when call service result res not accept : Array<any>

Question

I work with angular 7 

I create serice as below

service.ts
getLocationData(ids: Array) {
        let observableBatch = [];

      ids.forEach((id) => {

            observableBatch.push(
                  this.http.get('http://192.168.7.45:9200/location/_doc/'+id)
                          .map(res => res ));
        });

        return Observable.forkJoin(observableBatch);
    }

when i call service i get error on definition res as following :

this.partDetailsService.getLocationData(this.LocationIds).subscribe(res : Array => {

}

my problem is res :array give me error as not defined 

so how to solve this problem

res not accept to defined as array on compile time 

so how to solve this problem