/**
 * Conditional Convention Rules
 * Enforces conventions for conditional expressions.
 */
import type { ValidationRule } from '../types.js';
/**
 * Suggests using ?? for defaults instead of verbose conditionals.
 *
 * The ?? operator is more concise for providing default values:
 *
 * Good (concise default):
 *   $dict.field ?? "default"
 *
 * Avoid (verbose conditional):
 *   $dict.?field ? $dict.field ! "default"
 *
 * This is informational - both patterns work identically.
 *
 * References:
 * - docs/guide-conventions.md:219-234
 */
export declare const USE_DEFAULT_OPERATOR: ValidationRule;
/**
 * Validates that conditional conditions evaluate to boolean.
 *
 * Rill requires explicit boolean conditions in conditionals.
 * The condition in `cond ? then ! else` must evaluate to boolean.
 *
 * Correct (boolean condition):
 *   "hello" -> .contains("ell") ? "found" ! "not found"
 *
 * Incorrect (non-boolean):
 *   "hello" ? "has value" ! "empty"  # strings don't auto-convert to boolean
 *
 * This is a warning because it's likely a bug, not just stylistic.
 *
 * References:
 * - docs/guide-conventions.md:199-215
 */
export declare const CONDITION_TYPE: ValidationRule;