webawesome/packages/webawesome/docs/_transformers/format-code.js

import { format } from 'prettier';
import defaultOptions from '../../prettier.config.js';

/**
 * Formats a string of code using Prettier.
 *
 * @param {string} code - The code to format.
 * @param {*} options - Prettier options. Defaults are taken from the project's root config. See this page for more
 *   info: https://prettier.io/docs/en/options.html
 */
export async function formatCode(string, options) {
  return await format(string, {
    ...defaultOptions,
    ...options,
  });
}

/**
 * Eleventy plugin to format page HTML using Prettier.
 */
export function formatCodePlugin(options = {}) {
  options = {
    parser: 'html',
    ...options,
  };

  return function (eleventyConfig) {
    eleventyConfig.addTransform('format-code', content => {
      return formatCode(content, options);
    });
  };
}