How to use the @aws-sdk/config-resolver.resolveRegionConfig function in @aws-sdk/config-resolver

constructor(configuration: RDSDataClientConfig) {
    let _config_0 = {
      ...__ClientDefaultValues,
      ...configuration
    };
    let _config_1 = resolveRegionConfig(_config_0);
    let _config_2 = resolveAwsAuthConfig(_config_1);
    let _config_3 = resolveEndpointsConfig(_config_2);
    let _config_4 = resolveRetryConfig(_config_3);
    let _config_5 = resolveUserAgentConfig(_config_4);
    super(_config_5);
    this.config = _config_5;
    this.middlewareStack.use(getAwsAuthPlugin(this.config));
    this.middlewareStack.use(getRetryPlugin(this.config));
    this.middlewareStack.use(getUserAgentPlugin(this.config));
    this.middlewareStack.use(getContentLengthPlugin(this.config));
  }