/**
 * Create an extension for `mdast-util-from-markdown` to enable GFM
 * strikethrough in markdown.
 *
 * @returns {FromMarkdownExtension}
 *   Extension for `mdast-util-from-markdown` to enable GFM strikethrough.
 */
export function gfmStrikethroughFromMarkdown(): FromMarkdownExtension;
/**
 * Create an extension for `mdast-util-to-markdown` to enable GFM
 * strikethrough in markdown.
 *
 * @returns {ToMarkdownExtension}
 *   Extension for `mdast-util-to-markdown` to enable GFM strikethrough.
 */
export function gfmStrikethroughToMarkdown(): ToMarkdownExtension;
import type { Extension as FromMarkdownExtension } from 'mdast-util-from-markdown';
import type { Options as ToMarkdownExtension } from 'mdast-util-to-markdown';
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