import { Observable } from 'rxjs';
/** Caches a result that is expensive to compute, but cheap to verify. */
export declare function cacheWithValidation<T>(func: () => T, validate: (result: T) => boolean, invalidateSelector?: () => Observable<any>): () => T;
/** Caches a result that is unlikely to change during a microtask. */
export declare function cacheDuringMicrotask<T>(func: () => T, validate: (result: T) => boolean): () => T;