export type SlideImageFormat = 'png' | 'jpg';
export interface ExtractPdfSlidesInput {
    /** Absolute or cwd-relative path to the source PDF. */
    pdfPath: string;
    /** Directory to write the rendered slide images into. */
    outputDir: string;
    /** Image encoding (default: 'png'). */
    format?: SlideImageFormat;
    /**
     * Render scale relative to the PDF's native point size (default: 2.0).
     *
     * pdfjs renders at 72 DPI when scale=1. The Python default of 200 DPI maps
     * to scale ≈ 2.78; we default to 2.0 (≈144 DPI) for a sensible balance of
     * fidelity vs. file size, overridable per call.
     */
    scale?: number;
    /** Skip rendering + file writes; return page metadata only. */
    dryRun?: boolean;
}
export interface ExtractedPdfPage {
    /** 1-based page index (mirrors the Python `slide_NNN` naming). */
    index: number;
    /** Path to the rendered image (empty string on dry-run). */
    path: string;
    /** Rendered pixel width (= native width × scale). */
    width: number;
    /** Rendered pixel height (= native height × scale). */
    height: number;
}
export interface ExtractPdfSlidesResult {
    pages: ExtractedPdfPage[];
}
/** `slide_001.png` — zero-padded to 3 digits to match the Python pipeline. */
export declare function slideImageFilename(index: number, format: SlideImageFormat): string;
/**
 * Render each page of a PDF to an image. Returns per-page metadata.
 *
 * On `dryRun`, the PDF is still opened (so page count + dimensions are real),
 * but no canvas is rendered and no file is written; each page's `path` is the
 * empty string.
 *
 * Throws `VclawError('pdf_parse_failed', ...)` if the document cannot be
 * parsed or a page cannot be rendered.
 */
export declare function extractPdfSlides(input: ExtractPdfSlidesInput): Promise<ExtractPdfSlidesResult>;
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