/*******
 * Expand selected named HTML entities into their numeric equivalents.
 *
 * This performs a conservative, explicit rewrite of a small allowlist of
 * named entities (e.g. `©`) into numeric character references
 * (e.g. `©`).
 *
 * Behavior:
 * - Leaves the core XML/HTML entities untouched:
 *   `&`, `<`, `>`, `"`, `'`
 * - Rewrites only entities explicitly listed in `htmlNamedToNumeric`.
 * - Leaves unknown entities unchanged so that later parsing or validation
 *   stages can decide how to handle them.
 *
 * Rationale:
 * - Numeric entities are unambiguous and safer to carry across parsing
 *   boundaries (HTML ↔ XML ↔ Hson).
 * - Keeping the mapping explicit avoids silently expanding entities that
 *   may not be universally supported or desired.
 *
 * Scope:
 * - This is *not* a general HTML entity decoder.
 * - It does not handle numeric-to-character decoding.
 * - It does not validate whether an entity is semantically valid in context.
 *
 * @param input - Source text potentially containing named HTML entities.
 * @returns Text with known named entities expanded to numeric references.
 *******/
export declare function expand_entities(input: string): string;
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