import { AbsoluteExpirationPolicy, AbsoluteExpirationPolicyArgumentsBundle } from './absolute';
import { EntryValidity } from '../../contracts/cache-replacement-policy';
import { GarbageCollector } from '../../garbage-collectors/interface';
import { ExpirableCacheEntry } from './abstract';
/**
 * Expiration policy which evicts keys on it's behalf in the background. <br/>
 * Expired keys are tracked with the help of {@link GarbageCollector}, which evicts them asynchronously when they expire. <br/>
 * This kind of policy can be used if you have keys that won't be often queried
 * and you need a background timer which evicts keys as soon as they expire.
 *
 * @template Key				Type of the key.
 * @template Value				Type of the value.
 * @template ArgumentsBundle	Type of the arguments bundle.
 */
declare class ProactiveExpirationPolicy<Key, Value, ArgumentsBundle extends AbsoluteExpirationPolicyArgumentsBundle = AbsoluteExpirationPolicyArgumentsBundle> extends AbsoluteExpirationPolicy<Key, Value, ArgumentsBundle> {
    private readonly gc;
    /**
     * @param gc	{@link GarbageCollector} which notifies about expired entries. <br/>
     * 				Defaults to {@link HeapGarbageCollector}.
     */
    constructor(gc?: GarbageCollector<any>);
    /**
     * Get the number of tracked for expiration keys.
     */
    get size(): number;
    /**
     * @inheritDoc
     */
    onHit(): EntryValidity;
    /**
     * @inheritDoc
     */
    onSet(entry: ExpirableCacheEntry<Key, Value>, options?: ArgumentsBundle): void;
    /**
     * @inheritDoc
     */
    onUpdate(entry: ExpirableCacheEntry<Key, Value>, options?: ArgumentsBundle): void;
    /**
     * @inheritDoc
     */
    onDelete(entry: ExpirableCacheEntry<Key, Value>): void;
    /**
     * @inheritDoc
     */
    onClear(): void;
    /**
     * **Method used for unit testing purposes!**
     */
    isIdle(): boolean;
}
export { ProactiveExpirationPolicy };