A conventional way to avoid circular dependencies in both AngularJS and Angular is to get another provider instance in-place and not on provider instantiation:
export class TokenInterceptor implements HttpInterceptor {
constructor(public auth: AuthService, public injector: Injector) {}
intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
const httpClient = injector.get(HttpClient);
...
}
}
Notice that if the interceptor applies to all HttpClient
requests, it will be applied to the one that is done inside the interceptor itself and likely result in infinite recursion. In order to avoid this the request can be marked to skip the interceptor (e.g. via custom header).
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