import { Primitive } from '../../../core/types.js';
import { HsonNode } from '../../../core/types.js';
export declare function escape_attr(v: string): string;
/** Serialize one canonical graph value into its HTML transport spelling. */
export declare function serialize_xml(node: HsonNode | Primitive | undefined): string;
/**
 * Public HTML serializer for Hson trees (2.0 surface).
 *
 * Pipeline:
 * 1. Clone & guard:
 *    - `clone_node($node)` to avoid mutating the original IR.
 *    - Require that the clone is a valid `HsonNode`, otherwise throw.
 *
 * 2. Invariant check:
 *    - `assert_invariants(clone, "serialize_html")` ensures that the
 *      internal Hson structure is well-formed before any emission.
 *
 * 3. XML stage:
 *    - Delegates to `serialize_xml(clone)` to produce an XML-like string
 *      that faithfully represents Hson semantics (including `_hson_val`, `_hson_obj`,
 *      `_hson_arr`, `_hson_ii`, etc.).
 *
 * 4. HTML normalization:
 *    - Converts boolean attributes from `key="key"` to `key` using a regex
 *      replacement; this matches standard HTML boolean attribute semantics.
 *
 * 5. Finalization:
 *    - Returns `htmlString.trim()` to remove leading/trailing whitespace.
 *
 * Characteristics:
 * - `_hson_str` is explicit when required to preserve a transport boundary.
 * - `_hson_val` uses a `<_hson_val>…</_hson_val>` literal representation.
 * - `_hson_elem` appears only when its transport boundary is required;
 *   `_hson_root` never appears as a tag.
 * - `_hson_obj` and other clusters remain visible where necessary to preserve
 *   Hson’s JSON-mode structure.
 *
 * @param node - Root Hson node or primitive to serialize as HTML.
 * @returns A trimmed HTML string ready for DOM insertion or inspection.
 * @throws If invariants fail or if the input is not a valid HsonNode.
 */
export declare function serialize_html(node: HsonNode | Primitive): string;
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