/**
 * `lambda` runtime semantics — executable contract for single-expression closures.
 *
 * Scope:
 *   - expression-bodied lambdas only
 *   - normal by-reference capture for outer non-loop bindings
 *   - fresh per-iteration capture for callback loop parameters (the canonical
 *     KERN behavior matching TS callback invocation scope)
 *
 * Multi-statement/block closures are intentionally out of scope for this
 * contract. Fixtures use this node as a semantics wrapper: production emitters
 * see only normal KERN body statements after fixture lowering.
 */
import { type NodeContract } from './index.js';
export declare const lambdaContract: NodeContract;
/** Idempotent registration. Test cleanup that clears the registry must re-call. */
export declare function registerLambdaContract(): void;
/** Reset registration flag — only for test cleanup that clears the registry. */
export declare function _resetLambdaContractForTest(): void;