import { KeyType } from './KeyType';
import { RemovalListener } from './RemovalListener';
import { ON_REMOVE, ON_MAINTENANCE } from './symbols';
/**
 * Type not part of the public API, used by caches and their layers as their
 * "base".
 */
export interface CacheSPI<K extends KeyType, V> {
    /**
     * Called when a key is removed from the cache. Intended to be overridden
     * so that the value and removal reason can be modified.
     */
    [ON_REMOVE]?: RemovalListener<K, V>;
    /**
     * Called when maintenance occurs in the cache. Can be used by layers to
     * perform extra tasks during maintenance windows, such as expiring items.
     */
    [ON_MAINTENANCE]?: () => void;
}