multiple query at once in firebase

1function doSomething(...){
2    let result1 = [];
3    let result2 = [];
4    admin.firestore().collection('...').where('some condition').get()
5    .then((results: any)=>{
6        results.forEach((element: any)=>{
7            if(some other condition){
8                result1.push(element);
9            }
10    })
11    .catch((error: any)=>{//log the error});
12    admin.firestore().collection('...').where('yet another condition').orderBy(...).get()
13    .then((results: any)=>{
14        results.forEach((element: any)=>{
15            result2.push(func(element))  //func is some manipulation
16    })
17    .catch((error: any)=>{//log the error});
18    return makeCalculation(result1, result2);
19}
20