/**
 * QueryRouter (v2.18)
 *
 * Pick a read replica from candidates. Strategies: round-robin / random / least-loaded.
 * For v2.18, 'least-loaded' is a stub (returns first) — v2.19+ pulls from MetricsRegistry.
 */
export type ReadRouting = 'round-robin' | 'random' | 'least-loaded';
export declare class QueryRouter {
    readonly routing: ReadRouting;
    private rrCounter;
    constructor(routing: ReadRouting);
    pickReadReplica<T extends {
        profile: {
            role: string;
        };
    }>(candidates: T[]): T | null;
}
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