import type { XmlNode } from './tree';
export interface SerializeOptions {
    /** Emit `<?xml … ?>` declaration. Defaults to true. */
    xmlDeclaration?: boolean;
    /** `standalone` attribute on the declaration. Defaults to 'yes'. */
    standalone?: 'yes' | 'no' | 'omit';
}
/**
 * Serialize an {@link XmlNode} tree into a UTF-8 byte payload. The
 * inverse of {@link parseXml}: `parseXml(serializeXml(n))` yields a
 * tree structurally equivalent to `n` modulo attribute insertion order
 * (which both directions preserve on Node 18+ / V8).
 */
export declare function serializeXml(root: XmlNode, opts?: SerializeOptions): Uint8Array;