.eleventy.js

const fs = require("fs");
const htmlmin = require("html-minifier");
const markdownIt = require("markdown-it");
const pluginRss = require("@11ty/eleventy-plugin-rss");

module.exports = function (eleventyConfig) {
  eleventyConfig.addPlugin(pluginRss);

  if (process.env.ELEVENTY_PRODUCTION) {
    eleventyConfig.addTransform("htmlmin", htmlminTransform);
  } else {
    eleventyConfig.setBrowserSyncConfig({
      callbacks: { ready: browserSyncReady },
    });
  }

  // Passthrough
  eleventyConfig.addPassthroughCopy({ "src/static": "." });

  // Watch targets
  eleventyConfig.addWatchTarget("./src/styles/");

  var pathPrefix = "";
  if (process.env.GITHUB_REPOSITORY) {
    pathPrefix = process.env.GITHUB_REPOSITORY.split("/")[1];
  }

  const options = {
    html: true,
    breaks: true,
    linkfy: false,
  };

  eleventyConfig.setLibrary("md", markdownIt(options));

  return {
    dir: {
      input: "src",
    },
    pathPrefix,
  };
};

function browserSyncReady(err, bs) {
  bs.addMiddleware("*", (req, res) => {
    const content_404 = fs.readFileSync("_site/404.html");
    // Provides the 404 content without redirect.
    res.write(content_404);
    // Add 404 http status code in request header.
    // res.writeHead(404, { "Content-Type": "text/html" });
    res.writeHead(404);
    res.end();
  });
}

function htmlminTransform(content, outputPath) {
  if (outputPath.endsWith(".html")) {
    let minified = htmlmin.minify(content, {
      useShortDoctype: true,
      removeComments: true,
      collapseWhitespace: true,
    });
    return minified;
  }
  return content;
}