/// <reference types="react" />
/**
 * The dates each record was fetched at, index by record identifier
 *
 * @example
 * {
 *      12: new Date('2019-02-06T21:23:07.049Z'),
 *      34: new Date('2019-02-06T21:23:07.049Z'),
 * }
 */
interface FetchedOutDates {
    [key: string]: Date;
    [key: number]: Date;
}
/**
 * Returns a list of fetch dates by record id
 *
 * Given a list of new record ids and a previous list of fetch dates by record id,
 * add the new record ids at the current date,
 * and removes those among the old record ids that are stale.
 *
 * @param newRecordIds an array of record identifiers, e.g. [34, 56]
 * @param oldRecordFetchedAt the fetch dates of old records, e.g. { 12: new Date('12 minutes ago), 34: new Date('5 minutes ago') }
 * @param now Current time (useful for tests)
 * @param cacheDuration How long until an old record is removed from the list
 */
declare const getFetchedAt: (newRecordIds?: import("react").ReactText[], oldRecordFetchedAt?: FetchedOutDates, now?: Date, cacheDuration?: number) => FetchedOutDates;
export default getFetchedAt;