/**
 * `useLensPDF` — React hook that manages all viewer state.
 *
 * Returns everything a consumer needs to render a viewer: context
 * values, fallback adapter, page/zoom/layer/tool state, and
 * computed canvas dimensions. Pass the return value to
 * {@link LensPDFProvider} (or spread into `<LensPDFViewer>`) and
 * you're done — no manual context wiring required.
 *
 * @public
 */
import type { PdfFallbackAdapter, ThemeTokens, ViewerServices } from "../plugin/services";
import type { PageInfo } from "../types";
import type { ViewerHostContextValue } from "./index";
/** Options for {@link useLensPDF}. */
export interface UseLensPDFOptions {
    /** Theme tokens. Merged onto defaults. */
    tokens?: Partial<ThemeTokens>;
    /** Partial wired services — unwired fields auto-filled with no-op defaults. */
    services?: Partial<ViewerServices>;
    /** Initial zoom percentage. Default 100. */
    initialZoom?: number;
    /** Viewer mode. Default "scroll". */
    mode?: "scroll" | "single";
    /** Override pdf.js worker URL. Uses CDN default when omitted. */
    workerSrc?: string;
    /** Initial page number (1-indexed). Default 1. */
    initialPage?: number;
}
/** Full viewer state returned by {@link useLensPDF}. */
export interface UseLensPDFReturn {
    hostValue: ViewerHostContextValue;
    servicesValue: ViewerServices;
    fallback: PdfFallbackAdapter | undefined;
    pageCount: number | null;
    currentPage: number;
    setCurrentPage: (n: number) => void;
    currentPageInfo: PageInfo;
    pages: PageInfo[];
    pageDims: Map<number, {
        widthPts: number;
        heightPts: number;
    }>;
    zoom: number;
    setZoom: (z: number) => void;
    canvasWidth: number;
    canvasHeight: number;
    enabledLayers: Set<number>;
    toggleLayer: (ocgIndex: number) => void;
    setAllLayers: (enabled: boolean) => void;
    hasLayers: boolean;
    activeTool: "none" | "color-picker" | "measure";
    setActiveTool: (t: "none" | "color-picker" | "measure") => void;
    error: string | null;
    setError: (e: string | null) => void;
}
/**
 * Manages all LensPDF viewer state. Pair with `<LensPDFProvider>`
 * or `<LensPDFViewer>` for rendering.
 *
 * ```tsx
 * const viewer = useLensPDF("https://cdn.example.com/proof.pdf");
 * return (
 *   <LensPDFProvider value={viewer}>
 *     <PageCanvas page={viewer.currentPageInfo} zoom={viewer.zoom} ... />
 *   </LensPDFProvider>
 * );
 * ```
 *
 * @public
 */
export declare function useLensPDF(pdfUrl: string | undefined, opts?: UseLensPDFOptions): UseLensPDFReturn;
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