import { PdfToPngOptions, PngPageOutput } from './types';
/**
 * Converts a PDF file to PNG images.
 *
 * @param pdfFile - The path to the PDF file or a buffer containing the PDF data.
 * @param props - Optional properties to customize the conversion process.
 * @returns A promise that resolves to an array of PNG page outputs.
 *
 * @throws Will throw an error if invalid pages are requested when `strictPagesToProcess` is true.
 *
 * @example
 * ```typescript
 * const pngPages = await pdfToPng('/path/to/pdf/file.pdf', {
 *   pagesToProcess: [1, 2, 3],
 *   outputFolder: '/path/to/output/folder',
 *   viewportScale: 2.0,
 *   outputFileMaskFunc: (pageNumber) => `custom_name_page_${pageNumber}.png`,
 * });
 * ```
 */
export declare function pdfToPng(pdfFile: string | ArrayBufferLike, props?: PdfToPngOptions): Promise<PngPageOutput[]>;