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import { WorkboxPlugin } from 'workbox-core/types.js';
import './_version.js';
export interface ExpirationPluginOptions {
maxEntries?: number;
maxAgeSeconds?: number;
matchOptions?: CacheQueryOptions;
purgeOnQuotaError?: boolean;
}
/**
* This plugin can be used in a `workbox-strategy` to regularly enforce a
* limit on the age and / or the number of cached requests.
*
* It can only be used with `workbox-strategy` instances that have a
* [custom `cacheName` property set](/web/tools/workbox/guides/configure-workbox#custom_cache_names_in_strategies).
* In other words, it can't be used to expire entries in strategy that uses the
* default runtime cache name.
*
* Whenever a cached response is used or updated, this plugin will look
* at the associated cache and remove any old or extra responses.
*
* When using `maxAgeSeconds`, responses may be used *once* after expiring
* because the expiration clean up will not have occurred until *after* the
* cached response has been used. If the response has a "Date" header, then
* a light weight expiration check is performed and the response will not be
* used immediately.
*
* When using `maxEntries`, the entry least-recently requested will be removed
* from the cache first.
*
* @memberof workbox-expiration
*/
declare class ExpirationPlugin implements WorkboxPlugin {
private readonly _config;
private readonly _maxAgeSeconds?;
private _cacheExpirations;
/**
* @param {ExpirationPluginOptions} config
* @param {number} [config.maxEntries] The maximum number of entries to cache.
* Entries used the least will be removed as the maximum is reached.
* @param {number} [config.maxAgeSeconds] The maximum age of an entry before
* it's treated as stale and removed.
* @param {Object} [config.matchOptions] The [`CacheQueryOptions`](https://developer.mozilla.org/en-US/docs/Web/API/Cache/delete#Parameters)
* that will be used when calling `delete()` on the cache.
* @param {boolean} [config.purgeOnQuotaError] Whether to opt this cache in to
* automatic deletion if the available storage quota has been exceeded.
*/
constructor(config?: ExpirationPluginOptions);
/**
* A simple helper method to return a CacheExpiration instance for a given
* cache name.
*
* @param {string} cacheName
* @return {CacheExpiration}
*
* @private
*/
private _getCacheExpiration;
/**
* A "lifecycle" callback that will be triggered automatically by the
* `workbox-strategies` handlers when a `Response` is about to be returned
* from a [Cache](https://developer.mozilla.org/en-US/docs/Web/API/Cache) to
* the handler. It allows the `Response` to be inspected for freshness and
* prevents it from being used if the `Response`'s `Date` header value is
* older than the configured `maxAgeSeconds`.
*
* @param {Object} options
* @param {string} options.cacheName Name of the cache the response is in.
* @param {Response} options.cachedResponse The `Response` object that's been
* read from a cache and whose freshness should be checked.
* @return {Response} Either the `cachedResponse`, if it's
* fresh, or `null` if the `Response` is older than `maxAgeSeconds`.
*
* @private
*/
cachedResponseWillBeUsed: WorkboxPlugin['cachedResponseWillBeUsed'];
/**
* @param {Response} cachedResponse
* @return {boolean}
*
* @private
*/
private _isResponseDateFresh;
/**
* This method will extract the data header and parse it into a useful
* value.
*
* @param {Response} cachedResponse
* @return {number|null}
*
* @private
*/
private _getDateHeaderTimestamp;
/**
* A "lifecycle" callback that will be triggered automatically by the
* `workbox-strategies` handlers when an entry is added to a cache.
*
* @param {Object} options
* @param {string} options.cacheName Name of the cache that was updated.
* @param {string} options.request The Request for the cached entry.
*
* @private
*/
cacheDidUpdate: WorkboxPlugin['cacheDidUpdate'];
/**
* This is a helper method that performs two operations:
*
* - Deletes *all* the underlying Cache instances associated with this plugin
* instance, by calling caches.delete() on your behalf.
* - Deletes the metadata from IndexedDB used to keep track of expiration
* details for each Cache instance.
*
* When using cache expiration, calling this method is preferable to calling
* `caches.delete()` directly, since this will ensure that the IndexedDB
* metadata is also cleanly removed and open IndexedDB instances are deleted.
*
* Note that if you're *not* using cache expiration for a given cache, calling
* `caches.delete()` and passing in the cache's name should be sufficient.
* There is no Workbox-specific method needed for cleanup in that case.
*/
deleteCacheAndMetadata(): Promise<void>;
}
export { ExpirationPlugin };