/**
 * XmlSerializer  (v1.4 update)
 * ──────────────────────────────
 * Phase 4 of the XML pipeline: converts a DOM tree back to an XML string.
 *
 * v1.4 additions
 * ───────────────
 *  • G23 — xml:space="preserve" propagation from ancestors (not just element)
 *  • G20 — Namespace prefix control: `preferredPrefixes` map, `sortAttributes`
 *  • Consistent attribute ordering (optional sort)
 *
 * Responsibilities
 * ────────────────
 *  • Configurable indentation
 *  • Mixed-content detection — never re-indents mixed nodes
 *  • xml:space="preserve" honoured at every level, including inherited
 *  • CDATA preserved intact
 *  • Self-closing tags for empty elements (configurable)
 *  • XML declaration emitted optionally
 *  • Namespace declarations preserved
 *  • Attribute value encoding (both quotes, tab/cr/lf)
 *
 * Usage
 * ─────
 *  const xml = new XmlSerializer().serialize(doc);
 *  const xml = new XmlSerializer({ indent: 4, selfClose: false }).serialize(doc);
 */
import { XmlDocument, XmlElement } from './XmlNodes';
export interface SerializerOptions {
    /**
     * Number of spaces per indent level (default: 2).
     * Set to 0 to disable indentation (compact output).
     */
    indent?: number;
    /**
     * Emit the XML declaration at the top (default: true).
     */
    xmlDeclaration?: boolean;
    /**
     * Serialise empty elements as `<tag/>` (default: true).
     * Set to false to emit `<tag></tag>` instead.
     */
    selfClose?: boolean;
    /**
     * Line separator string (default: '\n').
     */
    newline?: string;
    /**
     * G20: Map of namespace URI → preferred prefix.
     * When set, the serializer emits the preferred prefix instead of the
     * original source prefix (useful for normalising output).
     * Example: { 'http://www.w3.org/2001/XMLSchema': 'xs' }
     */
    preferredPrefixes?: Record<string, string>;
    /**
     * G20: Sort attributes alphabetically (default: false).
     * Useful for canonical output and diff-friendly serialisation.
     */
    sortAttributes?: boolean;
}
export declare class XmlSerializer {
    private indent;
    private xmlDecl;
    private selfClose;
    private nl;
    private preferredPrefixes;
    private sortAttrs;
    constructor(options?: SerializerOptions);
    /** Serialize a full document including the XML declaration. */
    serialize(doc: XmlDocument): string;
    /** Serialize a single element (no XML declaration). */
    serializeElement(elem: XmlElement, indentLevel?: number): string;
    private _xmlDecl;
    private _serializeNode;
    private _serializeElement;
    /** G20: Build attribute string with optional sort and preferred prefix rewriting */
    private _buildAttrString;
}
/**
 * Convenience function — serialize a document with default options.
 */
export declare function serializeXml(doc: XmlDocument, options?: SerializerOptions): string;
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