, the scanner returns nil.
#
# CSV::InputsScanner.rest() returns the "rest" of the string (i.e. everything after the scan pointer).
# If there is no more data (eos? = true), it returns "".
#
# source://csv//lib/csv/parser.rb#99
class CSV::Parser::InputsScanner
  # @return [InputsScanner] a new instance of InputsScanner
  #
  # source://csv//lib/csv/parser.rb#100
  def initialize(inputs, encoding, row_separator, chunk_size: T.unsafe(nil)); end

  # source://csv//lib/csv/parser.rb#270
  def check(pattern); end

  # @yield [buffer]
  #
  # source://csv//lib/csv/parser.rb#110
  def each_line(row_separator); end

  # @return [Boolean]
  #
  # source://csv//lib/csv/parser.rb#183
  def eos?; end

  # source://csv//lib/csv/parser.rb#210
  def keep_back; end

  # source://csv//lib/csv/parser.rb#249
  def keep_drop; end

  # source://csv//lib/csv/parser.rb#194
  def keep_end; end

  # source://csv//lib/csv/parser.rb#187
  def keep_start; end

  # source://csv//lib/csv/parser.rb#266
  def rest; end

  # source://csv//lib/csv/parser.rb#156
  def scan(pattern); end

  # source://csv//lib/csv/parser.rb#167
  def scan_all(pattern); end

  private

  # source://csv//lib/csv/parser.rb#279
  def adjust_last_keep; end

  # source://csv//lib/csv/parser.rb#307
  def read_chunk; end

  # source://csv//lib/csv/parser.rb#275
  def trace(*args); end
end

# Raised when encoding is invalid.
#
# source://csv//lib/csv/parser.rb#35
class CSV::Parser::InvalidEncoding < ::StandardError; end

# source://csv//lib/csv/parser.rb#855
CSV::Parser::SCANNER_TEST = T.let(T.unsafe(nil), FalseClass)

# source://csv//lib/csv/parser.rb#577
CSV::Parser::STRING_SCANNER_SCAN_ACCEPT_STRING = T.let(T.unsafe(nil), TrueClass)

# CSV::Scanner receives a CSV output, scans it and return the content.
# It also controls the life cycle of the object with its methods +keep_start+,
# +keep_end+, +keep_back+, +keep_drop+.
#
# Uses StringScanner (the official strscan gem). Strscan provides lexical
# scanning operations on a String. We inherit its object and take advantage
# on the methods. For more information, please visit:
# https://docs.ruby-lang.org/en/master/StringScanner.html
#
# source://csv//lib/csv/parser.rb#52
class CSV::Parser::Scanner < ::StringScanner
  # @return [Scanner] a new instance of Scanner
  #
  # source://csv//lib/csv/parser.rb#55
  def initialize(*args); end

  # source://csv//lib/csv/parser.rb#60
  def each_line(row_separator); end

  # source://csv//lib/csv/parser.rb#78
  def keep_back; end

  # source://csv//lib/csv/parser.rb#82
  def keep_drop; end

  # source://csv//lib/csv/parser.rb#73
  def keep_end; end

  # source://csv//lib/csv/parser.rb#69
  def keep_start; end

  # source://csv//lib/csv/parser.rb#53
  def scan_all(_arg0); end
end

# Raised when unexpected case is happen.
#
# source://csv//lib/csv/parser.rb#39
class CSV::Parser::UnexpectedError < ::StandardError; end

# source://csv//lib/csv/parser.rb#837
class CSV::Parser::UnoptimizedStringIO
  # @return [UnoptimizedStringIO] a new instance of UnoptimizedStringIO
  #
  # source://csv//lib/csv/parser.rb#838
  def initialize(string); end

  # source://csv//lib/csv/parser.rb#846
  def each_line(*args, &block); end

  # @return [Boolean]
  #
  # source://csv//lib/csv/parser.rb#850
  def eof?; end

  # source://csv//lib/csv/parser.rb#842
  def gets(*args); end
end

# = \CSV::Row
# A \CSV::Row instance represents a \CSV table row.
# (see {class CSV}[../CSV.html]).
#
# The instance may have:
# - Fields: each is an object, not necessarily a \String.
# - Headers: each serves a key, and also need not be a \String.
#
# === Instance Methods
#
# \CSV::Row has three groups of instance methods:
# - Its own internally defined instance methods.
# - Methods included by module Enumerable.
# - Methods delegated to class Array.:
#   * Array#empty?
#   * Array#length
#   * Array#size
#
# == Creating a \CSV::Row Instance
#
# Commonly, a new \CSV::Row instance is created by parsing \CSV source
# that has headers:
#   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
#   table = CSV.parse(source, headers: true)
#   table.each {|row| p row }
# Output:
#   #<CSV::Row "Name":"foo" "Value":"0">
#   #<CSV::Row "Name":"bar" "Value":"1">
#   #<CSV::Row "Name":"baz" "Value":"2">
#
# You can also create a row directly. See ::new.
#
# == Headers
#
# Like a \CSV::Table, a \CSV::Row has headers.
#
# A \CSV::Row that was created by parsing \CSV source
# inherits its headers from the table:
#   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
#   table = CSV.parse(source, headers: true)
#   row = table.first
#   row.headers # => ["Name", "Value"]
#
# You can also create a new row with headers;
# like the keys in a \Hash, the headers need not be Strings:
#   row = CSV::Row.new([:name, :value], ['foo', 0])
#   row.headers # => [:name, :value]
#
# The new row retains its headers even if added to a table
# that has headers:
#   table << row # => #<CSV::Table mode:col_or_row row_count:5>
#   row.headers # => [:name, :value]
#   row[:name] # => "foo"
#   row['Name'] # => nil
#
#
#
# == Accessing Fields
#
# You may access a field in a \CSV::Row with either its \Integer index
# (\Array-style) or its header (\Hash-style).
#
# Fetch a field using method #[]:
#   row = CSV::Row.new(['Name', 'Value'], ['foo', 0])
#   row[1] # => 0
#   row['Value'] # => 0
#
# Set a field using method #[]=:
#   row = CSV::Row.new(['Name', 'Value'], ['foo', 0])
#   row # => #<CSV::Row "Name":"foo" "Value":0>
#   row[0] = 'bar'
#   row['Value'] = 1
#   row # => #<CSV::Row "Name":"bar" "Value":1>
#
# source://csv//lib/csv/row.rb#80
class CSV::Row
  include ::Enumerable
  extend ::Forwardable

  # :call-seq:
  #   CSV::Row.new(headers, fields, header_row = false) -> csv_row
  #
  # Returns the new \CSV::Row instance constructed from
  # arguments +headers+ and +fields+; both should be Arrays;
  # note that the fields need not be Strings:
  #   row = CSV::Row.new(['Name', 'Value'], ['foo', 0])
  #   row # => #<CSV::Row "Name":"foo" "Value":0>
  #
  # If the \Array lengths are different, the shorter is +nil+-filled:
  #   row = CSV::Row.new(['Name', 'Value', 'Date', 'Size'], ['foo', 0])
  #   row # => #<CSV::Row "Name":"foo" "Value":0 "Date":nil "Size":nil>
  #
  # Each \CSV::Row object is either a <i>field row</i> or a <i>header row</i>;
  # by default, a new row is a field row;  for the row created above:
  #   row.field_row? # => true
  #   row.header_row? # => false
  #
  # If the optional argument +header_row+ is given as +true+,
  # the created row is a header row:
  #   row = CSV::Row.new(['Name', 'Value'], ['foo', 0], header_row = true)
  #   row # => #<CSV::Row "Name":"foo" "Value":0>
  #   row.field_row? # => false
  #   row.header_row? # => true
  #
  # @return [Row] a new instance of Row
  #
  # source://csv//lib/csv/row.rb#105
  def initialize(headers, fields, header_row = T.unsafe(nil)); end

  # :call-seq:
  #   row << [header, value] -> self
  #   row << hash -> self
  #   row << value -> self
  #
  # Adds a field to +self+; returns +self+:
  #
  # If the argument is a 2-element \Array <tt>[header, value]</tt>,
  # a field is added with the given +header+ and +value+:
  #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
  #   table = CSV.parse(source, headers: true)
  #   row = table[0]
  #   row << ['NAME', 'Bat']
  #   row # => #<CSV::Row "Name":"Foo" "Name":"Bar" "Name":"Baz" "NAME":"Bat">
  #
  # If the argument is a \Hash, each <tt>key-value</tt> pair is added
  # as a field with header +key+ and value +value+.
  #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
  #   table = CSV.parse(source, headers: true)
  #   row = table[0]
  #   row << {NAME: 'Bat', name: 'Bam'}
  #   row # => #<CSV::Row "Name":"Foo" "Name":"Bar" "Name":"Baz" NAME:"Bat" name:"Bam">
  #
  # Otherwise, the given +value+ is added as a field with no header.
  #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
  #   table = CSV.parse(source, headers: true)
  #   row = table[0]
  #   row << 'Bag'
  #   row # => #<CSV::Row "Name":"Foo" "Name":"Bar" "Name":"Baz" nil:"Bag">
  #
  # source://csv//lib/csv/row.rb#389
  def <<(arg); end

  # :call-seq:
  #   row == other -> true or false
  #
  # Returns +true+ if +other+ is a /CSV::Row that has the same
  # fields (headers and values) in the same order as +self+;
  # otherwise returns +false+:
  #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
  #   table = CSV.parse(source, headers: true)
  #   row = table[0]
  #   other_row = table[0]
  #   row == other_row # => true
  #   other_row = table[1]
  #   row == other_row # => false
  #
  # source://csv//lib/csv/row.rb#633
  def ==(other); end

  # :call-seq:
  #   field(index) -> value
  #   field(header) -> value
  #   field(header, offset) -> value
  #
  # Returns the field value for the given +index+ or +header+.
  #
  # ---
  #
  # Fetch field value by \Integer index:
  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   table = CSV.parse(source, headers: true)
  #   row = table[0]
  #   row.field(0) # => "foo"
  #   row.field(1) # => "bar"
  #
  # Counts backward from the last column if +index+ is negative:
  #   row.field(-1) # => "0"
  #   row.field(-2) # => "foo"
  #
  # Returns +nil+ if +index+ is out of range:
  #   row.field(2) # => nil
  #   row.field(-3) # => nil
  #
  # ---
  #
  # Fetch field value by header (first found):
  #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
  #   table = CSV.parse(source, headers: true)
  #   row = table[0]
  #   row.field('Name') # => "Foo"
  #
  # Fetch field value by header, ignoring +offset+ leading fields:
  #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
  #   table = CSV.parse(source, headers: true)
  #   row = table[0]
  #   row.field('Name', 2) # => "Baz"
  #
  # Returns +nil+ if the header does not exist.
  #
  # source://csv//lib/csv/row.rb#215
  def [](header_or_index, minimum_index = T.unsafe(nil)); end

  # :call-seq:
  #   row[index] = value -> value
  #   row[header, offset] = value -> value
  #   row[header] = value -> value
  #
  # Assigns the field value for the given +index+ or +header+;
  # returns +value+.
  #
  # ---
  #
  # Assign field value by \Integer index:
  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   table = CSV.parse(source, headers: true)
  #   row = table[0]
  #   row[0] = 'Bat'
  #   row[1] = 3
  #   row # => #<CSV::Row "Name":"Bat" "Value":3>
  #
  # Counts backward from the last column if +index+ is negative:
  #   row[-1] = 4
  #   row[-2] = 'Bam'
  #   row # => #<CSV::Row "Name":"Bam" "Value":4>
  #
  # Extends the row with <tt>nil:nil</tt> if positive +index+ is not in the row:
  #   row[4] = 5
  #   row # => #<CSV::Row "Name":"bad" "Value":4 nil:nil nil:nil nil:5>
  #
  # Raises IndexError if negative +index+ is too small (too far from zero).
  #
  # ---
  #
  # Assign field value by header (first found):
  #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
  #   table = CSV.parse(source, headers: true)
  #   row = table[0]
  #   row['Name'] = 'Bat'
  #   row # => #<CSV::Row "Name":"Bat" "Name":"Bar" "Name":"Baz">
  #
  # Assign field value by header, ignoring +offset+ leading fields:
  #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
  #   table = CSV.parse(source, headers: true)
  #   row = table[0]
  #   row['Name', 2] = 4
  #   row # => #<CSV::Row "Name":"Foo" "Name":"Bar" "Name":4>
  #
  # Append new field by (new) header:
  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   table = CSV.parse(source, headers: true)
  #   row = table[0]
  #   row['New'] = 6
  #   row# => #<CSV::Row "Name":"foo" "Value":"0" "New":6>
  #
  # source://csv//lib/csv/row.rb#339
  def []=(*args); end

  # :call-seq:
  #   row.deconstruct -> array
  #
  # Returns the new \Array suitable for pattern matching containing the values
  # of the row.
  #
  # source://csv//lib/csv/row.rb#682
  def deconstruct; end

  # :call-seq:
  #   row.deconstruct_keys(keys) -> hash
  #
  # Returns the new \Hash suitable for pattern matching containing only the
  # keys specified as an argument.
  #
  # source://csv//lib/csv/row.rb#667
  def deconstruct_keys(keys); end

  # :call-seq:
  #   delete(index) -> [header, value] or nil
  #   delete(header) -> [header, value] or empty_array
  #   delete(header, offset) -> [header, value] or empty_array
  #
  # Removes a specified field from +self+; returns the 2-element \Array
  # <tt>[header, value]</tt> if the field exists.
  #
  # If an \Integer argument +index+ is given,
  # removes and returns the field at offset +index+,
  # or returns +nil+ if the field does not exist:
  #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
  #   table = CSV.parse(source, headers: true)
  #   row = table[0]
  #   row.delete(1) # => ["Name", "Bar"]
  #   row.delete(50) # => nil
  #
  # Otherwise, if the single argument +header+ is given,
  # removes and returns the first-found field with the given header,
  # of returns a new empty \Array if the field does not exist:
  #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
  #   table = CSV.parse(source, headers: true)
  #   row = table[0]
  #   row.delete('Name') # => ["Name", "Foo"]
  #   row.delete('NAME') # => []
  #
  # If argument +header+ and \Integer argument +offset+ are given,
  # removes and returns the first-found field with the given header
  # whose +index+ is at least as large as +offset+:
  #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
  #   table = CSV.parse(source, headers: true)
  #   row = table[0]
  #   row.delete('Name', 1) # => ["Name", "Bar"]
  #   row.delete('NAME', 1) # => []
  #
  # source://csv//lib/csv/row.rb#451
  def delete(header_or_index, minimum_index = T.unsafe(nil)); end

  # :call-seq:
  #   row.delete_if {|header, value| ... } -> self
  #
  # Removes fields from +self+ as selected by the block; returns +self+.
  #
  # Removes each field for which the block returns a truthy value:
  #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
  #   table = CSV.parse(source, headers: true)
  #   row = table[0]
  #   row.delete_if {|header, value| value.start_with?('B') } # => true
  #   row # => #<CSV::Row "Name":"Foo">
  #   row.delete_if {|header, value| header.start_with?('B') } # => false
  #
  # If no block is given, returns a new Enumerator:
  #   row.delete_if # => #<Enumerator: #<CSV::Row "Name":"Foo">:delete_if>
  #
  # source://csv//lib/csv/row.rb#476
  def delete_if(&block); end

  # :call-seq:
  #   row.dig(index_or_header, *identifiers) -> object
  #
  # Finds and returns the object in nested object that is specified
  # by +index_or_header+ and +specifiers+.
  #
  # The nested objects may be instances of various classes.
  # See {Dig Methods}[rdoc-ref:dig_methods.rdoc].
  #
  # Examples:
  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   table = CSV.parse(source, headers: true)
  #   row = table[0]
  #   row.dig(1) # => "0"
  #   row.dig('Value') # => "0"
  #   row.dig(5) # => nil
  #
  # source://csv//lib/csv/row.rb#715
  def dig(index_or_header, *indexes); end

  # :call-seq:
  #   row.each {|header, value| ... } -> self
  #
  # Calls the block with each header-value pair; returns +self+:
  #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
  #   table = CSV.parse(source, headers: true)
  #   row = table[0]
  #   row.each {|header, value| p [header, value] }
  # Output:
  #   ["Name", "Foo"]
  #   ["Name", "Bar"]
  #   ["Name", "Baz"]
  #
  # If no block is given, returns a new Enumerator:
  #   row.each # => #<Enumerator: #<CSV::Row "Name":"Foo" "Name":"Bar" "Name":"Baz">:each>
  #
  # source://csv//lib/csv/row.rb#610
  def each(&block); end

  # :call-seq:
  #   row.each {|header, value| ... } -> self
  #
  # Calls the block with each header-value pair; returns +self+:
  #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
  #   table = CSV.parse(source, headers: true)
  #   row = table[0]
  #   row.each {|header, value| p [header, value] }
  # Output:
  #   ["Name", "Foo"]
  #   ["Name", "Bar"]
  #   ["Name", "Baz"]
  #
  # If no block is given, returns a new Enumerator:
  #   row.each # => #<Enumerator: #<CSV::Row "Name":"Foo" "Name":"Bar" "Name":"Baz">:each>
  #
  # source://csv//lib/csv/row.rb#618
  def each_pair(&block); end

  # source://csv//lib/csv/row.rb#124
  def empty?(*args, **_arg1, &block); end

  # :call-seq:
  #   fetch(header) -> value
  #   fetch(header, default) -> value
  #   fetch(header) {|row| ... } -> value
  #
  # Returns the field value as specified by +header+.
  #
  # ---
  #
  # With the single argument +header+, returns the field value
  # for that header (first found):
  #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
  #   table = CSV.parse(source, headers: true)
  #   row = table[0]
  #   row.fetch('Name') # => "Foo"
  #
  # Raises exception +KeyError+ if the header does not exist.
  #
  # ---
  #
  # With arguments +header+ and +default+ given,
  # returns the field value for the header (first found)
  # if the header exists, otherwise returns +default+:
  #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
  #   table = CSV.parse(source, headers: true)
  #   row = table[0]
  #   row.fetch('Name', '') # => "Foo"
  #   row.fetch(:nosuch, '') # => ""
  #
  # ---
  #
  # With argument +header+ and a block given,
  # returns the field value for the header (first found)
  # if the header exists; otherwise calls the block
  # and returns its return value:
  #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
  #   table = CSV.parse(source, headers: true)
  #   row = table[0]
  #   row.fetch('Name') {|header| fail 'Cannot happen' } # => "Foo"
  #   row.fetch(:nosuch) {|header| "Header '#{header} not found'" } # => "Header 'nosuch not found'"
  #
  # @raise [ArgumentError]
  #
  # source://csv//lib/csv/row.rb#258
  def fetch(header, *varargs); end

  # :call-seq:
  #   field(index) -> value
  #   field(header) -> value
  #   field(header, offset) -> value
  #
  # Returns the field value for the given +index+ or +header+.
  #
  # ---
  #
  # Fetch field value by \Integer index:
  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   table = CSV.parse(source, headers: true)
  #   row = table[0]
  #   row.field(0) # => "foo"
  #   row.field(1) # => "bar"
  #
  # Counts backward from the last column if +index+ is negative:
  #   row.field(-1) # => "0"
  #   row.field(-2) # => "foo"
  #
  # Returns +nil+ if +index+ is out of range:
  #   row.field(2) # => nil
  #   row.field(-3) # => nil
  #
  # ---
  #
  # Fetch field value by header (first found):
  #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
  #   table = CSV.parse(source, headers: true)
  #   row = table[0]
  #   row.field('Name') # => "Foo"
  #
  # Fetch field value by header, ignoring +offset+ leading fields:
  #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
  #   table = CSV.parse(source, headers: true)
  #   row = table[0]
  #   row.field('Name', 2) # => "Baz"
  #
  # Returns +nil+ if the header does not exist.
  #
  # source://csv//lib/csv/row.rb#203
  def field(header_or_index, minimum_index = T.unsafe(nil)); end

  # :call-seq:
  #   row.field?(value) -> true or false
  #
  # Returns +true+ if +value+ is a field in this row, +false+ otherwise:
  #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
  #   table = CSV.parse(source, headers: true)
  #   row = table[0]
  #   row.field?('Bar') # => true
  #   row.field?('BAR') # => false
  #
  # @return [Boolean]
  #
  # source://csv//lib/csv/row.rb#589
  def field?(data); end

  # :call-seq:
  #   row.field_row? -> true or false
  #
  # Returns +true+ if this is a field row, +false+ otherwise.
  #
  # @return [Boolean]
  #
  # source://csv//lib/csv/row.rb#148
  def field_row?; end

  # :call-seq:
  #   self.fields(*specifiers) -> array_of_fields
  #
  # Returns field values per the given +specifiers+, which may be any mixture of:
  # - \Integer index.
  # - \Range of \Integer indexes.
  # - 2-element \Array containing a header and offset.
  # - Header.
  # - \Range of headers.
  #
  # For +specifier+ in one of the first four cases above,
  # returns the result of <tt>self.field(specifier)</tt>;  see #field.
  #
  # Although there may be any number of +specifiers+,
  # the examples here will illustrate one at a time.
  #
  # When the specifier is an \Integer +index+,
  # returns <tt>self.field(index)</tt>L
  #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
  #   table = CSV.parse(source, headers: true)
  #   row = table[0]
  #   row.fields(1) # => ["Bar"]
  #
  # When the specifier is a \Range of \Integers +range+,
  # returns <tt>self.field(range)</tt>:
  #   row.fields(1..2) # => ["Bar", "Baz"]
  #
  # When the specifier is a 2-element \Array +array+,
  # returns <tt>self.field(array)</tt>L
  #   row.fields('Name', 1) # => ["Foo", "Bar"]
  #
  # When the specifier is a header +header+,
  # returns <tt>self.field(header)</tt>L
  #   row.fields('Name') # => ["Foo"]
  #
  # When the specifier is a \Range of headers +range+,
  # forms a new \Range +new_range+ from the indexes of
  # <tt>range.start</tt> and <tt>range.end</tt>,
  # and returns <tt>self.field(new_range)</tt>:
  #   source = "Name,NAME,name\nFoo,Bar,Baz\n"
  #   table = CSV.parse(source, headers: true)
  #   row = table[0]
  #   row.fields('Name'..'NAME') # => ["Foo", "Bar"]
  #
  # Returns all fields if no argument given:
  #   row.fields # => ["Foo", "Bar", "Baz"]
  #
  # source://csv//lib/csv/row.rb#530
  def fields(*headers_and_or_indices); end

  # :call-seq:
  #   row.has_key?(header) -> true or false
  #
  # Returns +true+ if there is a field with the given +header+,
  # +false+ otherwise.
  #
  # @return [Boolean]
  #
  # source://csv//lib/csv/row.rb#279
  def has_key?(header); end

  # :call-seq:
  #   row.has_key?(header) -> true or false
  #
  # Returns +true+ if there is a field with the given +header+,
  # +false+ otherwise.
  #
  # @return [Boolean]
  #
  # source://csv//lib/csv/row.rb#285
  def header?(header); end

  # :call-seq:
  #   row.header_row? -> true or false
  #
  # Returns +true+ if this is a header row, +false+ otherwise.
  #
  # @return [Boolean]
  #
  # source://csv//lib/csv/row.rb#140
  def header_row?; end

  # :call-seq:
  #    row.headers -> array_of_headers
  #
  # Returns the headers for this row:
  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   table = CSV.parse(source, headers: true)
  #   row = table.first
  #   row.headers # => ["Name", "Value"]
  #
  # source://csv//lib/csv/row.rb#160
  def headers; end

  # :call-seq:
  #   row.has_key?(header) -> true or false
  #
  # Returns +true+ if there is a field with the given +header+,
  # +false+ otherwise.
  #
  # @return [Boolean]
  #
  # source://csv//lib/csv/row.rb#282
  def include?(header); end

  # :call-seq:
  #   index(header) -> index
  #   index(header, offset) -> index
  #
  # Returns the index for the given header, if it exists;
  # otherwise returns +nil+.
  #
  # With the single argument +header+, returns the index
  # of the first-found field with the given +header+:
  #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
  #   table = CSV.parse(source, headers: true)
  #   row = table[0]
  #   row.index('Name') # => 0
  #   row.index('NAME') # => nil
  #
  # With arguments +header+ and +offset+,
  # returns the index of the first-found field with given +header+,
  # but ignoring the first +offset+ fields:
  #   row.index('Name', 1) # => 1
  #   row.index('Name', 3) # => nil
  #
  # source://csv//lib/csv/row.rb#573
  def index(header, minimum_index = T.unsafe(nil)); end

  # :call-seq:
  #   row.inspect -> string
  #
  # Returns an ASCII-compatible \String showing:
  # - Class \CSV::Row.
  # - Header-value pairs.
  # Example:
  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   table = CSV.parse(source, headers: true)
  #   row = table[0]
  #   row.inspect # => "#<CSV::Row \"Name\":\"foo\" \"Value\":\"0\">"
  #
  # source://csv//lib/csv/row.rb#740
  def inspect; end

  # :call-seq:
  #   row.has_key?(header) -> true or false
  #
  # Returns +true+ if there is a field with the given +header+,
  # +false+ otherwise.
  #
  # @return [Boolean]
  #
  # source://csv//lib/csv/row.rb#283
  def key?(header); end

  # source://csv//lib/csv/row.rb#124
  def length(*args, **_arg1, &block); end

  # :call-seq:
  #   row.has_key?(header) -> true or false
  #
  # Returns +true+ if there is a field with the given +header+,
  # +false+ otherwise.
  #
  # @return [Boolean]
  #
  # source://csv//lib/csv/row.rb#284
  def member?(header); end

  # :call-seq:
  #   row.push(*values) -> self
  #
  # Appends each of the given +values+ to +self+ as a field; returns +self+:
  #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
  #   table = CSV.parse(source, headers: true)
  #   row = table[0]
  #   row.push('Bat', 'Bam')
  #   row # => #<CSV::Row "Name":"Foo" "Name":"Bar" "Name":"Baz" nil:"Bat" nil:"Bam">
  #
  # source://csv//lib/csv/row.rb#410
  def push(*args); end

  # source://csv//lib/csv/row.rb#124
  def size(*args, **_arg1, &block); end

  # source://csv//lib/csv/row.rb#675
  def to_ary(*_arg0); end

  # :call-seq:
  #   row.to_csv -> csv_string
  #
  # Returns the row as a \CSV String. Headers are not included:
  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   table = CSV.parse(source, headers: true)
  #   row = table[0]
  #   row.to_csv # => "foo,0\n"
  #
  # source://csv//lib/csv/row.rb#694
  def to_csv(**options); end

  # :call-seq:
  #   row.to_h -> hash
  #
  # Returns the new \Hash formed by adding each header-value pair in +self+
  # as a key-value pair in the \Hash.
  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   table = CSV.parse(source, headers: true)
  #   row = table[0]
  #   row.to_h # => {"Name"=>"foo", "Value"=>"0"}
  #
  # Header order is preserved, but repeated headers are ignored:
  #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
  #   table = CSV.parse(source, headers: true)
  #   row = table[0]
  #   row.to_h # => {"Name"=>"Foo"}
  #
  # source://csv//lib/csv/row.rb#653
  def to_h; end

  # :call-seq:
  #   row.to_h -> hash
  #
  # Returns the new \Hash formed by adding each header-value pair in +self+
  # as a key-value pair in the \Hash.
  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   table = CSV.parse(source, headers: true)
  #   row = table[0]
  #   row.to_h # => {"Name"=>"foo", "Value"=>"0"}
  #
  # Header order is preserved, but repeated headers are ignored:
  #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
  #   table = CSV.parse(source, headers: true)
  #   row = table[0]
  #   row.to_h # => {"Name"=>"Foo"}
  #
  # source://csv//lib/csv/row.rb#660
  def to_hash; end

  # :call-seq:
  #   row.to_csv -> csv_string
  #
  # Returns the row as a \CSV String. Headers are not included:
  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   table = CSV.parse(source, headers: true)
  #   row = table[0]
  #   row.to_csv # => "foo,0\n"
  #
  # source://csv//lib/csv/row.rb#697
  def to_s(**options); end

  # :call-seq:
  #   self.fields(*specifiers) -> array_of_fields
  #
  # Returns field values per the given +specifiers+, which may be any mixture of:
  # - \Integer index.
  # - \Range of \Integer indexes.
  # - 2-element \Array containing a header and offset.
  # - Header.
  # - \Range of headers.
  #
  # For +specifier+ in one of the first four cases above,
  # returns the result of <tt>self.field(specifier)</tt>;  see #field.
  #
  # Although there may be any number of +specifiers+,
  # the examples here will illustrate one at a time.
  #
  # When the specifier is an \Integer +index+,
  # returns <tt>self.field(index)</tt>L
  #   source = "Name,Name,Name\nFoo,Bar,Baz\n"
  #   table = CSV.parse(source, headers: true)
  #   row = table[0]
  #   row.fields(1) # => ["Bar"]
  #
  # When the specifier is a \Range of \Integers +range+,
  # returns <tt>self.field(range)</tt>:
  #   row.fields(1..2) # => ["Bar", "Baz"]
  #
  # When the specifier is a 2-element \Array +array+,
  # returns <tt>self.field(array)</tt>L
  #   row.fields('Name', 1) # => ["Foo", "Bar"]
  #
  # When the specifier is a header +header+,
  # returns <tt>self.field(header)</tt>L
  #   row.fields('Name') # => ["Foo"]
  #
  # When the specifier is a \Range of headers +range+,
  # forms a new \Range +new_range+ from the indexes of
  # <tt>range.start</tt> and <tt>range.end</tt>,
  # and returns <tt>self.field(new_range)</tt>:
  #   source = "Name,NAME,name\nFoo,Bar,Baz\n"
  #   table = CSV.parse(source, headers: true)
  #   row = table[0]
  #   row.fields('Name'..'NAME') # => ["Foo", "Bar"]
  #
  # Returns all fields if no argument given:
  #   row.fields # => ["Foo", "Bar", "Baz"]
  #
  # source://csv//lib/csv/row.rb#551
  def values_at(*headers_and_or_indices); end

  protected

  # Internal data format used to compare equality.
  #
  # source://csv//lib/csv/row.rb#118
  def row; end

  private

  # :call-seq:
  #   row.initialize_copy(other_row) -> self
  #
  # Calls superclass method.
  #
  # source://csv//lib/csv/row.rb#130
  def initialize_copy(other); end
end

# source://csv//lib/csv.rb#2132
class CSV::TSV < ::CSV
  # @return [TSV] a new instance of TSV
  #
  # source://csv//lib/csv.rb#2133
  def initialize(data, **options); end
end

# = \CSV::Table
# A \CSV::Table instance represents \CSV data.
# (see {class CSV}[../CSV.html]).
#
# The instance may have:
# - Rows: each is a Table::Row object.
# - Headers: names for the columns.
#
# === Instance Methods
#
# \CSV::Table has three groups of instance methods:
# - Its own internally defined instance methods.
# - Methods included by module Enumerable.
# - Methods delegated to class Array.:
#   * Array#empty?
#   * Array#length
#   * Array#size
#
# == Creating a \CSV::Table Instance
#
# Commonly, a new \CSV::Table instance is created by parsing \CSV source
# using headers:
#   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
#   table = CSV.parse(source, headers: true)
#   table.class # => CSV::Table
#
# You can also create an instance directly. See ::new.
#
# == Headers
#
# If a table has headers, the headers serve as labels for the columns of data.
# Each header serves as the label for its column.
#
# The headers for a \CSV::Table object are stored as an \Array of Strings.
#
# Commonly, headers are defined in the first row of \CSV source:
#   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
#   table = CSV.parse(source, headers: true)
#   table.headers # => ["Name", "Value"]
#
# If no headers are defined, the \Array is empty:
#   table = CSV::Table.new([])
#   table.headers # => []
#
# == Access Modes
#
# \CSV::Table provides three modes for accessing table data:
# - \Row mode.
# - Column mode.
# - Mixed mode (the default for a new table).
#
# The access mode for a\CSV::Table instance affects the behavior
# of some of its instance methods:
# - #[]
# - #[]=
# - #delete
# - #delete_if
# - #each
# - #values_at
#
# === \Row Mode
#
# Set a table to row mode with method #by_row!:
#   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
#   table = CSV.parse(source, headers: true)
#   table.by_row! # => #<CSV::Table mode:row row_count:4>
#
# Specify a single row by an \Integer index:
#   # Get a row.
#   table[1] # => #<CSV::Row "Name":"bar" "Value":"1">
#   # Set a row, then get it.
#   table[1] = CSV::Row.new(['Name', 'Value'], ['bam', 3])
#   table[1] # => #<CSV::Row "Name":"bam" "Value":3>
#
# Specify a sequence of rows by a \Range:
#   # Get rows.
#   table[1..2] # => [#<CSV::Row "Name":"bam" "Value":3>, #<CSV::Row "Name":"baz" "Value":"2">]
#   # Set rows, then get them.
#   table[1..2] = [
#     CSV::Row.new(['Name', 'Value'], ['bat', 4]),
#     CSV::Row.new(['Name', 'Value'], ['bad', 5]),
#   ]
#   table[1..2] # => [["Name", #<CSV::Row "Name":"bat" "Value":4>], ["Value", #<CSV::Row "Name":"bad" "Value":5>]]
#
# === Column Mode
#
# Set a table to column mode with method #by_col!:
#   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
#   table = CSV.parse(source, headers: true)
#   table.by_col! # => #<CSV::Table mode:col row_count:4>
#
# Specify a column by an \Integer index:
#   # Get a column.
#   table[0]
#   # Set a column, then get it.
#   table[0] = ['FOO', 'BAR', 'BAZ']
#   table[0] # => ["FOO", "BAR", "BAZ"]
#
# Specify a column by its \String header:
#   # Get a column.
#   table['Name'] # => ["FOO", "BAR", "BAZ"]
#   # Set a column, then get it.
#   table['Name'] = ['Foo', 'Bar', 'Baz']
#   table['Name'] # => ["Foo", "Bar", "Baz"]
#
# === Mixed Mode
#
# In mixed mode, you can refer to either rows or columns:
# - An \Integer index refers to a row.
# - A \Range index refers to multiple rows.
# - A \String index refers to a column.
#
# Set a table to mixed mode with method #by_col_or_row!:
#   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
#   table = CSV.parse(source, headers: true)
#   table.by_col_or_row! # => #<CSV::Table mode:col_or_row row_count:4>
#
# Specify a single row by an \Integer index:
#   # Get a row.
#   table[1] # => #<CSV::Row "Name":"bar" "Value":"1">
#   # Set a row, then get it.
#   table[1] = CSV::Row.new(['Name', 'Value'], ['bam', 3])
#   table[1] # => #<CSV::Row "Name":"bam" "Value":3>
#
# Specify a sequence of rows by a \Range:
#   # Get rows.
#   table[1..2] # => [#<CSV::Row "Name":"bam" "Value":3>, #<CSV::Row "Name":"baz" "Value":"2">]
#   # Set rows, then get them.
#   table[1] = CSV::Row.new(['Name', 'Value'], ['bat', 4])
#   table[2] = CSV::Row.new(['Name', 'Value'], ['bad', 5])
#   table[1..2] # => [["Name", #<CSV::Row "Name":"bat" "Value":4>], ["Value", #<CSV::Row "Name":"bad" "Value":5>]]
#
# Specify a column by its \String header:
#   # Get a column.
#   table['Name'] # => ["foo", "bat", "bad"]
#   # Set a column, then get it.
#   table['Name'] = ['Foo', 'Bar', 'Baz']
#   table['Name'] # => ["Foo", "Bar", "Baz"]
#
# source://csv//lib/csv/table.rb#144
class CSV::Table
  include ::Enumerable
  extend ::Forwardable

  # :call-seq:
  #   CSV::Table.new(array_of_rows, headers = nil) -> csv_table
  #
  # Returns a new \CSV::Table object.
  #
  # - Argument +array_of_rows+ must be an \Array of CSV::Row objects.
  # - Argument +headers+, if given, may be an \Array of Strings.
  #
  # ---
  #
  # Create an empty \CSV::Table object:
  #   table = CSV::Table.new([])
  #   table # => #<CSV::Table mode:col_or_row row_count:1>
  #
  # Create a non-empty \CSV::Table object:
  #   rows = [
  #     CSV::Row.new([], []),
  #     CSV::Row.new([], []),
  #     CSV::Row.new([], []),
  #   ]
  #   table  = CSV::Table.new(rows)
  #   table # => #<CSV::Table mode:col_or_row row_count:4>
  #
  # ---
  #
  # If argument +headers+ is an \Array of Strings,
  # those Strings become the table's headers:
  #   table = CSV::Table.new([], headers: ['Name', 'Age'])
  #   table.headers # => ["Name", "Age"]
  #
  # If argument +headers+ is not given and the table has rows,
  # the headers are taken from the first row:
  #   rows = [
  #     CSV::Row.new(['Foo', 'Bar'], []),
  #     CSV::Row.new(['foo', 'bar'], []),
  #     CSV::Row.new(['FOO', 'BAR'], []),
  #   ]
  #   table  = CSV::Table.new(rows)
  #   table.headers # => ["Foo", "Bar"]
  #
  # If argument +headers+ is not given and the table is empty (has no rows),
  # the headers are also empty:
  #   table  = CSV::Table.new([])
  #   table.headers # => []
  #
  # ---
  #
  # Raises an exception if argument +array_of_rows+ is not an \Array object:
  #   # Raises NoMethodError (undefined method `first' for :foo:Symbol):
  #   CSV::Table.new(:foo)
  #
  # Raises an exception if an element of +array_of_rows+ is not a \CSV::Table object:
  #   # Raises NoMethodError (undefined method `headers' for :foo:Symbol):
  #   CSV::Table.new([:foo])
  #
  # @return [Table] a new instance of Table
  #
  # source://csv//lib/csv/table.rb#199
  def initialize(array_of_rows, headers: T.unsafe(nil)); end

  # :call-seq:
  #   table << row_or_array -> self
  #
  # If +row_or_array+ is a \CSV::Row object,
  # it is appended to the table:
  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   table = CSV.parse(source, headers: true)
  #   table << CSV::Row.new(table.headers, ['bat', 3])
  #   table[3] # => #<CSV::Row "Name":"bat" "Value":3>
  #
  # If +row_or_array+ is an \Array, it is used to create a new
  # \CSV::Row object which is then appended to the table:
  #   table << ['bam', 4]
  #   table[4] # => #<CSV::Row "Name":"bam" "Value":4>
  #
  # source://csv//lib/csv/table.rb#762
  def <<(row_or_array); end

  # :call-seq:
  #   table == other_table -> true or false
  #
  # Returns +true+ if all each row of +self+ <tt>==</tt>
  # the corresponding row of +other_table+, otherwise, +false+.
  #
  # The access mode does no affect the result.
  #
  # Equal tables:
  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   table = CSV.parse(source, headers: true)
  #   other_table = CSV.parse(source, headers: true)
  #   table == other_table # => true
  #
  # Different row count:
  #   other_table.delete(2)
  #   table == other_table # => false
  #
  # Different last row:
  #   other_table << ['bat', 3]
  #   table == other_table # => false
  #
  # source://csv//lib/csv/table.rb#965
  def ==(other); end

  # :call-seq:
  #   table[n] -> row or column_data
  #   table[range] -> array_of_rows or array_of_column_data
  #   table[header] -> array_of_column_data
  #
  # Returns data from the table;  does not modify the table.
  #
  # ---
  #
  # Fetch a \Row by Its \Integer Index::
  # - Form: <tt>table[n]</tt>, +n+ an integer.
  # - Access mode: <tt>:row</tt> or <tt>:col_or_row</tt>.
  # - Return value: _nth_ row of the table, if that row exists;
  #   otherwise +nil+.
  #
  # Returns the _nth_ row of the table if that row exists:
  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   table = CSV.parse(source, headers: true)
  #   table.by_row! # => #<CSV::Table mode:row row_count:4>
  #   table[1] # => #<CSV::Row "Name":"bar" "Value":"1">
  #   table.by_col_or_row! # => #<CSV::Table mode:col_or_row row_count:4>
  #   table[1] # => #<CSV::Row "Name":"bar" "Value":"1">
  #
  # Counts backward from the last row if +n+ is negative:
  #   table[-1] # => #<CSV::Row "Name":"baz" "Value":"2">
  #
  # Returns +nil+ if +n+ is too large or too small:
  #   table[4] # => nil
  #   table[-4] # => nil
  #
  # Raises an exception if the access mode is <tt>:row</tt>
  # and +n+ is not an \Integer:
  #   table.by_row! # => #<CSV::Table mode:row row_count:4>
  #   # Raises TypeError (no implicit conversion of String into Integer):
  #   table['Name']
  #
  # ---
  #
  # Fetch a Column by Its \Integer Index::
  # - Form: <tt>table[n]</tt>, +n+ an \Integer.
  # - Access mode: <tt>:col</tt>.
  # - Return value: _nth_ column of the table, if that column exists;
  #   otherwise an \Array of +nil+ fields of length <tt>self.size</tt>.
  #
  # Returns the _nth_ column of the table if that column exists:
  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   table = CSV.parse(source, headers: true)
  #   table.by_col! # => #<CSV::Table mode:col row_count:4>
  #   table[1] # => ["0", "1", "2"]
  #
  # Counts backward from the last column if +n+ is negative:
  #   table[-2] # => ["foo", "bar", "baz"]
  #
  # Returns an \Array of +nil+ fields if +n+ is too large or too small:
  #   table[4] # => [nil, nil, nil]
  #   table[-4] # => [nil, nil, nil]
  #
  # ---
  #
  # Fetch Rows by \Range::
  # - Form: <tt>table[range]</tt>, +range+ a \Range object.
  # - Access mode: <tt>:row</tt> or <tt>:col_or_row</tt>.
  # - Return value: rows from the table, beginning at row <tt>range.start</tt>,
  #   if those rows exists.
  #
  # Returns rows from the table, beginning at row <tt>range.first</tt>,
  # if those rows exist:
  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   table = CSV.parse(source, headers: true)
  #   table.by_row! # => #<CSV::Table mode:row row_count:4>
  #   rows = table[1..2] # => #<CSV::Row "Name":"bar" "Value":"1">
  #   rows # => [#<CSV::Row "Name":"bar" "Value":"1">, #<CSV::Row "Name":"baz" "Value":"2">]
  #   table.by_col_or_row! # => #<CSV::Table mode:col_or_row row_count:4>
  #   rows = table[1..2] # => #<CSV::Row "Name":"bar" "Value":"1">
  #   rows # => [#<CSV::Row "Name":"bar" "Value":"1">, #<CSV::Row "Name":"baz" "Value":"2">]
  #
  # If there are too few rows, returns all from <tt>range.start</tt> to the end:
  #   rows = table[1..50] # => #<CSV::Row "Name":"bar" "Value":"1">
  #   rows # => [#<CSV::Row "Name":"bar" "Value":"1">, #<CSV::Row "Name":"baz" "Value":"2">]
  #
  # Special case: if <tt>range.start == table.size</tt>, returns an empty \Array:
  #   table[table.size..50] # => []
  #
  # If <tt>range.end</tt> is negative, calculates the ending index from the end:
  #   rows = table[0..-1]
  #   rows # => [#<CSV::Row "Name":"foo" "Value":"0">, #<CSV::Row "Name":"bar" "Value":"1">, #<CSV::Row "Name":"baz" "Value":"2">]
  #
  # If <tt>range.start</tt> is negative, calculates the starting index from the end:
  #   rows = table[-1..2]
  #   rows # => [#<CSV::Row "Name":"baz" "Value":"2">]
  #
  # If <tt>range.start</tt> is larger than <tt>table.size</tt>, returns +nil+:
  #   table[4..4] # => nil
  #
  # ---
  #
  # Fetch Columns by \Range::
  # - Form: <tt>table[range]</tt>, +range+ a \Range object.
  # - Access mode: <tt>:col</tt>.
  # - Return value: column data from the table, beginning at column <tt>range.start</tt>,
  #   if those columns exist.
  #
  # Returns column values from the table, if the column exists;
  # the values are arranged by row:
  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   table = CSV.parse(source, headers: true)
  #   table.by_col!
  #   table[0..1] # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
  #
  # Special case: if <tt>range.start == headers.size</tt>,
  # returns an \Array (size: <tt>table.size</tt>) of empty \Arrays:
  #   table[table.headers.size..50] # => [[], [], []]
  #
  # If <tt>range.end</tt> is negative, calculates the ending index from the end:
  #   table[0..-1] # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
  #
  # If <tt>range.start</tt> is negative, calculates the starting index from the end:
  #   table[-2..2] # => [["foo", "0"], ["bar", "1"], ["baz", "2"]]
  #
  # If <tt>range.start</tt> is larger than <tt>table.size</tt>,
  # returns an \Array of +nil+ values:
  #   table[4..4] # => [nil, nil, nil]
  #
  # ---
  #
  # Fetch a Column by Its \String Header::
  # - Form: <tt>table[header]</tt>, +header+ a \String header.
  # - Access mode: <tt>:col</tt> or <tt>:col_or_row</tt>
  # - Return value: column data from the table, if that +header+ exists.
  #
  # Returns column values from the table, if the column exists:
  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   table = CSV.parse(source, headers: true)
  #   table.by_col! # => #<CSV::Table mode:col row_count:4>
  #   table['Name'] # => ["foo", "bar", "baz"]
  #   table.by_col_or_row! # => #<CSV::Table mode:col_or_row row_count:4>
  #   col = table['Name']
  #   col # => ["foo", "bar", "baz"]
  #
  # Modifying the returned column values does not modify the table:
  #   col[0] = 'bat'
  #   col # => ["bat", "bar", "baz"]
  #   table['Name'] # => ["foo", "bar", "baz"]
  #
  # Returns an \Array of +nil+ values if there is no such column:
  #   table['Nosuch'] # => [nil, nil, nil]
  #
  # source://csv//lib/csv/table.rb#514
  def [](index_or_header); end

  # :call-seq:
  #   table[n] = row -> row
  #   table[n] = field_or_array_of_fields -> field_or_array_of_fields
  #   table[header] = field_or_array_of_fields -> field_or_array_of_fields
  #
  # Puts data onto the table.
  #
  # ---
  #
  # Set a \Row by Its \Integer Index::
  # - Form: <tt>table[n] = row</tt>, +n+ an \Integer,
  #   +row+ a \CSV::Row instance or an \Array of fields.
  # - Access mode: <tt>:row</tt> or <tt>:col_or_row</tt>.
  # - Return value: +row+.
  #
  # If the row exists, it is replaced:
  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   table = CSV.parse(source, headers: true)
  #   new_row = CSV::Row.new(['Name', 'Value'], ['bat', 3])
  #   table.by_row! # => #<CSV::Table mode:row row_count:4>
  #   return_value = table[0] = new_row
  #   return_value.equal?(new_row) # => true # Returned the row
  #   table[0].to_h # => {"Name"=>"bat", "Value"=>3}
  #
  # With access mode <tt>:col_or_row</tt>:
  #   table.by_col_or_row! # => #<CSV::Table mode:col_or_row row_count:4>
  #   table[0] = CSV::Row.new(['Name', 'Value'], ['bam', 4])
  #   table[0].to_h # => {"Name"=>"bam", "Value"=>4}
  #
  # With an \Array instead of a \CSV::Row, inherits headers from the table:
  #   array = ['bad', 5]
  #   return_value = table[0] = array
  #   return_value.equal?(array) # => true # Returned the array
  #   table[0].to_h # => {"Name"=>"bad", "Value"=>5}
  #
  # If the row does not exist, extends the table by adding rows:
  # assigns rows with +nil+ as needed:
  #   table.size # => 3
  #   table[5] = ['bag', 6]
  #   table.size # => 6
  #   table[3] # => nil
  #   table[4]# => nil
  #   table[5].to_h # => {"Name"=>"bag", "Value"=>6}
  #
  # Note that the +nil+ rows are actually +nil+, not a row of +nil+ fields.
  #
  # ---
  #
  # Set a Column by Its \Integer Index::
  # - Form: <tt>table[n] = array_of_fields</tt>, +n+ an \Integer,
  #   +array_of_fields+ an \Array of \String fields.
  # - Access mode: <tt>:col</tt>.
  # - Return value: +array_of_fields+.
  #
  # If the column exists, it is replaced:
  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   table = CSV.parse(source, headers: true)
  #   new_col = [3, 4, 5]
  #   table.by_col! # => #<CSV::Table mode:col row_count:4>
  #   return_value = table[1] = new_col
  #   return_value.equal?(new_col) # => true # Returned the column
  #   table[1] # => [3, 4, 5]
  #   # The rows, as revised:
  #   table.by_row! # => #<CSV::Table mode:row row_count:4>
  #   table[0].to_h # => {"Name"=>"foo", "Value"=>3}
  #   table[1].to_h # => {"Name"=>"bar", "Value"=>4}
  #   table[2].to_h # => {"Name"=>"baz", "Value"=>5}
  #   table.by_col! # => #<CSV::Table mode:col row_count:4>
  #
  # If there are too few values, fills with +nil+ values:
  #   table[1] = [0]
  #   table[1] # => [0, nil, nil]
  #
  # If there are too many values, ignores the extra values:
  #   table[1] = [0, 1, 2, 3, 4]
  #   table[1] # => [0, 1, 2]
  #
  # If a single value is given, replaces all fields in the column with that value:
  #   table[1] = 'bat'
  #   table[1] # => ["bat", "bat", "bat"]
  #
  # ---
  #
  # Set a Column by Its \String Header::
  # - Form: <tt>table[header] = field_or_array_of_fields</tt>,
  #   +header+ a \String header, +field_or_array_of_fields+ a field value
  #   or an \Array of \String fields.
  # - Access mode: <tt>:col</tt> or <tt>:col_or_row</tt>.
  # - Return value: +field_or_array_of_fields+.
  #
  # If the column exists, it is replaced:
  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   table = CSV.parse(source, headers: true)
  #   new_col = [3, 4, 5]
  #   table.by_col! # => #<CSV::Table mode:col row_count:4>
  #   return_value = table['Value'] = new_col
  #   return_value.equal?(new_col) # => true # Returned the column
  #   table['Value'] # => [3, 4, 5]
  #   # The rows, as revised:
  #   table.by_row! # => #<CSV::Table mode:row row_count:4>
  #   table[0].to_h # => {"Name"=>"foo", "Value"=>3}
  #   table[1].to_h # => {"Name"=>"bar", "Value"=>4}
  #   table[2].to_h # => {"Name"=>"baz", "Value"=>5}
  #   table.by_col! # => #<CSV::Table mode:col row_count:4>
  #
  # If there are too few values, fills with +nil+ values:
  #   table['Value'] = [0]
  #   table['Value'] # => [0, nil, nil]
  #
  # If there are too many values, ignores the extra values:
  #   table['Value'] = [0, 1, 2, 3, 4]
  #   table['Value'] # => [0, 1, 2]
  #
  # If the column does not exist, extends the table by adding columns:
  #   table['Note'] = ['x', 'y', 'z']
  #   table['Note'] # => ["x", "y", "z"]
  #   # The rows, as revised:
  #   table.by_row!
  #   table[0].to_h # => {"Name"=>"foo", "Value"=>0, "Note"=>"x"}
  #   table[1].to_h # => {"Name"=>"bar", "Value"=>1, "Note"=>"y"}
  #   table[2].to_h # => {"Name"=>"baz", "Value"=>2, "Note"=>"z"}
  #   table.by_col!
  #
  # If a single value is given, replaces all fields in the column with that value:
  #   table['Value'] = 'bat'
  #   table['Value'] # => ["bat", "bat", "bat"]
  #
  # source://csv//lib/csv/table.rb#649
  def []=(index_or_header, value); end

  # :call-seq:
  #   table.by_col -> table_dup
  #
  # Returns a duplicate of +self+, in column mode
  # (see {Column Mode}[#class-CSV::Table-label-Column+Mode]):
  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   table = CSV.parse(source, headers: true)
  #   table.mode # => :col_or_row
  #   dup_table = table.by_col
  #   dup_table.mode # => :col
  #   dup_table.equal?(table) # => false # It's a dup
  #
  # This may be used to chain method calls without changing the mode
  # (but also will affect performance and memory usage):
  #   dup_table.by_col['Name']
  #
  # Also note that changes to the duplicate table will not affect the original.
  #
  # source://csv//lib/csv/table.rb#242
  def by_col; end

  # :call-seq:
  #   table.by_col! -> self
  #
  # Sets the mode for +self+ to column mode
  # (see {Column Mode}[#class-CSV::Table-label-Column+Mode]); returns +self+:
  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   table = CSV.parse(source, headers: true)
  #   table.mode # => :col_or_row
  #   table1 = table.by_col!
  #   table.mode # => :col
  #   table1.equal?(table) # => true # Returned self
  #
  # source://csv//lib/csv/table.rb#257
  def by_col!; end

  # :call-seq:
  #   table.by_col_or_row -> table_dup
  #
  # Returns a duplicate of +self+, in mixed mode
  # (see {Mixed Mode}[#class-CSV::Table-label-Mixed+Mode]):
  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   table = CSV.parse(source, headers: true).by_col!
  #   table.mode # => :col
  #   dup_table = table.by_col_or_row
  #   dup_table.mode # => :col_or_row
  #   dup_table.equal?(table) # => false # It's a dup
  #
  # This may be used to chain method calls without changing the mode
  # (but also will affect performance and memory usage):
  #   dup_table.by_col_or_row['Name']
  #
  # Also note that changes to the duplicate table will not affect the original.
  #
  # source://csv//lib/csv/table.rb#280
  def by_col_or_row; end

  # :call-seq:
  #   table.by_col_or_row! -> self
  #
  # Sets the mode for +self+ to mixed mode
  # (see {Mixed Mode}[#class-CSV::Table-label-Mixed+Mode]); returns +self+:
  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   table = CSV.parse(source, headers: true).by_col!
  #   table.mode # => :col
  #   table1 = table.by_col_or_row!
  #   table.mode # => :col_or_row
  #   table1.equal?(table) # => true # Returned self
  #
  # source://csv//lib/csv/table.rb#295
  def by_col_or_row!; end

  # :call-seq:
  #   table.by_row -> table_dup
  #
  # Returns a duplicate of +self+, in row mode
  # (see {Row Mode}[#class-CSV::Table-label-Row+Mode]):
  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   table = CSV.parse(source, headers: true)
  #   table.mode # => :col_or_row
  #   dup_table = table.by_row
  #   dup_table.mode # => :row
  #   dup_table.equal?(table) # => false # It's a dup
  #
  # This may be used to chain method calls without changing the mode
  # (but also will affect performance and memory usage):
  #   dup_table.by_row[1]
  #
  # Also note that changes to the duplicate table will not affect the original.
  #
  # source://csv//lib/csv/table.rb#318
  def by_row; end

  # :call-seq:
  #   table.by_row! -> self
  #
  # Sets the mode for +self+ to row mode
  # (see {Row Mode}[#class-CSV::Table-label-Row+Mode]); returns +self+:
  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   table = CSV.parse(source, headers: true)
  #   table.mode # => :col_or_row
  #   table1 = table.by_row!
  #   table.mode # => :row
  #   table1.equal?(table) # => true # Returned self
  #
  # source://csv//lib/csv/table.rb#333
  def by_row!; end

  # :call-seq:
  #   table.delete(*indexes) -> deleted_values
  #   table.delete(*headers) -> deleted_values
  #
  # If the access mode is <tt>:row</tt> or <tt>:col_or_row</tt>,
  # and each argument is either an \Integer or a \Range,
  # returns deleted rows.
  # Otherwise, returns deleted columns data.
  #
  # In either case, the returned values are in the order
  # specified by the arguments.  Arguments may be repeated.
  #
  # ---
  #
  # Returns rows as an \Array of \CSV::Row objects.
  #
  # One index:
  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   table = CSV.parse(source, headers: true)
  #   deleted_values = table.delete(0)
  #   deleted_values # => [#<CSV::Row "Name":"foo" "Value":"0">]
  #
  # Two indexes:
  #   table = CSV.parse(source, headers: true)
  #   deleted_values = table.delete(2, 0)
  #   deleted_values # => [#<CSV::Row "Name":"baz" "Value":"2">, #<CSV::Row "Name":"foo" "Value":"0">]
  #
  # ---
  #
  # Returns columns data as column Arrays.
  #
  # One header:
  #   table = CSV.parse(source, headers: true)
  #   deleted_values = table.delete('Name')
  #   deleted_values # => ["foo", "bar", "baz"]
  #
  # Two headers:
  #   table = CSV.parse(source, headers: true)
  #   deleted_values = table.delete('Value', 'Name')
  #   deleted_values # => [["0", "1", "2"], ["foo", "bar", "baz"]]
  #
  # source://csv//lib/csv/table.rb#834
  def delete(*indexes_or_headers); end

  # :call-seq:
  #   table.delete_if {|row_or_column| ... } -> self
  #
  # Removes rows or columns for which the block returns a truthy value;
  # returns +self+.
  #
  # Removes rows when the access mode is <tt>:row</tt> or <tt>:col_or_row</tt>;
  # calls the block with each \CSV::Row object:
  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   table = CSV.parse(source, headers: true)
  #   table.by_row! # => #<CSV::Table mode:row row_count:4>
  #   table.size # => 3
  #   table.delete_if {|row| row['Name'].start_with?('b') }
  #   table.size # => 1
  #
  # Removes columns when the access mode is <tt>:col</tt>;
  # calls the block with each column as a 2-element array
  # containing the header and an \Array of column fields:
  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   table = CSV.parse(source, headers: true)
  #   table.by_col! # => #<CSV::Table mode:col row_count:4>
  #   table.headers.size # => 2
  #   table.delete_if {|column_data| column_data[1].include?('2') }
  #   table.headers.size # => 1
  #
  # Returns a new \Enumerator if no block is given:
  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   table = CSV.parse(source, headers: true)
  #   table.delete_if # => #<Enumerator: #<CSV::Table mode:col_or_row row_count:4>:delete_if>
  #
  # source://csv//lib/csv/table.rb#887
  def delete_if(&block); end

  # Extracts the nested value specified by the sequence of +index+ or +header+ objects by calling dig at each step,
  # returning nil if any intermediate step is nil.
  #
  # source://csv//lib/csv/table.rb#1021
  def dig(index_or_header, *index_or_headers); end

  # :call-seq:
  #  table.each {|row_or_column| ... ) -> self
  #
  # Calls the block with each row or column; returns +self+.
  #
  # When the access mode is <tt>:row</tt> or <tt>:col_or_row</tt>,
  # calls the block with each \CSV::Row object:
  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   table = CSV.parse(source, headers: true)
  #   table.by_row! # => #<CSV::Table mode:row row_count:4>
  #   table.each {|row| p row }
  # Output:
  #   #<CSV::Row "Name":"foo" "Value":"0">
  #   #<CSV::Row "Name":"bar" "Value":"1">
  #   #<CSV::Row "Name":"baz" "Value":"2">
  #
  # When the access mode is <tt>:col</tt>,
  # calls the block with each column as a 2-element array
  # containing the header and an \Array of column fields:
  #   table.by_col! # => #<CSV::Table mode:col row_count:4>
  #   table.each {|column_data| p column_data }
  # Output:
  #   ["Name", ["foo", "bar", "baz"]]
  #   ["Value", ["0", "1", "2"]]
  #
  # Returns a new \Enumerator if no block is given:
  #   table.each # => #<Enumerator: #<CSV::Table mode:col row_count:4>:each>
  #
  # source://csv//lib/csv/table.rb#930
  def each(&block); end

  # source://csv//lib/csv/table.rb#223
  def empty?(*args, **_arg1, &block); end

  # :call-seq:
  #   table.headers -> array_of_headers
  #
  # Returns a new \Array containing the \String headers for the table.
  #
  # If the table is not empty, returns the headers from the first row:
  #   rows = [
  #     CSV::Row.new(['Foo', 'Bar'], []),
  #     CSV::Row.new(['FOO', 'BAR'], []),
  #     CSV::Row.new(['foo', 'bar'], []),
  #   ]
  #   table  = CSV::Table.new(rows)
  #   table.headers # => ["Foo", "Bar"]
  #   table.delete(0)
  #   table.headers # => ["FOO", "BAR"]
  #   table.delete(0)
  #   table.headers # => ["foo", "bar"]
  #
  # If the table is empty, returns a copy of the headers in the table itself:
  #   table.delete(0)
  #   table.headers # => ["Foo", "Bar"]
  #
  # source://csv//lib/csv/table.rb#360
  def headers; end

  # :call-seq:
  #   table.inspect => string
  #
  # Returns a <tt>US-ASCII</tt>-encoded \String showing table:
  # - Class: <tt>CSV::Table</tt>.
  # - Access mode: <tt>:row</tt>, <tt>:col</tt>, or <tt>:col_or_row</tt>.
  # - Size:  Row count, including the header row.
  #
  # Example:
  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   table = CSV.parse(source, headers: true)
  #   table.inspect # => "#<CSV::Table mode:col_or_row row_count:4>\nName,Value\nfoo,0\nbar,1\nbaz,2\n"
  #
  # source://csv//lib/csv/table.rb#1048
  def inspect; end

  # source://csv//lib/csv/table.rb#223
  def length(*args, **_arg1, &block); end

  # The current access mode for indexing and iteration.
  #
  # source://csv//lib/csv/table.rb#214
  def mode; end

  # :call-seq:
  #   table.push(*rows_or_arrays) -> self
  #
  # A shortcut for appending multiple rows. Equivalent to:
  #   rows.each {|row| self << row }
  #
  # Each argument may be either a \CSV::Row object or an \Array:
  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   table = CSV.parse(source, headers: true)
  #   rows = [
  #     CSV::Row.new(table.headers, ['bat', 3]),
  #     ['bam', 4]
  #   ]
  #   table.push(*rows)
  #   table[3..4] # => [#<CSV::Row "Name":"bat" "Value":3>, #<CSV::Row "Name":"bam" "Value":4>]
  #
  # source://csv//lib/csv/table.rb#788
  def push(*rows); end

  # source://csv//lib/csv/table.rb#223
  def size(*args, **_arg1, &block); end

  # :call-seq:
  #   table.to_a -> array_of_arrays
  #
  # Returns the table as an \Array of \Arrays;
  # the headers are in the first row:
  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   table = CSV.parse(source, headers: true)
  #   table.to_a # => [["Name", "Value"], ["foo", "0"], ["bar", "1"], ["baz", "2"]]
  #
  # source://csv//lib/csv/table.rb#978
  def to_a; end

  # :call-seq:
  #   table.to_csv(**options) -> csv_string
  #
  # Returns the table as \CSV string.
  # See {Options for Generating}[../CSV.html#class-CSV-label-Options+for+Generating].
  #
  # Defaults option +write_headers+ to +true+:
  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   table = CSV.parse(source, headers: true)
  #   table.to_csv # => "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #
  # Omits the headers if option +write_headers+ is given as +false+
  # (see {Option +write_headers+}[../CSV.html#class-CSV-label-Option+write_headers]):
  #   table.to_csv(write_headers: false) # => "foo,0\nbar,1\nbaz,2\n"
  #
  # Limit rows if option +limit+ is given like +2+:
  #   table.to_csv(limit: 2) # => "Name,Value\nfoo,0\nbar,1\n"
  #
  # source://csv//lib/csv/table.rb#1004
  def to_csv(write_headers: T.unsafe(nil), limit: T.unsafe(nil), **options); end

  # :call-seq:
  #   table.to_csv(**options) -> csv_string
  #
  # Returns the table as \CSV string.
  # See {Options for Generating}[../CSV.html#class-CSV-label-Options+for+Generating].
  #
  # Defaults option +write_headers+ to +true+:
  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   table = CSV.parse(source, headers: true)
  #   table.to_csv # => "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #
  # Omits the headers if option +write_headers+ is given as +false+
  # (see {Option +write_headers+}[../CSV.html#class-CSV-label-Option+write_headers]):
  #   table.to_csv(write_headers: false) # => "foo,0\nbar,1\nbaz,2\n"
  #
  # Limit rows if option +limit+ is given like +2+:
  #   table.to_csv(limit: 2) # => "Name,Value\nfoo,0\nbar,1\n"
  #
  # source://csv//lib/csv/table.rb#1015
  def to_s(write_headers: T.unsafe(nil), limit: T.unsafe(nil), **options); end

  # :call-seq:
  #   table.values_at(*indexes) -> array_of_rows
  #   table.values_at(*headers) -> array_of_columns_data
  #
  # If the access mode is <tt>:row</tt> or <tt>:col_or_row</tt>,
  # and each argument is either an \Integer or a \Range,
  # returns rows.
  # Otherwise, returns columns data.
  #
  # In either case, the returned values are in the order
  # specified by the arguments.  Arguments may be repeated.
  #
  # ---
  #
  # Returns rows as an \Array of \CSV::Row objects.
  #
  # No argument:
  #   source = "Name,Value\nfoo,0\nbar,1\nbaz,2\n"
  #   table = CSV.parse(source, headers: true)
  #   table.values_at # => []
  #
  # One index:
  #   values = table.values_at(0)
  #   values # => [#<CSV::Row "Name":"foo" "Value":"0">]
  #
  # Two indexes:
  #   values = table.values_at(2, 0)
  #   values # => [#<CSV::Row "Name":"baz" "Value":"2">, #<CSV::Row "Name":"foo" "Value":"0">]
  #
  # One \Range:
  #   values = table.values_at(1..2)
  #   values # => [#<CSV::Row "Name":"bar" "Value":"1">, #<CSV::Row "Name":"baz" "Value":"2">]
  #
  # \Ranges and indexes:
  #   values = table.values_at(0..1, 1..2, 0, 2)
  #   pp values
  # Output:
  #   [#<CSV::Row "Name":"foo" "Value":"0">,
  #    #<CSV::Row "Name":"bar" "Value":"1">,
  #    #<CSV::Row "Name":"bar" "Value":"1">,
  #    #<CSV::Row "Name":"baz" "Value":"2">,
  #    #<CSV::Row "Name":"foo" "Value":"0">,
  #    #<CSV::Row "Name":"baz" "Value":"2">]
  #
  # ---
  #
  # Returns columns data as row Arrays,
  # each consisting of the specified columns data for that row:
  #   values = table.values_at('Name')
  #   values # => [["foo"], ["bar"], ["baz"]]
  #   values = table.values_at('Value', 'Name')
  #   values # => [["0", "foo"], ["1", "bar"], ["2", "baz"]]
  #
  # source://csv//lib/csv/table.rb#734
  def values_at(*indices_or_headers); end

  protected

  # Internal data format used to compare equality.
  #
  # source://csv//lib/csv/table.rb#217
  def table; end
end

# Note: Don't use this class directly. This is an internal class.
#
# source://csv//lib/csv/writer.rb#8
class CSV::Writer
  # @return [Writer] a new instance of Writer
  #
  # source://csv//lib/csv/writer.rb#16
  def initialize(output, options); end

  # Adds a new row
  #
  # source://csv//lib/csv/writer.rb#31
  def <<(row); end

  # Returns the value of attribute headers.
  #
  # source://csv//lib/csv/writer.rb#14
  def headers; end

  # A CSV::Writer receives an output, prepares the header, format and output.
  # It allows us to write new rows in the object and rewind it.
  #
  # source://csv//lib/csv/writer.rb#13
  def lineno; end

  # Winds back to the beginning
  #
  # source://csv//lib/csv/writer.rb#63
  def rewind; end

  private

  # source://csv//lib/csv/writer.rb#69
  def prepare; end

  # source://csv//lib/csv/writer.rb#105
  def prepare_force_quotes_fields(force_quotes); end

  # source://csv//lib/csv/writer.rb#132
  def prepare_format; end

  # source://csv//lib/csv/writer.rb#77
  def prepare_header; end

  # source://csv//lib/csv/writer.rb#162
  def prepare_output; end

  # source://csv//lib/csv/writer.rb#189
  def quote(field, i); end

  # source://csv//lib/csv/writer.rb#180
  def quote_field(field); end
end

class Object < ::BasicObject
  include ::Kernel
  include ::PP::ObjectMixin

  private

  # source://csv//lib/csv.rb#3011
  def CSV(*args, **options, &block); end
end

# source://csv//lib/csv/core_ext/string.rb#1
class String
  include ::Comparable

  # Equivalent to CSV::parse_line(self, options)
  #
  #   "CSV,data".parse_csv
  #     #=> ["CSV", "data"]
  #
  # source://csv//lib/csv/core_ext/string.rb#6
  def parse_csv(**options); end
end
