import { MilkdownPlugin } from '@milkdown/kit/ctx';
import { Root } from 'mdast';
/**
 * Legacy Brainfish / rich-markdown-editor hard break escape in stored markdown (` \n `).
 * Matches platform `shared/editor/rules/tables.ts` BREAK_REGEX.
 */
export declare const LEGACY_HARD_BREAK_REGEX: RegExp;
type LegacyHardBreakSegment = {
    kind: 'text';
    value: string;
} | {
    kind: 'break';
};
/** Split text on unescaped `\n` sequences; each delimiter becomes a hard break. */
export declare function splitLegacyHardBreaks(value: string): LegacyHardBreakSegment[];
/** Rewrite mdast text nodes containing legacy `\n` into text + `break` siblings. */
export declare function transformLegacyHardBreaks(tree: Root): void;
export declare const remarkLegacyHardBreak: import('@milkdown/utils').$Remark<"brainfish-legacy-hard-break", unknown>;
export declare const legacyHardBreakPlugin: MilkdownPlugin[];
export {};