import { Node } from '../parser/types';
import { Checkpoint } from './types';
export { klona as clone } from 'klona/json';
export declare function freeze<T>(input: T): T;
export declare function freezeCheckpoint<Ctx>(checkpoint: Checkpoint<Ctx>): Checkpoint<Ctx>;
export declare function coerceHandler<Ctx, T extends Node = Node>(handler: ((ctx: Ctx, token: T) => Ctx) | null | undefined): (ctx: Ctx, token: T) => Ctx;
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