/**
 * Creates a safe markdown fenced code block even when content contains backticks.
 *
 * @param content - Raw code content.
 * @param language - Optional info-string language label.
 * @returns Fenced code block.
 *
 * @private internal utility of `createStandaloneBookLanguageMarkdown`
 */
export declare function getSafeCodeBlock(content: string, language?: string): string;