/**
 * Closure Convention Rules
 * Enforces closure best practices from docs/guide-conventions.md:237-286.
 */
import type { ValidationRule } from '../types.js';
/**
 * Warns on bare $ in stored closures without parameters.
 * Bare $ in stored closures has ambiguous binding - it refers to the
 * pipe value at closure invocation time, not definition time.
 *
 * Detection:
 * - Zero-parameter closures (|| { }) used outside dict context
 * - Body contains bare $ references (VariableNode with name '$')
 *
 * Valid patterns:
 * - Dict closures: [count: ||{ $.items -> .len }]  ($ binds to dict)
 * - Parameterized closures: |x|{ $x }  (explicit params)
 * - Inline blocks: -> { $ * 2 }  (immediate evaluation)
 *
 * References:
 * - docs/guide-conventions.md:251-261
 * - docs/topic-closures.md: Late binding section
 */
export declare const CLOSURE_BARE_DOLLAR: ValidationRule;
/**
 * Enforces braces for complex closure bodies.
 * Simple expressions can use parentheses, but complex bodies need braces.
 *
 * Complex body criteria:
 * - Contains Block (multiple statements)
 * - Contains Conditional
 * - Contains loop constructs
 *
 * Simple bodies (parentheses OK):
 * - Single expression: |x|($x * 2)
 * - Single method chain: |s|($s.trim.lower)
 *
 * Complex bodies (braces required):
 * - Conditionals: |n| { ($n < 1) ? 1 ! ($n * $fact($n - 1)) }
 * - Multiple statements: |x| { $x => $y; $y * 2 }
 *
 * References:
 * - docs/guide-conventions.md:239-249
 */
export declare const CLOSURE_BRACES: ValidationRule;
/**
 * Detects closures created inside sequential collection bodies that may
 * suffer from late binding issues. Closures capture variables by reference,
 * so all closures created in a loop body share the final iteration value.
 *
 * Targets the sequential callables `seq` and `acc`. (`fan`/`filter` execute
 * in parallel, `fold` reduces to a single value, so late-binding pitfalls
 * are less common there.)
 *
 * Solution: Explicit capture per iteration:
 *   [1, 2, 3] -> seq({
 *     $ => $item
 *     || { $item }
 *   })
 */
export declare const CLOSURE_LATE_BINDING: ValidationRule;