class Aws::STS::Plugins::STSRegionalEndpoints

def self.resolve_sts_regional_endpoints(cfg)
  env_mode = ENV['AWS_STS_REGIONAL_ENDPOINTS']
  env_mode = nil if env_mode == ''
  cfg_mode = Aws.shared_config.sts_regional_endpoints(
    profile: cfg.profile)
  env_mode || cfg_mode || 'regional'
end