export interface Clock {
    now(): Date;
    sleep(delayMs: number, signal?: AbortSignal): Promise<void>;
}
export interface IdGenerator {
    generate(prefix?: string): string;
}
export declare function createAbortError(reason?: unknown): Error;
export declare function throwIfAborted(signal?: AbortSignal): void;
export declare class SystemClock implements Clock {
    now(): Date;
    sleep(delayMs: number, signal?: AbortSignal): Promise<void>;
}
export declare class RandomIdGenerator implements IdGenerator {
    generate(prefix?: string): string;
}
export declare const systemClock: Clock;
export declare const randomIdGenerator: IdGenerator;
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