/**
 * Naming Convention Rules
 * Enforces snake_case naming for variables, parameters, and dict keys.
 */
import type { ValidationRule } from '../types.js';
/**
 * Validates that variable definitions, parameters, and dict keys use snake_case.
 *
 * Checks definition sites only (not variable usage):
 * - Captures: => $user_name, => $item_list, => $is_valid
 * - Closure params: |user_name, count| { }
 * - Dict keys: [user_name: "Alice", is_active: true]
 *
 * Exceptions:
 * - Single-letter names are valid (common for loop variables)
 * - Quoted-string dict keys (`["maxResults": 10]`) are treated as an
 *   intentional escape for foreign API keys the user does not own
 *   (Gmail's `maxResults`, Stripe's `payment_intent`, etc.). The
 *   `keyForm: 'string'` AST flag (rill ≥0.19.2) distinguishes these
 *   from bare-identifier keys (`[maxResults: 10]`) which still fire.
 *
 * References:
 * - docs/guide-conventions.md:10-53
 */
export declare const NAMING_SNAKE_CASE: ValidationRule;