import { Instant } from '@croct/time';
import { JsonCompatible, JsonValue } from '@croct/json';
/**
 * A cache entry associated with a timestamp.
 */
export type TimestampedCacheEntry<T> = Readonly<{
    /**
     * The cached value.
     */
    value: T;
    /**
     * The cache timestamp.
     *
     * Semantics and usage are implementation-specific.
     */
    timestamp: Instant;
}>;
export declare namespace TimestampedCacheEntry {
    function toJSON<T extends JsonCompatible>(entry: TimestampedCacheEntry<T>): string;
    function fromJSON<T extends JsonValue>(json: string): TimestampedCacheEntry<T>;
}