import type { WorkerFrameTimingStats } from './protocol';
export interface FrameTimingWindowOptions {
    windowMs?: number;
    idleResetMs?: number;
    missedFrameThresholdMs?: number;
}
export declare class FrameTimingWindow {
    #private;
    readonly windowMs: number;
    readonly idleResetMs: number;
    readonly missedFrameThresholdMs: number;
    constructor(options?: FrameTimingWindowOptions);
    add(duration: number, now?: number): WorkerFrameTimingStats;
    snapshot(now?: number): WorkerFrameTimingStats;
    reset(): void;
}