export interface CancellableTimer {
    cancel(): void;
}
export interface Clock {
    now(): Date;
    setTimeout(fn: () => void, ms: number): CancellableTimer;
    setInterval(fn: () => void, ms: number): CancellableTimer;
}
export declare class RealClock implements Clock {
    now(): Date;
    setTimeout(fn: () => void, ms: number): CancellableTimer;
    setInterval(fn: () => void, ms: number): CancellableTimer;
}
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