/**
 * Internal, finding-free building blocks for `format-md-compact.ts`.
 *
 * Split verbatim from the main module for the file-size cap campaign; the
 * public surface (`formatMdCompact` / `FormatMdCompactOptions`) is re-exported
 * from `format-md-compact.ts`, so importers keep pointing at the same path.
 * This module is imported by both `src/` and `packages/` through that path.
 */
export declare const FENCE_MARKER_RE: RegExp;
export declare const TABLE_ROW_RE: RegExp;
export declare const TABLE_ALIGN_ROW_RE: RegExp;
export declare const ATX_HEADING_RE: RegExp;
export declare const HEADING_LINE_RE: RegExp;
export declare const SETEXT_UNDERLINE_RE: RegExp;
export interface ParsedFrontmatter {
    raw: string;
    description: string | null;
    body: string;
}
export declare function splitFrontmatter(input: string): ParsedFrontmatter;
export declare function isFenceOpenLine(line: string): boolean;
export declare function isFenceCloseLine(line: string, insideFence: boolean): boolean;
export declare function isTableLine(line: string): boolean;
export declare function computeSetextUnderlines(lines: string[]): Set<number>;
export declare function isDecorativeHorizontalRule(line: string): boolean;
export declare function collapseMultiBlanks(lines: string[]): string[];