Function fireActivationStart

packages/router/src/operators/check_guards.ts:121–129

* This should fire off `ActivationStart` events for each route being activated at this * level. * In other words, if you're activating `a` and `b` below, `path` will contain the * `ActivatedRouteSnapshot`s for both and we will fire `ActivationStart` for both. Always * return * `true` so checks

(
  snapshot: ActivatedRouteSnapshot | null,
  forwardEvent?: (evt: Event) => void,
)

 * `true` so checks continue to run.
 */
function fireActivationStart(
  snapshot: ActivatedRouteSnapshot | null,
  forwardEvent?: (evt: Event) => void,
): Observable<boolean> {
  if (snapshot !== null && forwardEvent) {
    forwardEvent(new ActivationStart(snapshot));
  }
  return of(true);
}

/**
 * This should fire off `ChildActivationStart` events for each route being activated at this