export type TimerHandle = ReturnType<typeof globalThis.setTimeout> | number;
export interface Clock {
    clearInterval(handle: TimerHandle): void;
    clearTimeout(handle: TimerHandle): void;
    now(): number;
    setInterval(fn: () => void, delayMs: number): TimerHandle;
    setTimeout(fn: () => void, delayMs: number): TimerHandle;
}
export declare class SystemClock implements Clock {
    now(): number;
    setTimeout(fn: () => void, delayMs: number): TimerHandle;
    clearTimeout(handle: TimerHandle): void;
    setInterval(fn: () => void, delayMs: number): TimerHandle;
    clearInterval(handle: TimerHandle): void;
}
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