import type { HsonNode } from "./types.js";
/**
 * Normalize the explicitly supported permissive node-ingress forms without
 * mutating the caller. Shared acyclic references remain shared; cycles fail
 * with the current path and the path where the active reference began.
 */
export declare function normalize_hson_graph(input: HsonNode, where: string): HsonNode;
/**
 * Normalize the sole legacy exact-codec metadata spelling without applying
 * the broader permissive node-ingress coercions. The decoded exact graph is
 * already detached; only affected nodes and their ancestors are copied.
 */
export declare function normalize_empty_hson_metadata(input: HsonNode): HsonNode;
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