You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: aws_info.rb
    path of file: ./repos/jets/lib/jets
    
    the code of the file until where you have to start completion: 
module Jets
  class AwsInfo
    extend Memoist
    include AwsServices

    def region
      return 'us-east-1' if Jets.env.test?

      retu
    
    def region
      return 'us-east-1' if Jets.env.test?

      return ENV['JETS_AWS_REGION'] if ENV['JETS_AWS_REGION'] # highest precedence
      return ENV['AWS_REGION'] if ENV['AWS_REGION']

      region = nil

      # First if aws binary is available
      # try to get it from the ~/.aws/config
      if which('aws')
        region = `aws configure get region 2>&1`.strip rescue nil
        exit_code = $?.exitstatus
        if exit_code != 0
          exception_message = region.split("\n").grep(/botocore\.exceptions/).first
          if exception_message
            puts "WARN: #{exception_message}".color(:yellow)
          else
            # show full message as warning
            puts region.color(:yellow)
          end