RXJS 6: new version of HttpInterceptor

Question

I am in the process of adding rxjs_compat to my project in order to move to v6 of libraries.

However the existing HttpInterceptor for global error handling no longer compiles. Not sure where to go with it. Tried all sorts. Getting type mismatches with everything tried.

import { Injectable } from "@angular/core";
import {
  HttpEvent,
  HttpInterceptor,
  HttpHandler,
  HttpRequest,
  HttpResponse,
  HttpErrorResponse
} from "@angular/common/http";
import { Observable, of, empty } from "rxjs";
import { ToastrService } from "ngx-toastr";
import { environment } from "../../environments/environment";
import { catchError, map } from "rxjs/operators";

@Injectable()
export class HttpErrorInterceptor implements HttpInterceptor {
  constructor(private toastr: ToastrService) {}
  intercept(
    request: HttpRequest<any>,
    next: HttpHandler
  ): Observable<HttpEvent<any>> {
    return next.handle(request).pipe(
      catchError(err => of(HttpErrorResponse)),
      map(err => {
        let message: string;
         this.toastr.error(`${message}`, "Application Error");
        return Observable.empty<HttpEvent<any>>();
      })
    );
  }
}

src/app/shared/http-error-interceptor.ts(26,27): error TS2339: Property 'empty' does not exist on type 'typeof Observable'.

empty is now a constant, but doesn't accept a type, so that does not work either. Also could not find much in the upgrade notes

EDIT

although interestingly this compiles:

return Observable.of<HttpEvent<any>>();

Answer 1

1. import {EMPTY} from 'rxjs';

2. Replace return Observable.empty() with

   return EMPTY;