interface IRestApi don't have metricServerError method

[wlkuro]

I'm trying to import a RestAPI created in another stack and use the metrics method.
Adding a type of interface IRestApi makes the metrics method unavailable

public restApi: IRestApi;
this.restApi = apiGateway.RestApi.fromRestApiId(this,"MyGatewayApi","restApiId");

const api = new cloudwatch.Alarm(this, `api-error-alarm`, {
      alarmName: 'api-error-alarm',
      threshold: 5,
      evaluationPeriods: 1,
      metric: this.restApi.metricServerError()
    });

Is it the correct specification that the Interface IRestAPI has no metricServerError methods?
How can I use the metricServerError method?

[peterwoodworth]

@github-actions proposed-answer Try casting it as a RestApiBase

The following works for me

export class TestingStack extends cdk.Stack {
  public restApi: apigw.RestApiBase;
  constructor(scope: Construct, id: string, props?: cdk.StackProps) {
    super(scope, id, props);

    this.restApi = apigw.RestApi.fromRestApiId(this,"MyGatewayApi","restApiId") as apigw.RestApiBase;
    
    const api = new cw.Alarm(this, `api-error-alarm`, {
      alarmName: 'api-error-alarm',
      threshold: 5,
      evaluationPeriods: 1,
      metric: this.restApi.metricServerError()
    });
  }
}

I've created an issue to track this so that you don't have to explicitly cast in the future.

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