import type { PDFDocumentProxy } from "pdfjs-dist";
/**
 * Detects whether a PDF is likely a scanned document (image-only, no text layer).
 * Samples the first `samplePages` pages and returns true if total text characters
 * are below a threshold, indicating no text layer is present.
 */
export declare function detectScannedPdf(pdfDoc: PDFDocumentProxy, samplePages?: number): Promise<boolean>;
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