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)
  default_mode_value =
    if cfg.respond_to?(:defaults_mode_config_resolver)
      cfg.defaults_mode_config_resolver.resolve(:sts_regional_endpoints)
    end
  env_mode || cfg_mode || default_mode_value || 'regional'
end