/**
 * Creates the CSS matching the markup of `highlightBookSourceToHtml`.
 *
 * Both the stylesheet and the markup are derived from the shared
 * `BOOK_EDITOR_SYNTAX_TOKEN_STYLES`, therefore a statically rendered book keeps
 * the exact colors of `<BookEditor/>`.
 *
 * @returns CSS rules for every Book syntax token.
 *
 * @private internal utility of `BookEditor`
 */
export declare function createBookSourceHighlightStyles(): string;