export interface TimerBackend {
    now(): number;
    setTimer(fn: () => void, delayMs: number): NodeJS.Timeout;
    clearTimer(handle: NodeJS.Timeout): void;
}
export declare class PrecisionTimer {
    private readonly backend;
    private readonly pending;
    constructor(backend?: TimerBackend);
    now(): number;
    schedule(runAt: Date, fn: () => void): void;
    cancelAll(): void;
    get pendingCount(): number;
}