import type { PDFDocument } from 'pdf-lib';
export interface Meta {
    title?: string;
    lang?: string;
    subject?: string;
    author?: string;
    keywords?: string[] | string;
    creator?: string;
    producer?: string;
    creationDate?: Date | string;
    modDate?: Date | string;
    [tag: string]: unknown;
}
export declare function setMetadata(pdfDoc: PDFDocument, meta: Meta): void;