JezK

Edit File: env.rbs

# 
# ENV is a hash-like accessor for environment variables.
#
# ### Interaction with the Operating System
#
# The ENV object interacts with the operating system's environment variables:
#
# *   When you get the value for a name in ENV, the value is retrieved from
#     among the current environment variables.
# *   When you create or set a name-value pair in ENV, the name and value are
#     immediately set in the environment variables.
# *   When you delete a name-value pair in ENV, it is immediately deleted from
#     the environment variables.
#
#
# ### Names and Values
#
# Generally, a name or value is a String.
#
# #### Valid Names and Values
#
# Each name or value must be one of the following:
#
# *   A String.
# *   An object that responds to #to_str by returning a String, in which case
#     that String will be used as the name or value.
#
#
# #### Invalid Names and Values
#
# A new name:
#
# *   May not be the empty string:
#         ENV[''] = '0'
#         # Raises Errno::EINVAL (Invalid argument - ruby_setenv())
#
# *   May not contain character `"="`:
#         ENV['='] = '0'
#         # Raises Errno::EINVAL (Invalid argument - ruby_setenv(=))
#
#
# A new name or value:
#
# *   May not be a non-String that does not respond to #to_str:
#
#         ENV['foo'] = Object.new
#         # Raises TypeError (no implicit conversion of Object into String)
#         ENV[Object.new] = '0'
#         # Raises TypeError (no implicit conversion of Object into String)
#
# *   May not contain the NUL character `"\0"`:
#
#         ENV['foo'] = "\0"
#         # Raises ArgumentError (bad environment variable value: contains null byte)
#         ENV["\0"] == '0'
#         # Raises ArgumentError (bad environment variable name: contains null byte)
#
# *   May not have an ASCII-incompatible encoding such as UTF-16LE or
#     ISO-2022-JP:
#
#         ENV['foo'] = '0'.force_encoding(Encoding::ISO_2022_JP)
#         # Raises ArgumentError (bad environment variable name: ASCII incompatible encoding: ISO-2022-JP)
#         ENV["foo".force_encoding(Encoding::ISO_2022_JP)] = '0'
#         # Raises ArgumentError (bad environment variable name: ASCII incompatible encoding: ISO-2022-JP)
#
#
# ### About Ordering
#
# ENV enumerates its name/value pairs in the order found in the operating
# system's environment variables. Therefore the ordering of ENV content is
# OS-dependent, and may be indeterminate.
#
# This will be seen in:
# *   A Hash returned by an ENV method.
# *   An Enumerator returned by an ENV method.
# *   An Array returned by ENV.keys, ENV.values, or ENV.to_a.
# *   The String returned by ENV.inspect.
# *   The Array returned by ENV.shift.
# *   The name returned by ENV.key.
#
#
# ### About the Examples
# Some methods in ENV return ENV itself. Typically, there are many environment
# variables. It's not useful to display a large ENV in the examples here, so
# most example snippets begin by resetting the contents of ENV:
# *   ENV.replace replaces ENV with a new collection of entries.
# *   ENV.clear empties ENV.
#
#
# ## What's Here
#
# First, what's elsewhere. Class ENV:
#
# *   Inherits from [class
#     Object](Object.html#class-Object-label-What-27s+Here).
# *   Extends [module
#     Enumerable](Enumerable.html#module-Enumerable-label-What-27s+Here),
#
#
# Here, class ENV provides methods that are useful for:
#
# *   [Querying](#class-ENV-label-Methods+for+Querying)
# *   [Assigning](#class-ENV-label-Methods+for+Assigning)
# *   [Deleting](#class-ENV-label-Methods+for+Deleting)
# *   [Iterating](#class-ENV-label-Methods+for+Iterating)
# *   [Converting](#class-ENV-label-Methods+for+Converting)
# *   [And more ....](#class-ENV-label-More+Methods)
#
#
# ### Methods for Querying
#
#     ::[]
# :       Returns the value for the given environment variable name if it
#         exists:
#
#     ::empty?
# :       Returns whether ENV is empty.
#
#     ::has_value?, ::value?
# :       Returns whether the given value is in ENV.
#
#     ::include?, ::has_key?, ::key?, ::member?
# :       Returns whether the given name is in ENV.
#
#     ::key
# :       Returns the name of the first entry with the given value.
#
#     ::size, ::length
# :       Returns the number of entries.
#
#     ::value?
# :       Returns whether any entry has the given value.
#
#
#
# ### Methods for Assigning
#
#     ::[]=, ::store
# :       Creates, updates, or deletes the named environment variable.
#
#     ::clear
# :       Removes every environment variable; returns ENV:
#
#     ::update, ::merge!
# :       Adds to ENV each key/value pair in the given hash.
#
#     ::replace
# :       Replaces the entire content of the ENV with the name/value pairs in
#         the given hash.
#
#
#
# ### Methods for Deleting
#
#     ::delete
# :       Deletes the named environment variable name if it exists.
#
#     ::delete_if
# :       Deletes entries selected by the block.
#
#     ::keep_if
# :       Deletes entries not selected by the block.
#
#     ::reject!
# :       Similar to #delete_if, but returns `nil` if no change was made.
#
#     ::select!, ::filter!
# :       Deletes entries selected by the block.
#
#     ::shift
# :       Removes and returns the first entry.
#
#
#
# ### Methods for Iterating
#
#     ::each, ::each_pair
# :       Calls the block with each name/value pair.
#
#     ::each_key
# :       Calls the block with each name.
#
#     ::each_value
# :       Calls the block with each value.
#
#
#
# ### Methods for Converting
#
#     ::assoc
# :       Returns a 2-element array containing the name and value of the named
#         environment variable if it exists:
#
#     ::clone
# :       Returns ENV (and issues a warning).
#
#     ::except
# :       Returns a hash of all name/value pairs except those given.
#
#     ::fetch
# :       Returns the value for the given name.
#
#     ::inspect
# :       Returns the contents of ENV as a string.
#
#     ::invert
# :       Returns a hash whose keys are the ENV values, and whose values are the
#         corresponding ENV names.
#
#     ::keys
# :       Returns an array of all names.
#
#     ::rassoc
# :       Returns the name and value of the first found entry that has the given
#         value.
#
#     ::reject
# :       Returns a hash of those entries not rejected by the block.
#
#     ::select, ::filter
# :       Returns a hash of name/value pairs selected by the block.
#
#     ::slice
# :       Returns a hash of the given names and their corresponding values.
#
#     ::to_a
# :       Returns the entries as an array of 2-element Arrays.
#
#     ::to_h
# :       Returns a hash of entries selected by the block.
#
#     ::to_hash
# :       Returns a hash of all entries.
#
#     ::to_s
# :       Returns the string `'ENV'`.
#
#     ::values
# :       Returns all values as an array.
#
#     ::values_at
# :       Returns an array of the values for the given name.
#
#
#
# ### More Methods
#
#     ::dup
# :       Raises an exception.
#
#     ::freeze
# :       Raises an exception.
#
#     ::rehash
# :       Returns `nil`, without modifying ENV.
#
%a{annotate:rdoc:copy:ENV}
class ENVClass
  include Enumerable[[ String, String ]]

# 
  # Returns the value for the environment variable `name` if it exists:
  #     ENV['foo'] = '0'
  #     ENV['foo'] # => "0"
  #
  # Returns `nil` if the named variable does not exist.
  #
  # Raises an exception if `name` is invalid. See [Invalid Names and
  # Values](#class-ENV-label-Invalid+Names+and+Values).
  #
  %a{annotate:rdoc:copy:ENV.[]}
  def []: (String name) -> String?

# 
  # If `name` is the name of an environment variable, returns its value:
  #     ENV['foo'] = '0'
  #     ENV.fetch('foo') # => '0'
  #
  # Otherwise if a block is given (but not a default value), yields `name` to the
  # block and returns the block's return value:
  #     ENV.fetch('foo') { |name| :need_not_return_a_string } # => :need_not_return_a_string
  #
  # Otherwise if a default value is given (but not a block), returns the default
  # value:
  #     ENV.delete('foo')
  #     ENV.fetch('foo', :default_need_not_be_a_string) # => :default_need_not_be_a_string
  #
  # If the environment variable does not exist and both default and block are
  # given, issues a warning ("warning: block supersedes default value argument"),
  # yields `name` to the block, and returns the block's return value:
  #     ENV.fetch('foo', :default) { |name| :block_return } # => :block_return
  #
  # Raises KeyError if `name` is valid, but not found, and neither default value
  # nor block is given:
  #     ENV.fetch('foo') # Raises KeyError (key not found: "foo")
  #
  # Raises an exception if `name` is invalid. See [Invalid Names and
  # Values](#class-ENV-label-Invalid+Names+and+Values).
  #
  %a{annotate:rdoc:copy:ENV.fetch}
  def fetch: (String name) -> String
           | [X] (String name, X default) -> (String | X)
           | [X] (String name) { (String) -> X } -> (String | X)

# 
  # ENV.store is an alias for ENV.[]=.
  #
  # Creates, updates, or deletes the named environment variable, returning the
  # value. Both `name` and `value` may be instances of String. See [Valid Names
  # and Values](#class-ENV-label-Valid+Names+and+Values).
  #
  # *   If the named environment variable does not exist:
  #     *   If `value` is `nil`, does nothing.
  #             ENV.clear
  #             ENV['foo'] = nil # => nil
  #             ENV.include?('foo') # => false
  #             ENV.store('bar', nil) # => nil
  #             ENV.include?('bar') # => false
  #
  #     *   If `value` is not `nil`, creates the environment variable with `name`
  #         and `value`:
  #             # Create 'foo' using ENV.[]=.
  #             ENV['foo'] = '0' # => '0'
  #             ENV['foo'] # => '0'
  #             # Create 'bar' using ENV.store.
  #             ENV.store('bar', '1') # => '1'
  #             ENV['bar'] # => '1'
  #
  #
  # *   If the named environment variable exists:
  #     *   If `value` is not `nil`, updates the environment variable with value
  #         `value`:
  #             # Update 'foo' using ENV.[]=.
  #             ENV['foo'] = '2' # => '2'
  #             ENV['foo'] # => '2'
  #             # Update 'bar' using ENV.store.
  #             ENV.store('bar', '3') # => '3'
  #             ENV['bar'] # => '3'
  #
  #     *   If `value` is `nil`, deletes the environment variable:
  #             # Delete 'foo' using ENV.[]=.
  #             ENV['foo'] = nil # => nil
  #             ENV.include?('foo') # => false
  #             # Delete 'bar' using ENV.store.
  #             ENV.store('bar', nil) # => nil
  #             ENV.include?('bar') # => false
  #
  #
  #
  # Raises an exception if `name` or `value` is invalid. See [Invalid Names and
  # Values](#class-ENV-label-Invalid+Names+and+Values).
  #
  %a{annotate:rdoc:copy:ENV.[]=}
  def []=: (String name, String? value) -> String?

# 
  # Yields each environment variable name and its value as a 2-element Array:
  #     h = {}
  #     ENV.each_pair { |name, value| h[name] = value } # => ENV
  #     h # => {"bar"=>"1", "foo"=>"0"}
  #
  # Returns an Enumerator if no block given:
  #     h = {}
  #     e = ENV.each_pair # => #<Enumerator: {"bar"=>"1", "foo"=>"0"}:each_pair>
  #     e.each { |name, value| h[name] = value } # => ENV
  #     h # => {"bar"=>"1", "foo"=>"0"}
  #
  %a{annotate:rdoc:copy:ENV.each}
  def each: () -> ::Enumerator[[ String, String ], self]
          | () { ([ String, String ]) -> void } -> self

# 
  # Yields each environment variable name and its value as a 2-element Array:
  #     h = {}
  #     ENV.each_pair { |name, value| h[name] = value } # => ENV
  #     h # => {"bar"=>"1", "foo"=>"0"}
  #
  # Returns an Enumerator if no block given:
  #     h = {}
  #     e = ENV.each_pair # => #<Enumerator: {"bar"=>"1", "foo"=>"0"}:each_pair>
  #     e.each { |name, value| h[name] = value } # => ENV
  #     h # => {"bar"=>"1", "foo"=>"0"}
  #
  %a{annotate:rdoc:copy:ENV.each_pair}
  def each_pair: () -> ::Enumerator[[ String, String ], self]
               | () { ([ String, String ]) -> void } -> self

# 
  # Yields each environment variable name:
  #     ENV.replace('foo' => '0', 'bar' => '1') # => ENV
  #     names = []
  #     ENV.each_key { |name| names.push(name) } # => ENV
  #     names # => ["bar", "foo"]
  #
  # Returns an Enumerator if no block given:
  #     e = ENV.each_key # => #<Enumerator: {"bar"=>"1", "foo"=>"0"}:each_key>
  #     names = []
  #     e.each { |name| names.push(name) } # => ENV
  #     names # => ["bar", "foo"]
  #
  %a{annotate:rdoc:copy:ENV.each_key}
  def each_key: () -> ::Enumerator[[ String ], self]
              | () { (String name) -> void } -> self

# 
  # Yields each environment variable value:
  #     ENV.replace('foo' => '0', 'bar' => '1') # => ENV
  #     values = []
  #     ENV.each_value { |value| values.push(value) } # => ENV
  #     values # => ["1", "0"]
  #
  # Returns an Enumerator if no block given:
  #     e = ENV.each_value # => #<Enumerator: {"bar"=>"1", "foo"=>"0"}:each_value>
  #     values = []
  #     e.each { |value| values.push(value) } # => ENV
  #     values # => ["1", "0"]
  #
  %a{annotate:rdoc:copy:ENV.each_value}
  def each_value: () -> ::Enumerator[[ String ], self]
                | () { (String value) -> void } -> self

# 
  # Deletes the environment variable with `name` if it exists and returns its
  # value:
  #     ENV['foo'] = '0'
  #     ENV.delete('foo') # => '0'
  #
  # If a block is not given and the named environment variable does not exist,
  # returns `nil`.
  #
  # If a block given and the environment variable does not exist, yields `name` to
  # the block and returns the value of the block:
  #     ENV.delete('foo') { |name| name * 2 } # => "foofoo"
  #
  # If a block given and the environment variable exists, deletes the environment
  # variable and returns its value (ignoring the block):
  #     ENV['foo'] = '0'
  #     ENV.delete('foo') { |name| raise 'ignored' } # => "0"
  #
  # Raises an exception if `name` is invalid. See [Invalid Names and
  # Values](#class-ENV-label-Invalid+Names+and+Values).
  #
  %a{annotate:rdoc:copy:ENV.delete}
  def delete: (String name) -> String?
            | (String name) { (String) -> String } -> String

# 
  # Yields each environment variable name and its value as a 2-element Array,
  # deleting each environment variable for which the block returns a truthy value,
  # and returning ENV (regardless of whether any deletions):
  #     ENV.replace('foo' => '0', 'bar' => '1', 'baz' => '2')
  #     ENV.delete_if { |name, value| name.start_with?('b') } # => ENV
  #     ENV # => {"foo"=>"0"}
  #     ENV.delete_if { |name, value| name.start_with?('b') } # => ENV
  #
  # Returns an Enumerator if no block given:
  #     ENV.replace('foo' => '0', 'bar' => '1', 'baz' => '2')
  #     e = ENV.delete_if # => #<Enumerator: {"bar"=>"1", "baz"=>"2", "foo"=>"0"}:delete_if!>
  #     e.each { |name, value| name.start_with?('b') } # => ENV
  #     ENV # => {"foo"=>"0"}
  #     e.each { |name, value| name.start_with?('b') } # => ENV
  #
  %a{annotate:rdoc:copy:ENV.delete_if}
  def delete_if: () -> ::Enumerator[[ String, String ], self]
               | () { (String name, String value) -> boolish } -> self

# 
  # Yields each environment variable name and its value as a 2-element Array,
  # deleting each environment variable for which the block returns `false` or
  # `nil`, and returning ENV:
  #     ENV.replace('foo' => '0', 'bar' => '1', 'baz' => '2')
  #     ENV.keep_if { |name, value| name.start_with?('b') } # => ENV
  #     ENV # => {"bar"=>"1", "baz"=>"2"}
  #
  # Returns an Enumerator if no block given:
  #     ENV.replace('foo' => '0', 'bar' => '1', 'baz' => '2')
  #     e = ENV.keep_if # => #<Enumerator: {"bar"=>"1", "baz"=>"2", "foo"=>"0"}:keep_if>
  #     e.each { |name, value| name.start_with?('b') } # => ENV
  #     ENV # => {"bar"=>"1", "baz"=>"2"}
  #
  %a{annotate:rdoc:copy:ENV.keep_if}
  def keep_if: () -> ::Enumerator[[ String, String ], self]
             | () { (String name, String value) -> boolish } -> self

# 
  # Returns a Hash of the given ENV names and their corresponding values:
  #     ENV.replace('foo' => '0', 'bar' => '1', 'baz' => '2', 'bat' => '3')
  #     ENV.slice('foo', 'baz') # => {"foo"=>"0", "baz"=>"2"}
  #     ENV.slice('baz', 'foo') # => {"baz"=>"2", "foo"=>"0"}
  #
  # Raises an exception if any of the `names` is invalid (see [Invalid Names and
  # Values](#class-ENV-label-Invalid+Names+and+Values)):
  #     ENV.slice('foo', 'bar', :bat) # Raises TypeError (no implicit conversion of Symbol into String)
  #
  %a{annotate:rdoc:copy:ENV.slice}
  def slice: (*String names) -> ::Hash[String, String]

# 
  # Returns a hash except the given keys from ENV and their values.
  #
  #     ENV                       #=> {"LANG"=>"en_US.UTF-8", "TERM"=>"xterm-256color", "HOME"=>"/Users/rhc"}
  #     ENV.except("TERM","HOME") #=> {"LANG"=>"en_US.UTF-8"}
  #
  %a{annotate:rdoc:copy:ENV.except}
  def except: (*String names) -> ::Hash[String, String]

# 
  # Removes every environment variable; returns ENV:
  #     ENV.replace('foo' => '0', 'bar' => '1')
  #     ENV.size # => 2
  #     ENV.clear # => ENV
  #     ENV.size # => 0
  #
  %a{annotate:rdoc:copy:ENV.clear}
  def clear: () -> self

# 
  # Yields each environment variable name and its value as a 2-element Array.
  # Returns a Hash whose items are determined by the block. When the block returns
  # a truthy value, the name/value pair is added to the return Hash; otherwise the
  # pair is ignored:
  #     ENV.replace('foo' => '0', 'bar' => '1', 'baz' => '2')
  #     ENV.reject { |name, value| name.start_with?('b') } # => {"foo"=>"0"}
  #
  # Returns an Enumerator if no block given:
  #     e = ENV.reject
  #     e.each { |name, value| name.start_with?('b') } # => {"foo"=>"0"}
  #
  %a{annotate:rdoc:copy:ENV.reject}
  def reject: () -> ::Enumerator[[ String, String ], self]
            | () { (String name, String value) -> boolish } -> self

# 
  # Similar to ENV.delete_if, but returns `nil` if no changes were made.
  #
  # Yields each environment variable name and its value as a 2-element Array,
  # deleting each environment variable for which the block returns a truthy value,
  # and returning ENV (if any deletions) or `nil` (if not):
  #     ENV.replace('foo' => '0', 'bar' => '1', 'baz' => '2')
  #     ENV.reject! { |name, value| name.start_with?('b') } # => ENV
  #     ENV # => {"foo"=>"0"}
  #     ENV.reject! { |name, value| name.start_with?('b') } # => nil
  #
  # Returns an Enumerator if no block given:
  #     ENV.replace('foo' => '0', 'bar' => '1', 'baz' => '2')
  #     e = ENV.reject! # => #<Enumerator: {"bar"=>"1", "baz"=>"2", "foo"=>"0"}:reject!>
  #     e.each { |name, value| name.start_with?('b') } # => ENV
  #     ENV # => {"foo"=>"0"}
  #     e.each { |name, value| name.start_with?('b') } # => nil
  #
  %a{annotate:rdoc:copy:ENV.reject!}
  def reject!: () -> ::Enumerator[[ String, String ], self?]
             | () { (String name, String value) -> boolish } -> self?

# 
  # ENV.filter is an alias for ENV.select.
  #
  # Yields each environment variable name and its value as a 2-element Array,
  # returning a Hash of the names and values for which the block returns a truthy
  # value:
  #     ENV.replace('foo' => '0', 'bar' => '1', 'baz' => '2')
  #     ENV.select { |name, value| name.start_with?('b') } # => {"bar"=>"1", "baz"=>"2"}
  #     ENV.filter { |name, value| name.start_with?('b') } # => {"bar"=>"1", "baz"=>"2"}
  #
  # Returns an Enumerator if no block given:
  #     e = ENV.select # => #<Enumerator: {"bar"=>"1", "baz"=>"2", "foo"=>"0"}:select>
  #     e.each { |name, value | name.start_with?('b') } # => {"bar"=>"1", "baz"=>"2"}
  #     e = ENV.filter # => #<Enumerator: {"bar"=>"1", "baz"=>"2", "foo"=>"0"}:filter>
  #     e.each { |name, value | name.start_with?('b') } # => {"bar"=>"1", "baz"=>"2"}
  #
  %a{annotate:rdoc:copy:ENV.select}
  def select: () -> ::Enumerator[[ String, String ], ::Hash[String, String]]
            | () { (String name, String value) -> boolish } -> ::Hash[String, String]

# 
  # ENV.filter! is an alias for ENV.select!.
  #
  # Yields each environment variable name and its value as a 2-element Array,
  # deleting each entry for which the block returns `false` or `nil`, and
  # returning ENV if any deletions made, or `nil` otherwise:
  #
  #     ENV.replace('foo' => '0', 'bar' => '1', 'baz' => '2')
  #     ENV.select! { |name, value| name.start_with?('b') } # => ENV
  #     ENV # => {"bar"=>"1", "baz"=>"2"}
  #     ENV.select! { |name, value| true } # => nil
  #
  #     ENV.replace('foo' => '0', 'bar' => '1', 'baz' => '2')
  #     ENV.filter! { |name, value| name.start_with?('b') } # => ENV
  #     ENV # => {"bar"=>"1", "baz"=>"2"}
  #     ENV.filter! { |name, value| true } # => nil
  #
  # Returns an Enumerator if no block given:
  #
  #     ENV.replace('foo' => '0', 'bar' => '1', 'baz' => '2')
  #     e = ENV.select! # => #<Enumerator: {"bar"=>"1", "baz"=>"2"}:select!>
  #     e.each { |name, value| name.start_with?('b') } # => ENV
  #     ENV # => {"bar"=>"1", "baz"=>"2"}
  #     e.each { |name, value| true } # => nil
  #
  #     ENV.replace('foo' => '0', 'bar' => '1', 'baz' => '2')
  #     e = ENV.filter! # => #<Enumerator: {"bar"=>"1", "baz"=>"2"}:filter!>
  #     e.each { |name, value| name.start_with?('b') } # => ENV
  #     ENV # => {"bar"=>"1", "baz"=>"2"}
  #     e.each { |name, value| true } # => nil
  #
  %a{annotate:rdoc:copy:ENV.select!}
  def select!: () -> ::Enumerator[[ String, String ], self?]
             | () { (String name, String value) -> boolish } -> self?

# 
  # Removes the first environment variable from ENV and returns a 2-element Array
  # containing its name and value:
  #     ENV.replace('foo' => '0', 'bar' => '1')
  #     ENV.to_hash # => {'bar' => '1', 'foo' => '0'}
  #     ENV.shift # => ['bar', '1']
  #     ENV.to_hash # => {'foo' => '0'}
  #
  # Exactly which environment variable is "first" is OS-dependent. See [About
  # Ordering](#class-ENV-label-About+Ordering).
  #
  # Returns `nil` if the environment is empty.
  #
  %a{annotate:rdoc:copy:ENV.shift}
  def shift: () -> [ String, String ]?

# 
  # Returns a Hash whose keys are the ENV values, and whose values are the
  # corresponding ENV names:
  #     ENV.replace('foo' => '0', 'bar' => '1')
  #     ENV.invert # => {"1"=>"bar", "0"=>"foo"}
  #
  # For a duplicate ENV value, overwrites the hash entry:
  #     ENV.replace('foo' => '0', 'bar' => '0')
  #     ENV.invert # => {"0"=>"foo"}
  #
  # Note that the order of the ENV processing is OS-dependent, which means that
  # the order of overwriting is also OS-dependent. See [About
  # Ordering](#class-ENV-label-About+Ordering).
  #
  %a{annotate:rdoc:copy:ENV.invert}
  def invert: () -> ::Hash[String, String]

# 
  # Replaces the entire content of the environment variables with the name/value
  # pairs in the given `hash`; returns ENV.
  #
  # Replaces the content of ENV with the given pairs:
  #     ENV.replace('foo' => '0', 'bar' => '1') # => ENV
  #     ENV.to_hash # => {"bar"=>"1", "foo"=>"0"}
  #
  # Raises an exception if a name or value is invalid (see [Invalid Names and
  # Values](#class-ENV-label-Invalid+Names+and+Values)):
  #     ENV.replace('foo' => '0', :bar => '1') # Raises TypeError (no implicit conversion of Symbol into String)
  #     ENV.replace('foo' => '0', 'bar' => 1) # Raises TypeError (no implicit conversion of Integer into String)
  #     ENV.to_hash # => {"bar"=>"1", "foo"=>"0"}
  #
  %a{annotate:rdoc:copy:ENV.replace}
  def replace: (Hash[String, String]) -> self

# 
  # ENV.update is an alias for ENV.merge!.
  #
  # Adds to ENV each key/value pair in the given `hash`; returns ENV:
  #     ENV.replace('foo' => '0', 'bar' => '1')
  #     ENV.merge!('baz' => '2', 'bat' => '3') # => {"bar"=>"1", "bat"=>"3", "baz"=>"2", "foo"=>"0"}
  #
  # Deletes the ENV entry for a hash value that is `nil`:
  #     ENV.merge!('baz' => nil, 'bat' => nil) # => {"bar"=>"1", "foo"=>"0"}
  #
  # For an already-existing name, if no block given, overwrites the ENV value:
  #     ENV.merge!('foo' => '4') # => {"bar"=>"1", "foo"=>"4"}
  #
  # For an already-existing name, if block given, yields the name, its ENV value,
  # and its hash value; the block's return value becomes the new name:
  #     ENV.merge!('foo' => '5') { |name, env_val, hash_val | env_val + hash_val } # => {"bar"=>"1", "foo"=>"45"}
  #
  # Raises an exception if a name or value is invalid (see [Invalid Names and
  # Values](#class-ENV-label-Invalid+Names+and+Values));
  #     ENV.replace('foo' => '0', 'bar' => '1')
  #     ENV.merge!('foo' => '6', :bar => '7', 'baz' => '9') # Raises TypeError (no implicit conversion of Symbol into String)
  #     ENV # => {"bar"=>"1", "foo"=>"6"}
  #     ENV.merge!('foo' => '7', 'bar' => 8, 'baz' => '9') # Raises TypeError (no implicit conversion of Integer into String)
  #     ENV # => {"bar"=>"1", "foo"=>"7"}
  #
  # Raises an exception if the block returns an invalid name: (see [Invalid Names
  # and Values](#class-ENV-label-Invalid+Names+and+Values)):
  #     ENV.merge!('bat' => '8', 'foo' => '9') { |name, env_val, hash_val | 10 } # Raises TypeError (no implicit conversion of Integer into String)
  #     ENV # => {"bar"=>"1", "bat"=>"8", "foo"=>"7"}
  #
  # Note that for the exceptions above, hash pairs preceding an invalid name or
  # value are processed normally; those following are ignored.
  #
  %a{annotate:rdoc:copy:ENV.update}
  def update: (Hash[String, String?]) -> self
            | (Hash[String, String?]) { (String name, String env_val, String? hash_val) -> String } -> self

# 
  # (Provided for compatibility with Hash.)
  #
  # Does not modify ENV; returns `nil`.
  #
  %a{annotate:rdoc:copy:ENV.rehash}
  def rehash: () -> nil

# 
  # Returns the contents of ENV as an Array of 2-element Arrays, each of which is
  # a name/value pair:
  #     ENV.replace('foo' => '0', 'bar' => '1')
  #     ENV.to_a # => [["bar", "1"], ["foo", "0"]]
  #
  %a{annotate:rdoc:copy:ENV.to_a}
  def to_a: () -> ::Array[[ String, String ]]

# 
  # Returns String 'ENV':
  #     ENV.to_s # => "ENV"
  #
  %a{annotate:rdoc:copy:ENV.to_s}
  def to_s: () -> "ENV"

# 
  # Returns the name of the first environment variable with `value`, if it exists:
  #     ENV.replace('foo' => '0', 'bar' => '0')
  #     ENV.key('0') # => "foo"
  #
  # The order in which environment variables are examined is OS-dependent. See
  # [About Ordering](#class-ENV-label-About+Ordering).
  #
  # Returns `nil` if there is no such value.
  #
  # Raises an exception if `value` is invalid:
  #     ENV.key(Object.new) # raises TypeError (no implicit conversion of Object into String)
  #
  # See [Invalid Names and Values](#class-ENV-label-Invalid+Names+and+Values).
  #
  %a{annotate:rdoc:copy:ENV.key}
  def key: (String value) -> String?

# 
  # Returns the count of environment variables:
  #     ENV.replace('foo' => '0', 'bar' => '1')
  #     ENV.length # => 2
  #     ENV.size # => 2
  #
  %a{annotate:rdoc:copy:ENV.size}
  def size: () -> Integer

# 
  # Returns `true` when there are no environment variables, `false` otherwise:
  #     ENV.clear
  #     ENV.empty? # => true
  #     ENV['foo'] = '0'
  #     ENV.empty? # => false
  #
  %a{annotate:rdoc:copy:ENV.empty?}
  def empty?: () -> bool

# 
  # Returns all variable names in an Array:
  #     ENV.replace('foo' => '0', 'bar' => '1')
  #     ENV.keys # => ['bar', 'foo']
  #
  # The order of the names is OS-dependent. See [About
  # Ordering](#class-ENV-label-About+Ordering).
  #
  # Returns the empty Array if ENV is empty.
  #
  %a{annotate:rdoc:copy:ENV.keys}
  def keys: () -> ::Array[String]

# 
  # Returns all environment variable values in an Array:
  #     ENV.replace('foo' => '0', 'bar' => '1')
  #     ENV.values # => ['1', '0']
  #
  # The order of the values is OS-dependent. See [About
  # Ordering](#class-ENV-label-About+Ordering).
  #
  # Returns the empty Array if ENV is empty.
  #
  %a{annotate:rdoc:copy:ENV.values}
  def values: () -> ::Array[String]

# 
  # Returns an Array containing the environment variable values associated with
  # the given names:
  #     ENV.replace('foo' => '0', 'bar' => '1', 'baz' => '2')
  #     ENV.values_at('foo', 'baz') # => ["0", "2"]
  #
  # Returns `nil` in the Array for each name that is not an ENV name:
  #     ENV.values_at('foo', 'bat', 'bar', 'bam') # => ["0", nil, "1", nil]
  #
  # Returns an empty Array if no names given.
  #
  # Raises an exception if any name is invalid. See [Invalid Names and
  # Values](#class-ENV-label-Invalid+Names+and+Values).
  #
  %a{annotate:rdoc:copy:ENV.values_at}
  def values_at: (*String names) -> ::Array[String?]

# 
  # ENV.has_key?, ENV.member?, and ENV.key? are aliases for ENV.include?.
  #
  # Returns `true` if there is an environment variable with the given `name`:
  #     ENV.replace('foo' => '0', 'bar' => '1')
  #     ENV.include?('foo') # => true
  #
  # Returns `false` if `name` is a valid String and there is no such environment
  # variable:
  #     ENV.include?('baz') # => false
  #
  # Returns `false` if `name` is the empty String or is a String containing
  # character `'='`:
  #     ENV.include?('') # => false
  #     ENV.include?('=') # => false
  #
  # Raises an exception if `name` is a String containing the NUL character `"\0"`:
  #     ENV.include?("\0") # Raises ArgumentError (bad environment variable name: contains null byte)
  #
  # Raises an exception if `name` has an encoding that is not ASCII-compatible:
  #     ENV.include?("\xa1\xa1".force_encoding(Encoding::UTF_16LE))
  #     # Raises ArgumentError (bad environment variable name: ASCII incompatible encoding: UTF-16LE)
  #
  # Raises an exception if `name` is not a String:
  #     ENV.include?(Object.new) # TypeError (no implicit conversion of Object into String)
  #
  %a{annotate:rdoc:copy:ENV.include?}
  def include?: (String name) -> bool

# 
  # Returns `true` if `value` is the value for some environment variable name,
  # `false` otherwise:
  #     ENV.replace('foo' => '0', 'bar' => '1')
  #     ENV.value?('0') # => true
  #     ENV.has_value?('0') # => true
  #     ENV.value?('2') # => false
  #     ENV.has_value?('2') # => false
  #
  %a{annotate:rdoc:copy:ENV.has_value?}
  def has_value?: (String value) -> bool

# 
  # Returns a Hash containing all name/value pairs from ENV:
  #     ENV.replace('foo' => '0', 'bar' => '1')
  #     ENV.to_hash # => {"bar"=>"1", "foo"=>"0"}
  #
  %a{annotate:rdoc:copy:ENV.to_hash}
  def to_hash: () -> ::Hash[String, String]

# 
  # Returns a 2-element Array containing the name and value of the environment
  # variable for `name` if it exists:
  #     ENV.replace('foo' => '0', 'bar' => '1')
  #     ENV.assoc('foo') # => ['foo', '0']
  #
  # Returns `nil` if `name` is a valid String and there is no such environment
  # variable.
  #
  # Returns `nil` if `name` is the empty String or is a String containing
  # character `'='`.
  #
  # Raises an exception if `name` is a String containing the NUL character `"\0"`:
  #     ENV.assoc("\0") # Raises ArgumentError (bad environment variable name: contains null byte)
  #
  # Raises an exception if `name` has an encoding that is not ASCII-compatible:
  #     ENV.assoc("\xa1\xa1".force_encoding(Encoding::UTF_16LE))
  #     # Raises ArgumentError (bad environment variable name: ASCII incompatible encoding: UTF-16LE)
  #
  # Raises an exception if `name` is not a String:
  #     ENV.assoc(Object.new) # TypeError (no implicit conversion of Object into String)
  #
  %a{annotate:rdoc:copy:ENV.assoc}
  def assoc: (String name) -> [ String, String ]?

# 
  # Returns a 2-element Array containing the name and value of the **first**
  # **found** environment variable that has value `value`, if one exists:
  #     ENV.replace('foo' => '0', 'bar' => '0')
  #     ENV.rassoc('0') # => ["bar", "0"]
  #
  # The order in which environment variables are examined is OS-dependent. See
  # [About Ordering](#class-ENV-label-About+Ordering).
  #
  # Returns `nil` if there is no such environment variable.
  #
  %a{annotate:rdoc:copy:ENV.rassoc}
  def rassoc: (String value) -> [ String, String ]?
end

# 
# ENV is a Hash-like accessor for environment variables.
#
# See ENV (the class) for more details.
#
ENV: ENVClass

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