import { Plugin } from 'unified';
import { DastRoot } from '../packages/parser/dist';
/**
 * Upgrade the type-less `<copy>` tag to have the same type as its referent.
 * ```xml
 *    <math name="m">5</math><copy source="m" name="k" />
 * ```
 * becomes
 * ```xml
 *   <math name="m">5</math><math extend="$m" name="k" />
 * ```
 */
export declare const upgradeCopySyntax: Plugin<[], DastRoot, DastRoot>;
//# sourceMappingURL=upgrade-copy-syntax.d.ts.map