/**
 * Fenced code blocks
 * - Same as Markdown syntax.
 * - Start when we reach an opening fence on a new line.
 * - Stop when we reach a matching closing fence on a new line, or the end of the string.
 * - Closing fence must be exactly the same as the opening fence, and can be made of three or more "```" backticks, or three or more `~~~` tildes.
 * - If there's no closing fence the code block will run to the end of the current string.
 * - Markdown-style four-space indent syntax is not supported (only fenced code since it's less confusing and more common).
 */
export declare const FENCED_RULE: import("../MarkupRule.js").MarkupRule;