How to use the @azure/ms-rest-js.getDefaultProxySettings function in @azure/ms-rest-js

public static getDefaultPipeline(
    credential: ServiceClientCredentials,
    pipelineOptions: NewPipelineOptions = {}
  ): Pipeline {
    // Order is important. Closer to the API at the top & closer to the network at the bottom.
    // The credential's policy factory must appear close to the wire so it can sign any
    // changes made by other factories (like UniqueRequestIDPolicyFactory)
    const retryOptions = pipelineOptions.retryOptions || {};

    const userAgentString: string = SecretsClient.getUserAgentString(pipelineOptions.telemetry);

    const requestPolicyFactories: RequestPolicyFactory[] = [
      proxyPolicy(getDefaultProxySettings((pipelineOptions.proxyOptions || {}).proxySettings)),
      userAgentPolicy({ value: userAgentString }),
      generateClientRequestIdPolicy(),
      deserializationPolicy(), // Default deserializationPolicy is provided by protocol layer
      throttlingRetryPolicy(),
      systemErrorRetryPolicy(),
      exponentialRetryPolicy(
        retryOptions.retryCount,
        retryOptions.retryIntervalInMS,
        RetryConstants.MIN_RETRY_INTERVAL_MS, // Minimum retry interval to prevent frequent retries
        retryOptions.maxRetryDelayInMs
      ),
      redirectPolicy(),
      signingPolicy(credential)
    ];

    return {

public static getDefaultPipeline(
    credential: ServiceClientCredentials,
    pipelineOptions: NewPipelineOptions = {}
  ): Pipeline {
    // Order is important. Closer to the API at the top & closer to the network at the bottom.
    // The credential's policy factory must appear close to the wire so it can sign any
    // changes made by other factories (like UniqueRequestIDPolicyFactory)
    const retryOptions = pipelineOptions.retryOptions || {};

    const userAgentString: string = KeysClient.getUserAgentString(pipelineOptions.telemetry);

    const requestPolicyFactories: RequestPolicyFactory[] = [
      proxyPolicy(getDefaultProxySettings((pipelineOptions.proxyOptions || {}).proxySettings)),
      userAgentPolicy({ value: userAgentString }),
      generateClientRequestIdPolicy(),
      deserializationPolicy(), // Default deserializationPolicy is provided by protocol layer
      throttlingRetryPolicy(),
      systemErrorRetryPolicy(),
      exponentialRetryPolicy(
        retryOptions.retryCount,
        retryOptions.retryIntervalInMS,
        RetryConstants.MIN_RETRY_INTERVAL_MS, // Minimum retry interval to prevent frequent retries
        retryOptions.maxRetryDelayInMs
      ),
      redirectPolicy(),
      signingPolicy(credential)
    ];

    return {