import type { PngPageOutput } from "pdf-to-png-converter";
export interface PdfRenderOptions {
    viewportScale?: number;
}
/**
 * Render PDF pages to in-memory PNG buffers.
 *
 * The converter stays behind a dynamic import so the MCP/retrieval hot path does
 * not initialize PDF.js/canvas unless OCR actually needs PDF rendering. Page
 * rendering is intentionally sequential: the OCR pipeline consumes pages in
 * order and retaining multiple high-resolution canvases concurrently only
 * increases peak memory without improving downstream OCR throughput.
 */
export declare function renderPdfPages(pdfPath: string, options?: PdfRenderOptions): Promise<PngPageOutput[]>;
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