Angular Observable: modify data before resolve

I tried to transform data before resolve by such way, but subscriber gets non-transformed data.

@Injectable()
export class OrderService {
getAll(): Observable< Array<Order> > {
let url = 'http://fakeapi.com';
return this.http.get( url )
.pipe(
tap( (data: any) => {
/*
* MAKE DATA TRANSFORMATIONS HERE
*/
}),
catchError( (err: any, caught: Observable<{}>) => {
console.log('error while GET : ' + url);
console.warn(err);
return caught;
})
);
}
}


here is a subscriber:

this._orderService.getAll().subscribe( data => {
this.orders = data;
console.log('\nplanning-overview-page : _orderService.getAll : data ', data);
});

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