/**
 * String Handling Convention Rules
 * Enforces string handling best practices from docs/guide-conventions.md:318-352.
 */
import type { ValidationRule } from '../types.js';
/**
 * Enforces .empty method for emptiness checks.
 * Direct string comparison with "" is not idiomatic and may not work
 * correctly in all contexts. Use .empty method instead.
 *
 * Detection:
 * - BinaryExpr with == or != operator
 * - One side is empty string literal ""
 * - Suggests using .empty method
 *
 * Valid patterns:
 * - $str -> .empty (check if empty)
 * - $str -> .empty ? "yes" ! "no" (conditional)
 *
 * Discouraged:
 * - $str == "" (direct comparison)
 * - $str != "" (direct comparison)
 *
 * References:
 * - docs/guide-conventions.md:333-345
 */
export declare const USE_EMPTY_METHOD: ValidationRule;