import type { ChatMessage } from '../../types/ChatMessage';
import type { ChatParticipant } from '../../types/ChatParticipant';
/**
 * Builds a PDF from the same standalone HTML document used by the HTML chat download.
 *
 * @param title - Title used in the PDF heading and metadata.
 * @param messages - Messages that should be included in the PDF export.
 * @param participants - Participant metadata used by the HTML chat export.
 * @returns Binary data for the generated PDF file.
 *
 * @private Internal helper used by `pdfSaveFormatDefinition`.
 */
export declare function buildChatPdf(title: string, messages: ReadonlyArray<ChatMessage>, participants: ReadonlyArray<ChatParticipant>): Promise<Uint8Array>;