How to use the @aws-cdk/aws-ec2.AmazonLinuxGeneration function in @aws-cdk/aws-ec2

}
    } else if (props && props.windowsVersion) {
      if (this.hwType !== AmiHardwareType.STANDARD) {
        throw new Error('Windows Server does not support special hardware type');
      } else {
        this.windowsVersion = props.windowsVersion;
      }
    } else {                              // generation not defined in props object
      // always default to Amazon Linux v2 regardless of HW
      this.generation = ec2.AmazonLinuxGeneration.AMAZON_LINUX_2;
    }

    // set the SSM parameter name
    this.amiParameterName = "/aws/service/ecs/optimized-ami/"
      + (this.generation === ec2.AmazonLinuxGeneration.AMAZON_LINUX ? "amazon-linux/" : "")
      + (this.generation === ec2.AmazonLinuxGeneration.AMAZON_LINUX_2 ? "amazon-linux-2/" : "")
      + (this.windowsVersion ? `windows_server/${this.windowsVersion}/english/full/` : "")
      + (this.hwType === AmiHardwareType.GPU ? "gpu/" : "")
      + (this.hwType === AmiHardwareType.ARM ? "arm64/" : "")
      + "recommended/image_id";
  }

this.generation = props.generation;
      }
    } else if (props && props.windowsVersion) {
      if (this.hwType !== AmiHardwareType.STANDARD) {
        throw new Error('Windows Server does not support special hardware type');
      } else {
        this.windowsVersion = props.windowsVersion;
      }
    } else {                              // generation not defined in props object
      // always default to Amazon Linux v2 regardless of HW
      this.generation = ec2.AmazonLinuxGeneration.AMAZON_LINUX_2;
    }

    // set the SSM parameter name
    this.amiParameterName = "/aws/service/ecs/optimized-ami/"
      + (this.generation === ec2.AmazonLinuxGeneration.AMAZON_LINUX ? "amazon-linux/" : "")
      + (this.generation === ec2.AmazonLinuxGeneration.AMAZON_LINUX_2 ? "amazon-linux-2/" : "")
      + (this.windowsVersion ? `windows_server/${this.windowsVersion}/english/full/` : "")
      + (this.hwType === AmiHardwareType.GPU ? "gpu/" : "")
      + (this.hwType === AmiHardwareType.ARM ? "arm64/" : "")
      + "recommended/image_id";
  }