brewman/overlord/src/app/role/role-list-resolver.service.ts

import { Injectable } from '@angular/core';
import { ActivatedRouteSnapshot, Resolve, Router, RouterStateSnapshot } from '@angular/router';
import { Role } from './role';
import { Observable } from 'rxjs/internal/Observable';
import { RoleService } from './role.service';

@Injectable({
  providedIn: 'root',
})
export class RoleListResolver implements Resolve<Role[]> {
  constructor(private ser: RoleService, private router: Router) {}

  resolve(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): Observable<Role[]> {
    return this.ser.list();
  }
}