export declare class MomentumTicker {
    private readonly onRepaint;
    private running;
    private smoothedRate;
    private lastSampleMs;
    private pendingChars;
    private lastRepaintMs;
    constructor(onRepaint?: (rate: number | null) => void);
    start(): void;
    update(charCount: number): void;
    getCurrentRate(): number | null;
    stop(): void;
}