import type { IPoolItem, IPoolItemWithStats } from '../types';
import { AbstractPool } from './AbstractPool';
export declare class ColdReserve<TKey, TValue extends IPoolItem> extends AbstractPool<TKey, TValue> implements IPoolItemWithStats {
    readonly agents: Map<TKey, TValue>;
    protected useMain: boolean;
    constructor(agents: Map<TKey, TValue>);
    getNextItem(): TValue;
    /**
     * Switch from main to reserve or vise versa
     * @returns true if reserved agent is now in use
     */
    toggleReserve(): boolean;
    [Symbol.iterator](): Generator<TValue>;
}
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