/// <reference types="node" />
/// <reference types="node" />
import "./polyfill";
import type { DocumentInitParameters } from "pdfjs-dist/types/src/display/api";
export type PdfMetadata = {
    Title?: string;
    Author?: string;
    Producer?: string;
    Creator?: string;
    CreationDate?: string;
    ModDate?: string;
};
export type Options = {
    /** For cases where the PDF is encrypted with a password */
    password?: string;
    /** @deprecated scale is not recommended with maxWidth or maxHeight, as scaling is determined by these values instead */
    scale?: number;
    /** document init parameters which are passed to pdfjs.getDocument */
    docInitParams?: Partial<DocumentInitParameters>;
    /** Maximum width of the output image */
    maxWidth?: number;
    /** Maximum height of the output image */
    maxHeight?: number;
    /** If true, maintain aspect ratio when maxWidth or maxHeight are specified. Defaults to true. */
    maintainAspectRatio?: boolean;
};
/**
 * Converts a PDF to a series of images. This returns a `Symbol.asyncIterator`
 *
 * @param input Either (a) the path to a pdf file, or (b) a data url, or (c) a buffer, or (d) a ReadableStream.
 *
 */
export declare function pdf(input: string | Buffer | NodeJS.ReadableStream, options?: Options): Promise<{
    length: number;
    metadata: PdfMetadata;
    [Symbol.asyncIterator](): AsyncIterator<Buffer, void, void>;
}>;