/**
 * <vz-playlist> - Container element managing a queue of <vz-video> players.
 *
 * Only one child video is active (visible/playing) at a time.
 * Auto-advances when the current video ends.
 *
 * @example
 * ```html
 * <vz-playlist autoplay loop-playlist>
 *   <vz-video title="Video 1" format="MONO_360">
 *     <source src="video1.mp4" type="video/mp4" />
 *   </vz-video>
 *   <vz-video title="Video 2" format="MONO_FLAT">
 *     <source src="video2.mp4" type="video/mp4" />
 *   </vz-video>
 * </vz-playlist>
 *
 * <!-- With expandable sidebar -->
 * <vz-playlist panel="expandable" autoplay>
 *   ...
 * </vz-playlist>
 * ```
 */
import { HTMLElementBase } from '../core/html-element.js';
export interface PlaylistItem {
    index: number;
    element: HTMLElement;
    title: string;
    format: string;
    poster: string;
}
export declare class VzPlaylistElement extends HTMLElementBase {
    private shadow;
    private items;
    private currentIndex;
    private playlistControls;
    private playlistPanel;
    private endedHandler;
    private connected;
    /**
     * True once a child player reports a license tier without the `playlist`
     * feature. The queue degrades to playing only the first item as a single
     * clip: auto-advance and prev/next navigation are disabled and the multi-item
     * controls/panel are removed.
     */
    private playlistLocked;
    private licenseListener;
    /** Resolved UI strings — the playlist element parses its own `strings` attribute. */
    private strings;
    constructor();
    static get observedAttributes(): string[];
    get autoplay(): boolean;
    set autoplay(val: boolean);
    get loopPlaylist(): boolean;
    set loopPlaylist(val: boolean);
    get panelMode(): 'none' | 'expandable';
    connectedCallback(): void;
    disconnectedCallback(): void;
    attributeChangedCallback(_name: string, _oldVal: string | null, _newVal: string | null): void;
    /** Navigate to item at index */
    goTo(index: number): void;
    /** Go to next item */
    next(): void;
    /** Go to previous item */
    previous(): void;
    /**
     * Graceful downgrade when the tier lacks the playlist feature: keep the first
     * item playing as a single clip and disable everything queue-specific —
     * auto-advance, prev/next, the injected controls, and the side panel.
     */
    private applyPlaylistLock;
    /** Shuffle the playlist order */
    shuffle(): void;
    /** Get current item index */
    get currentItemIndex(): number;
    /** Get total item count */
    get itemCount(): number;
    /** Get the active player element */
    get activeElement(): HTMLElement | null;
    /** Toggle the playlist panel open/closed */
    togglePanel(): void;
    /**
     * The playlist container is not a VzBaseElement (no shared config pipeline),
     * so it parses its own `strings` attribute: a JSON object of partial UI-string
     * overrides. Invalid JSON or a non-object value is warned about and ignored.
     */
    private resolveOwnStrings;
    private parseItems;
    private attachEndedListener;
    private detachEndedListener;
    private injectControls;
    private injectStyles;
}
/** Register the <vz-playlist> custom element */
export declare function registerPlaylist(): void;
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