/**
 * Writes CSS content to a specified directory.
 * Ensures that the directory exists before writing the file.
 *
 * @param {string} dir - The directory where the CSS file will be written.
 * @param {string | Promise<string>} source - The CSS content to write.
 */
export function writeDoc(dir: string, source: string | Promise<string>, docName: any): Promise<void>;