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import '../_version.js';
/**
* Returns the timestamp model.
*
* @private
*/
declare class CacheTimestampsModel {
private readonly _cacheName;
private _db;
/**
*
* @param {string} cacheName
*
* @private
*/
constructor(cacheName: string);
/**
* Performs an upgrade of indexedDB.
*
* @param {IDBPDatabase<CacheDbSchema>} db
*
* @private
*/
private _upgradeDb;
/**
* Performs an upgrade of indexedDB and deletes deprecated DBs.
*
* @param {IDBPDatabase<CacheDbSchema>} db
*
* @private
*/
private _upgradeDbAndDeleteOldDbs;
/**
* @param {string} url
* @param {number} timestamp
*
* @private
*/
setTimestamp(url: string, timestamp: number): Promise<void>;
/**
* Returns the timestamp stored for a given URL.
*
* @param {string} url
* @return {number | undefined}
*
* @private
*/
getTimestamp(url: string): Promise<number | undefined>;
/**
* Iterates through all the entries in the object store (from newest to
* oldest) and removes entries once either `maxCount` is reached or the
* entry's timestamp is less than `minTimestamp`.
*
* @param {number} minTimestamp
* @param {number} maxCount
* @return {Array<string>}
*
* @private
*/
expireEntries(minTimestamp: number, maxCount?: number): Promise<string[]>;
/**
* Takes a URL and returns an ID that will be unique in the object store.
*
* @param {string} url
* @return {string}
*
* @private
*/
private _getId;
/**
* Returns an open connection to the database.
*
* @private
*/
private getDb;
}
export { CacheTimestampsModel };