export interface ClockTick {
    monotonicMs: number;
    wallMs: number;
}
export interface ClockLimits {
    maxRoundTripMs: number;
    maxSampleAgeMs: number;
    safetyMarginMs: number;
    maxClockDisagreementMs: number;
    maxRateErrorPpm: number;
}
export declare const DEFAULT_CLOCK_LIMITS: Readonly<ClockLimits>;
/** Process-local evidence only. The fixed authenticated adapter supplies Date; JSON cannot restore a clock. */
export declare class CoordinationClock {
    private readonly tick;
    private sample?;
    private invalid;
    private readonly limits;
    constructor(tick?: () => ClockTick, limits?: ClockLimits);
    start(): ClockTick;
    private fail;
    private elapsed;
    observe(date: string, start: ClockTick): void;
    bounds(): {
        lowerMs: number;
        upperMs: number;
        date: string;
        roundTripMs: number;
        elapsedMs: number;
    };
    requireBefore(expiresAt: string, operationBudgetMs?: number): ReturnType<CoordinationClock["bounds"]>;
    deadline(ttlMs: number): string;
}
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