/**
 * @import {Options, State} from 'mdast-util-to-markdown'
 */
/**
 * Checks the preferred fence option.
 *
 * @param {State} state
 *   Info passed around.
 * @returns {Exclude<Options['fence'], null | undefined>}
 *   Preferred fence marker.
 */
export function checkFence(state: State): Exclude<Options["fence"], null | undefined>;
import type { State } from 'mdast-util-to-markdown';
import type { Options } from 'mdast-util-to-markdown';
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