import type { Logger } from "pino";
export declare const PDF_DEFAULT_MAX_PAGES = 4;
export declare const PDF_DEFAULT_MAX_PIXELS = 4000000;
export declare const PDF_DEFAULT_MIN_TEXT_CHARS = 200;
export type PdfExtractImage = {
    type: "image";
    data: string;
    mimeType: "image/png";
};
export type PdfExtractOptions = {
    maxPages?: number;
    maxPixels?: number;
    minTextChars?: number;
    includeImagesWhenTextMissing?: boolean;
    logger?: Logger;
};
export type PdfExtractResult = {
    text: string;
    images: PdfExtractImage[];
    pagesProcessed: number;
    totalPages: number;
};
/**
 * Extracts PDF text and falls back to page image rendering when text is sparse.
 * Expects: input buffer is a valid PDF payload.
 */
export declare function pdfExtract(buffer: Buffer, options?: PdfExtractOptions): Promise<PdfExtractResult>;
/**
 * Checks whether a buffer starts with a PDF file signature.
 * Expects: any binary payload.
 */
export declare function pdfSignatureIs(data: Buffer): boolean;
//# sourceMappingURL=pdfExtract.d.ts.map