import type { TransformFrame, TransformOutput } from "../transform.types.js";
/**
 * Hson pipeline, stage 2: choose an output representation.
 *
 * Given a normalized frame from stage 1, this stage materializes one of the
 * supported output forms:
 * - `toHtml()`
 * - `toJson()`
 * - `toHson()`
 *
 * Each `toX()` call stores the chosen representation on the frame and returns
 * the merged stage-3 / stage-4 surface. Hson is serialization-only at that
 * stage; canonical graph access is the source-level `toNode()` terminal.
 *
 * LiveTree construction is handled separately by the `hson.liveTree` facade.
 *
 * @param frame - Normalized frame from stage 1.
 * @returns Stage-2 output-selection API.
 */
export declare function construct_output_2(frame: TransformFrame): TransformOutput;
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