Argument of type 'unknown[]' is not assignable to parameter of type > 'OperatorFunction

component.ts

initialize() method says

Argument of type 'unknown[]' is not assignable to parameter of type 'OperatorFunction<unknown[], unknown>'. Type 'unknown[]' provides no match for the signature '(source: Observable<unknown[]>): Observable'
​

alertsChanged$: Observable<AlertModel[]>;

private initialize(): void {


this.alertsChanged$ = this.alertsService.getAlerts().pipe(
map((res) => res), // here it returns the above error
tap((res) => {

this.setDataForFilters(res); //Argument of type 'unknown' is not assignable to parameter of type 'AlertModel[]'.

}),
);
}

private setDataForFilters(alerts: AlertModel[]): void {}


service.ts

// no issues here

getAlerts(): Observable<AlertModel[]> {
return this.angularFireDatabase
.list<AlertModel>(`groups/${this.groupId}/alerts`)
.valueChanges()
.pipe(
map((res) => orderBy(res, ['timeStamp'], ['desc'])),
first()
);
}


.html

<app-alerts
[alerts]="alertsChanged$ | async"
></app-alerts>


Please let me the issue here?

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