Asymmetrik/ngx-starter

import { DestroyRef, Injectable, inject } from '@angular/core';
import { takeUntilDestroyed } from '@angular/core/rxjs-interop';
import { DefaultUrlSerializer, NavigationStart, Router } from '@angular/router';

import { filter, map } from 'rxjs/operators';

@Injectable({
    providedIn: 'root'
})
export class NavigationService {
    readonly #destroyRef = inject(DestroyRef);
    readonly #router = inject(Router);

    #previousUrl = '';

    init() {
        this.#router.events
            .pipe(
                filter((event): event is NavigationStart => event instanceof NavigationStart),
                map((event) => event.url),
                filter(
                    (url) =>
                        !url.includes('/signin') &&
                        !url.includes('/access') &&
                        !url.includes('/eua')
                ),
                takeUntilDestroyed(this.#destroyRef)
            )
            .subscribe((url) => {
                this.#previousUrl = url;
            });
    }

    navigateToPreviousRoute() {
        // parse the query parameters into an object
        const queryParams = new DefaultUrlSerializer().parse(this.#previousUrl).queryParams;
        const extras = { queryParams, replaceUrl: true };

        // strip the query parameters from the URL
        const [urlBase] = this.#previousUrl.split('?');

        // Redirect the user
        this.#router.navigate([urlBase], extras).catch(() => {
            this.#router.navigate(['']);
        });
    }
}