/**
 * Strip file-diff / modal line gutters (`  12 │ ` / `     │ ± `) so format
 * mode can render real markdown instead of gutter-polluted source.
 * Leaves non-guttered lines unchanged (help, compact cards, tool dumps).
 * For fs.read `N: ` prefixes use {@link extractFsReadFileBody} instead.
 */
export declare function stripPagerLineGutters(body: string): string;
/**
 * Extract clean markdown source from an fs.read tool dump for formatted
 * preview (chat card + pager). Strips:
 *  - `# fs.read path=…` / `# hasMore=…` chrome headers/footers
 *  - `N: ` line-number prefixes the tool adds for model navigation
 *  - optional `Tool fs.read result (…):` wrappers
 */
export declare function extractFsReadFileBody(raw: string): string;
/**
 * Conservative detector: only claim "markdown" when structure is clear.
 * Avoids mangling paths_with_underscores and shell output with * globs.
 */
export declare function looksLikeMarkdown(text: string): boolean;