import type { IPoolItem } from '../types';
export interface IStats {
    free: number;
    queued: number;
    running: number;
    size: number;
}
export type TContinuationFn<TInstance> = (instance: TInstance) => unknown;
/**
 * AbstractPool
 */
export declare abstract class AbstractPool<TKey, TValue extends IPoolItem> {
    protected readonly agents: Map<TKey, TValue>;
    constructor(agents: Map<TKey, TValue>);
    protected queue: TContinuationFn<TValue>[];
    protected poolStats: IStats;
    get stats(): IStats;
    get load(): number;
    abstract getNextItem(...args: unknown[]): TValue;
    abstract [Symbol.iterator](...args: unknown[]): Generator<TValue>;
    getItemByKey(key: TKey): TValue | undefined;
    enqueue<F extends TContinuationFn<TValue>>(continuation: F): void;
    drain(): void;
    execAsync<F extends TContinuationFn<TValue>>(continuation: F, ...args: unknown[]): Promise<ReturnType<F>>;
}
//# sourceMappingURL=AbstractPool.d.ts.map