Angular: Append a query parameter to current route without navigating

appendRoute.ts

import { ActivatedRoute, Router, NavigationExtras } from '@angular/router';
...
const extras: NavigationExtras = {
	relativeTo: this.route,
	queryParams: { name: value },
	queryParamsHandling: 'merge'
};
this.router.navigate([], extras).then(() => { /* continue here */ });