CanDeactivateFn
type-alias
The signature of a function used as a canDeactivate guard on a Route.
type CanDeactivateFn<T> = (component: T, currentRoute: ActivatedRouteSnapshot, currentState: RouterStateSnapshot, nextState?: RouterStateSnapshot) => Observable<boolean | UrlTree> | Promise<boolean | UrlTree> | boolean | UrlTree;See also
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https://v14.angular.io/api/router/CanDeactivateFn