/**
 * Scroll depth tracking for autocapture milestone and pageleave modes.
 */
import type { AutocaptureConfig, ScrollDepthConfig } from "./autocapture-types";
export declare const DEFAULT_SCROLL_DEPTH_THRESHOLDS: readonly [25, 50, 75, 100];
export type ScrollRoot = Window | Element;
export interface NormalizedScrollDepth {
    milestones: boolean;
    thresholds: number[];
    pageleave: boolean;
    scroll_root_selector?: string | string[];
}
export declare function normalizeScrollDepth(raw: ScrollDepthConfig | undefined): NormalizedScrollDepth | null;
export declare function scrollDepthModeActive(config: AutocaptureConfig | undefined): boolean;
export declare function computeScrollDepthPct(root: ScrollRoot | null): number;
export declare function resolveScrollRoot(selectors: string | string[] | undefined): ScrollRoot | null;
export type ScrollDepthCaptureFn = (name: string, props: Record<string, unknown>) => void;
export interface ScrollDepthTrackerOptions {
    milestones: boolean;
    pageleave: boolean;
    thresholds: number[];
    scroll_root_selector?: string | string[];
    capture: ScrollDepthCaptureFn;
    isUrlAllowed: () => boolean;
    onPageview: (cb: () => void) => () => void;
}
export declare class ScrollDepthTracker {
    private readonly _options;
    private _maxPctSeen;
    private readonly _firedThresholds;
    private _scrollHandler;
    private _scrollTarget;
    private _rafId;
    private _pageviewUnsub;
    constructor(_options: ScrollDepthTrackerOptions);
    start(): void;
    stop(): void;
    reset(): void;
    getMaxPct(): number;
    private _scheduleScrollUpdate;
    private _onScroll;
}