/** One official-source refresh at a time, fenced by credential generation. */
export declare class QuotaRefreshCoordinator<T> {
    private credentialGeneration;
    private inFlight;
    retireCredentialGeneration(): void;
    isCurrent(credentialGeneration: number): boolean;
    /** The generation a caller should capture BEFORE a cycle to later ask
     * whether a credential change intervened (per-lane pacing reads it). */
    currentGeneration(): number;
    run(start: (credentialGeneration: number) => Promise<T>, followCredentialChanges?: boolean): Promise<T>;
}
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