import type { ImageFilters } from '../types/filters';
import type { ViewBox } from '../types/viewer';
export declare class ViewportState {
    manifestId: string;
    selectedCanvasIndex: number;
    viewBox: ViewBox | null;
    imageFilters: ImageFilters;
    constructor(init?: {
        manifestId?: string;
        selectedCanvasIndex?: number;
        viewBox?: ViewBox | null;
        imageFilters?: ImageFilters;
    });
}
export declare const VIEWPORT_STATE_CONTEXT_KEY = "viewport-state";