Используйте обещание в Angular 8
private fetchData(){
const promise = this.httpClient.get(this.apiUrl).toPromise();
console.log(promise);
promise.then((data)=>{
console.log("Promise resolved with: " + JSON.stringify(data));
}, (error)=>{
console.log("Promise rejected with " + JSON.stringify(error));
})
}
Motionless Monkey