class RuboCop::Cop::Lint::DeprecatedClassMethods

Addrinfo.tcp(host, port).getnameinfo
Addrinfo.getaddrinfo(nodename, service)
ENV # ‘ENV.freeze` cannot prohibit changes to environment variables.
block_given?
Dir.exist?(some_path)
File.exist?(some_path)
# good
@example
Socket.gethostbyaddr(host)
Socket.gethostbyname(host)
ENV.freeze # Calling `Env.freeze` raises `TypeError` since Ruby 2.7.
iterator?
Dir.exists?(some_path)
File.exists?(some_path)
# bad
@example
This cop checks for uses of the deprecated class method usages.

def check(node) 

def check(node)
  DEPRECATED_METHODS_OBJECT.each_key do |deprecated|
    next unless deprecated.class_nodes.include?(node.receiver)
    next unless node.method?(deprecated.method)
    yield deprecated
  end
end

def on_send(node) 

def on_send(node)
  check(node) do |deprecated|
    prefer = replacement(deprecated)
    message = format(MSG, current: deprecated, prefer: prefer)
    current_method = node.loc.selector
    add_offense(current_method, message: message) do |corrector|
      next unless deprecated.correctable?
      if (preferred_method = prefer.method)
        corrector.replace(current_method, preferred_method)
      else
        corrector.remove(node.loc.dot)
        corrector.remove(current_method)
      end
    end
  end
end

def replacement(deprecated) 

def replacement(deprecated)
  DEPRECATED_METHODS_OBJECT[deprecated]
end