import type { ReadonlyDeep } from "type-fest";
import { type AnyParams, type AnyValidators, type CacheSpec, type ConsumerDirectives } from "../index.js";
import type { NormalizedProducerResultResource } from "../types/06_Normalization.js";
type AnyNormalizedProducerResultResource = NormalizedProducerResultResource<CacheSpec, AnyValidators, AnyParams>;
/**
 * Returns the moment when the resource's value was generated _by the origin_.
 * This may be different from the date that the NormalizedProducerResultResource
 * was created, if the NormalizedProducerResultResource was created by a cache
 * that had already been holding the origin's result for some time.
 */
export declare function birthDate(it: AnyNormalizedProducerResultResource): Date;
/**
 * Returns the amount of time between the time when the resource was generated
 * _at the origin_ and the provided date.
 */
export declare function age(it: AnyNormalizedProducerResultResource, at: Date): number;
/**
 * How many seconds remain until the entry could not even potentially satisfy
 * an incoming request. This will often be infinite, because the consumer can
 * request arbitrarily stale entries (via maxStale).
 */
export declare function potentiallyUsefulFor(it: AnyNormalizedProducerResultResource, at: Date): number;
/**
 * Returns whether the entry has data that can be used for revalidation.
 */
export declare function isValidatable(it: AnyNormalizedProducerResultResource): boolean;
export declare function isFresh(it: AnyNormalizedProducerResultResource, at: Date): boolean;
export declare const EntryClassification: {
    readonly Usable: "Usable";
    readonly UsableWhileRevalidate: "UsableWhileRevalidate";
    readonly UsableIfError: "UsableIfError";
    readonly Unusable: "Unusable";
};
/**
 * Returns a results applicability/usability, for a set of consumer directives,
 * and at a given date, based on its stored age etc.
 *
 * Note: this does **not** factor in the entry's `id` or `vary` value; its
 * assumed that the entry is a valid candidate for the request's params.
 */
export declare function classify(entry: AnyNormalizedProducerResultResource, consumerDirs: ReadonlyDeep<ConsumerDirectives>, at: Date): "Usable" | "UsableWhileRevalidate" | "UsableIfError" | "Unusable";
export {};
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