type ClockValue = string | number | Date;
export type ClockSequenceInput = ClockValue | readonly ClockValue[];
export interface FixedClockOptions {
    start?: ClockValue;
    stepMs?: number;
    sequence?: ClockSequenceInput;
}
export interface FixedClockHandle {
    now(): Date;
    advance(ms?: number): Date;
    reset(): void;
    timestamp(): number;
    apply(): () => void;
    restore(): void;
}
export interface DeterministicUlidOptions {
    preset?: readonly string[];
    epochMs?: number;
    incrementMs?: number;
    randomnessSeed?: number;
}
export interface DeterministicUlidHandle {
    issued: readonly string[];
    next(): string;
    reset(): void;
    apply(): () => void;
    restore(): void;
}
export declare function installFixedClock(options?: FixedClockOptions): FixedClockHandle;
export declare function installDeterministicUlids(options?: DeterministicUlidOptions): DeterministicUlidHandle;
export {};
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