/**
 * Escape a primitive value for safe inclusion in serialized HTML.
 *
 * Behavior:
 * - Accepts only Hson primitives (string | number | boolean | null).
 * - Throws if a non-primitive value is provided, since structured values
 *   should never reach HTML text serialization directly.
 * - Non-string primitives are stringified without escaping.
 * - Strings are HTML-escaped to neutralize markup-significant characters.
 *
 * Escapes:
 * - `&` → `&`
 * - `<` → `&lt;`
 * - `>` → `&gt;`
 * - `"` → `&quot;`
 * - `'` → `&#039;`
 *
 * Intended use:
 * - Final safety pass before emitting raw HTML text nodes or attribute values
 *   that are not already known to be safe.
 * - Not for escaping inside structured DOM APIs (which handle this themselves).
 *
 * @param str - A primitive value to escape for HTML output.
 * @returns The escaped string representation.
 * @throws If `str` is not a primitive value.
 */
export declare function escape_html_text(str: any): string;
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