How to make a synchronous call in angular 5?

This can be simplified by using async/await 🔥🔥

public GetCurrentUserInformation(): Promise<any>{    return this.loginService.GetCurrentUserData().toPromise()}

ngAfterViewInit

async ngAfterViewInit() {            this.responseData = await this.GetCurrentUserInformation(); // 🧙‍♂️         if (this.responseData.code != responseCodes.success) {            this.googleInit();        }    }

Subscribe to GetCurrentUserData() the http call is async (every browser api call is async, because the javascript engine runs in a single thread (google for browser event loop for more, this is not an angular issue))

this.GetCurrentUserInformation().subscribe((data: ResponseData) => {        if (this.responseData.code != responseCodes.success) {            this.googleInit();        }});

Asynchronous functions cannot be called synchronously, because they are asynchronous.

subscribe generally shouldn't performed in methods that are expected to be chained. Even if it should, an observable and not a subscription should be returned from a method (a subscription can be additionally saved to be unsubscribed on destruction).

GetCurrentUserInformation method is redundant because it is just a wrapper for service call. The code can be refactored to:

ngAfterViewInit() {    this.loginService.GetCurrentUserData().subscribe(data => {        this.responseData = data;        if (this.responseData.code != responseCodes.success) {            this.googleInit();        }    });}