/**
 * Pure, DOM-free chapter helpers. Extracted so the seek-bar marker math and the
 * active-chapter tracking that drives `vz-chapter-change` can be unit-tested
 * without a renderer or a real media element.
 */
export interface PlayerChapter {
    id: string;
    title: string;
    /** Start offset in seconds. Chapters are contiguous (end = next start). */
    startTime: number;
    sortOrder: number;
}
export interface ChapterMarker {
    id: string;
    title: string;
    startTime: number;
    /** Fractional position along the seek bar in [0, 1]. */
    position: number;
}
/** A chapter as parsed from the DOM/delivery, before ids/order are normalized. */
export interface RawChapter {
    id?: string | null;
    title: string;
    startTime: number;
    sortOrder?: number | null;
}
/**
 * Turn raw parsed chapters (from `<vz-chapter>` children or a delivery config)
 * into a sorted, fully-populated list: sort by startTime, then fill any missing
 * id with a stable `chapter-<n>` index and default sortOrder from position.
 */
export declare function normalizeChapters(raw: RawChapter[]): PlayerChapter[];
/** Return a new array sorted by startTime ascending (input untouched). */
export declare function sortChapters(chapters: PlayerChapter[]): PlayerChapter[];
/**
 * The chapter active at `currentTime`: the last chapter whose startTime is at or
 * before it (chapters are contiguous). Returns null when the time precedes the
 * first chapter or the list is empty. Accepts unsorted input.
 */
export declare function resolveActiveChapter(chapters: PlayerChapter[], currentTime: number): PlayerChapter | null;
/**
 * Map each chapter to a fractional seek-bar position (startTime / duration),
 * clamped to [0, 1] and sorted by startTime. Returns [] until the duration is
 * known (0 or negative), so callers can re-run when `duration` resolves.
 */
export declare function chapterMarkerPositions(chapters: PlayerChapter[], duration: number): ChapterMarker[];
//# sourceMappingURL=chapter-logic.d.ts.map