Passing down values from multiple Observables

After some more digging into RxJS operators i figured the cleanest solution might be to simply combine concat with toArray:

// import { concat } from 'rxjs';
// import { toArray } from 'rxjs/operators';

concat(
  this.itemService.createItem(item),
  this.itemService.getAllItems())
    .pipe(toArray())
    .subscribe((result: [ItemId, Item[]]) => {
      // result[0] is the ItemId
      // result[1] is the Item[]
    });