import type { NamespaceURI } from '@markuplint/ml-ast';
/**
 * Determines the namespace URI for an element given its tag name and the parent's namespace.
 *
 * Uses parse5 to simulate parsing and determine whether a tag belongs to
 * the HTML, SVG, or MathML namespace within the given parent context.
 *
 * @param tagName - The element tag name to resolve
 * @param parentNamespace - The namespace URI of the parent element (defaults to XHTML)
 * @returns The resolved namespace URI for the tag
 */
export declare function getNamespace(tagName: string, parentNamespace?: string): NamespaceURI;