d-u-w-eleventy-example/eleventy.config.js

"use strict";

const htmlLint = require("./lib/html-lint.js");

module.exports = (eleventyConfig) => {

  eleventyConfig.addPlugin(htmlLint);
  
  return {
    dir: {
      input: "content/",
      includes: "../includes",
      data: "../data",
      layouts: "../layouts",
    },
  };
};