/**
 * Searches for files matching a pattern using ripgrep
 *
 * @param cwd - The current working directory from which to execute the search
 * @param searchPath - The path to search within
 * @param pattern - The regex pattern to search for in files
 * @param filePattern - Optional glob pattern to filter which files to search
 * @returns A string containing the search results or 'No matches found' if no results
 * @throws Will throw an error if the ripgrep command fails for reasons other than no matches
 * @example
 * ```typescript
 * // Search for "function" in all TypeScript files in the src directory
 * const results = await searchFiles('/path/to/project', 'src', 'function', '*.ts');
 * ```
 */
export declare function searchFiles(cwd: string, searchPath: string, pattern: string, filePattern?: string): Promise<string>;