import { MathNode } from '../core/document-model/index.js';
/**
 * Serialize a {@link MathNode} tree to the inner content of an `<m:oMath>`
 * element (ECMA-376 Part 1 §22). The inverse of `parseOMath`; the `m:` namespace
 * is declared by the caller, and the output round-trips back through the parser
 * (WT3).
 *
 * @param node The math tree (typically a `row` node).
 * @returns The serialized OMML markup.
 */
export declare function omathXml(node: MathNode): string;