How to use the @microsoft/microsoft-graph-client/lib/es/middleware/MiddlewareUtil.getRequestHeader function in @microsoft/microsoft-graph-client

public async execute(context: Context): Promise {
    try {
      let sdkVersionValue: string = `mgt/${PACKAGE_VERSION}`;

      sdkVersionValue += ', ' + getRequestHeader(context.request, context.options, 'SdkVersion');

      setRequestHeader(context.request, context.options, 'SdkVersion', sdkVersionValue);
      return await this.nextMiddleware.execute(context);
    } catch (error) {
      throw error;
    }
  }
  /**