/**
 * `@printwithsynergy/lens-pdf/fallback-pdfjs`
 *
 * In-browser PDF fallback adapter built on pdf.js. Provides "minimum
 * data" (page count, dimensions, page rasters, OCG layers, RGB color
 * sampling) for the fallback-capable tools when a host hasn't wired
 * richer services.
 *
 * Distinct from the deprecated `createPdfJsFallback` re-export in
 * `/host`: this subpath imports `pdfjs-dist` statically, so bundlers
 * trace it correctly without the host having to side-effect-import
 * the dep themselves. Hosts that never use the fallback never import
 * this subpath and never pay the bundle cost.
 *
 * ```ts
 * import { createPdfJsFallback } from "@printwithsynergy/lens-pdf/fallback-pdfjs";
 * const fallback = createPdfJsFallback({ pdfUrl: "/proofs/abc.pdf" });
 * ```
 *
 * Usually you don't import this directly — `<LensPDFViewer>` uses
 * it internally and is the one-liner most hosts want.
 *
 * **Security**: this adapter fetches whatever URL the host hands it.
 * Sign / scope / expire the URL the same way you would any other PDF
 * download — the viewer is a pure renderer and trusts the host to
 * enforce access control upstream.
 *
 * @public
 */
import type { PdfFallbackAdapter } from "../plugin/services";
declare module "pdfjs-dist/legacy/build/pdf.mjs";
/**
 * Default URL for the pdf.js worker, served via unpkg pinned to the
 * exact `pdfjs-dist` version this package was built against. Points at
 * the **legacy** build (`legacy/build/pdf.worker.min.mjs`) to match the
 * legacy main-thread import above — both must be the same build so the
 * worker carries the `getOrInsertComputed` polyfill and the API/Worker
 * versions agree. Hosts that don't want a runtime CDN dep can override
 * via the `workerSrc` option, set `pdfjs.GlobalWorkerOptions.workerSrc`
 * directly before constructing the adapter, or self-host the file.
 *
 * @public
 */
export declare const defaultPdfWorkerSrc: string;
interface PdfJsFallbackOptions {
    /** Raw PDF URL. Must be reachable from the user's browser. */
    pdfUrl: string;
    /**
     * Optional override for the pdf.js worker URL. Default:
     * {@link defaultPdfWorkerSrc}, an unpkg URL pinned to the bundled
     * pdfjs-dist version.
     */
    workerSrc?: string;
}
/**
 * Build a {@link PdfFallbackAdapter} backed by pdf.js. The returned
 * adapter caches the parsed document and per-page rasters so
 * repeated calls don't re-parse or re-render.
 *
 * @public
 */
export declare function createPdfJsFallback(opts: PdfJsFallbackOptions): PdfFallbackAdapter;
export {};
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