/**
 * URLStateManager
 *
 * Manages URL parameters for viewer state synchronization
 * Handles parsing and syncing of:
 * - xywh: viewport bounds (x,y,w,h)
 * - r or rotation: rotation angle
 * - cv or canvasIndex: canvas index
 * - target: full target string (canvas#xywh=x,y,w,h)
 * - iiif-content: IIIF content-state token
 */
import { XYWHFragment } from './XYWHFragment';
export interface URLStateParams {
    manifestId?: string;
    canvasId?: string;
    canvasIndex?: number;
    xywh?: string;
    rotation?: number;
    target?: string;
    iiifContent?: string;
}
export interface ContentStateTarget {
    canvasId: string;
    xywh?: string;
}
/**
 * Parse URL hash parameters
 */
export declare function parseURLHash(hash?: string): URLStateParams;
/**
 * Parse target string (canvas#xywh=x,y,w,h)
 */
export declare function parseTarget(target: string): ContentStateTarget | null;
/**
 * Parse IIIF content-state token
 * Decodes base64url and extracts canvas + selector
 */
export declare function parseContentState(token: string): ContentStateTarget | null;
/**
 * Serialize viewport state to URL parameters
 */
export declare function serializeURLState(params: URLStateParams): string;
/**
 * Create target string from canvas ID and xywh
 */
export declare function createTarget(canvasId: string, xywh: XYWHFragment | string): string;