get-full-tree-params.ts

import { ActivatedRouteSnapshot } from '@angular/router';

export function getFullTreeParams(route: ActivatedRouteSnapshot, params = {}) {
  if (route) {
    params = {...params, ...route.params};
  }
  return route.firstChild
    ? this.getFullTreeParams(route.firstChild, params)
    : params;
}