import { Plugin } from 'prosemirror-state';
import { Node as PMNode } from 'prosemirror-model';
/** Flattens a multi-block document into a single paragraph, keeping marks. */
export declare function flattenToSingleParagraph(doc: PMNode): PMNode;
/**
 * Constrains the document to a single paragraph: Enter is inert, pasted
 * multi-block content is flattened to one line, and any transaction that
 * would still produce extra blocks is rejected.
 */
export declare function singleLinePlugin(): Plugin;