/**
 * Substack's document format back to markdown.
 *
 * Without this, reading a draft gives you a wall of ProseMirror JSON. A model
 * then has to reconstruct the whole document to change one sentence, and
 * usually flattens the formatting doing it.
 *
 * With it, `get_draft` returns readable markdown, the model edits the part it
 * was asked to change, and `update_draft` parses it straight back. Round trip.
 */
import type { PMDoc } from "./prosemirror.js";
export declare function docToMarkdown(document: PMDoc): string;