/**
 * TypeScript implementation of diff_lines function from the Python version.
 * Converts two text blocks into unified diff format lines.
 */
/**
 * Creates a unified diff of two text blocks, line by line.
 * This is a TypeScript implementation of the Python diff_lines function.
 *
 * @param searchText - Original text
 * @param replaceText - Modified text
 * @returns Array of diff lines, each prefixed with '+', '-', or ' '
 */
export declare function diffLines(searchText: string, replaceText: string): string[];