/**
 * Extracts a code snippet from raw unified diff content around a specific line number.
 *
 * @param diffContent - The raw unified diff content (string).
 * @param targetLineNumber - The line number (in the "new" file) to center the snippet around.
 * @param contextLines - The number of lines to include before and after the target line.
 * @returns The extracted code snippet as a string, or an empty string if extraction fails.
 */
export declare function extractDiffSnippet(diffContent: string, targetLineNumber: number, contextLines?: number): string;