How to use the @aws-cdk/custom-resources.Provider function in @aws-cdk/custom-resources

code: lambda.Code.fromAsset(HANDLER_DIR),
      description: 'onEvent handler for EKS cluster resource provider',
      runtime: HANDLER_RUNTIME,
      handler: 'index.onEvent',
      timeout: Duration.minutes(1)
    });

    const isComplete = new lambda.Function(this, 'IsCompleteHandler', {
      code: lambda.Code.fromAsset(HANDLER_DIR),
      description: 'isComplete handler for EKS cluster resource provider',
      runtime: HANDLER_RUNTIME,
      handler: 'index.isComplete',
      timeout: Duration.minutes(1)
    });

    this.provider = new cr.Provider(this, 'Provider', {
      onEventHandler: onEvent,
      isCompleteHandler: isComplete,
      totalTimeout: Duration.hours(1),
      queryInterval: Duration.minutes(5)
    });

    this.roles = [
      onEvent.role!,
      isComplete.role!,
    ];
  }
}