eleventy.config.js

import draftPlugins from "./plugins/drafts.eleventy.js";
import navigationPlugin from "@11ty/eleventy-navigation";
import syntaxHighlightPlugin from "@11ty/eleventy-plugin-syntaxhighlight";
import { eleventyImageTransformPlugin } from "@11ty/eleventy-img";
import { DateTime } from "luxon";
// @ts-ignore
import { EleventyHtmlBasePlugin } from "@11ty/eleventy";

/** @param {import('@11ty/eleventy').UserConfig} eleventyConfig */
export default function (eleventyConfig) {
  // Copy the contents of the `public` folder to the output folder
  // For example, `./public/css/` ends up in `_site/css/`
  eleventyConfig.addPassthroughCopy({
    "./public/": "/",
  });

  // @ts-ignore
  eleventyConfig.addBundle("css", {
    transforms: [
      /** @param {string} content  */
      function (content) {
        return content.replace(/\.\.\//g, "/");
      },
    ],
  });

  // Run Eleventy when these files change:
  // https://www.11ty.dev/docs/watch-serve/#add-your-own-watch-targets

  // Watch content images for the image pipeline.
  eleventyConfig.addWatchTarget("content/**/*.{svg,webp,png,jpeg}");
  eleventyConfig.addWatchTarget("public/**/*");

  eleventyConfig.addFilter("stringify", (value) =>
    JSON.stringify(value, null, 2),
  );

  eleventyConfig.addPlugin(navigationPlugin);
  eleventyConfig.addPlugin(syntaxHighlightPlugin);
  eleventyConfig.addPlugin(EleventyHtmlBasePlugin);
  eleventyConfig.addPlugin(eleventyImageTransformPlugin);

  eleventyConfig.addPlugin(draftPlugins, {
    draftDirName: "_drafts",
    draftFilePrefix: "_",
  });

  // Filters
  eleventyConfig.addFilter("readableDate", (dateObj, format, zone) => {
    // Formatting tokens for Luxon: https://moment.github.io/luxon/#/formatting?id=table-of-tokens
    return DateTime.fromJSDate(dateObj, { zone: zone || "utc" }).toFormat(
      format || "dd LLLL yyyy",
    );
  });

  eleventyConfig.addFilter("htmlDateString", (dateObj) => {
    // dateObj input: https://html.spec.whatwg.org/multipage/common-microsyntaxes.html#valid-date-string
    return DateTime.fromJSDate(dateObj, { zone: "utc" }).toFormat("yyyy-LL-dd");
  });

  // Get the first `n` elements of a collection.
  eleventyConfig.addFilter("head", (array, n) => {
    if (!Array.isArray(array) || array.length === 0) {
      return [];
    }
    if (n < 0) {
      return array.slice(n);
    }

    return array.slice(0, n);
  });

  // Return the smallest number argument
  eleventyConfig.addFilter("min", (...numbers) => {
    return Math.min.apply(null, numbers);
  });

  // Return all the tags used in a collection
  eleventyConfig.addFilter("getAllTags", (/** @type {any[]}*/ collection) => {
    let tagSet = new Set();
    for (let item of collection) {
      (item.data.tags || []).forEach((tag) => tagSet.add(tag));
    }
    return Array.from(tagSet);
  });

  eleventyConfig.addFilter(
    "filterTagList",
    function filterTagList(/** @type {string[]}*/ tags) {
      return (tags || []).filter(
        (tag) => ["all", "nav", "post", "posts"].indexOf(tag) === -1,
      );
    },
  );

  return {
    // Pre-process *.md files with: (default: `liquid`)
    markdownTemplateEngine: "njk",

    // Pre-process *.html files with: (default: `liquid`)
    htmlTemplateEngine: "njk",

    dir: {
      input: "contents",
      output: "dist",
      /** relative to `input` */
      includes: "../_includes",
      data: "../_data",
    },

    // -----------------------------------------------------------------
    // Optional items:
    // -----------------------------------------------------------------

    // If your site deploys to a subdirectory, change `pathPrefix`.
    // Read more: https://www.11ty.dev/docs/config/#deploy-to-a-subdirectory-with-a-path-prefix

    // When paired with the HTML <base> plugin https://www.11ty.dev/docs/plugins/html-base/
    // it will transform any absolute URLs in your HTML to include this
    // folder name and does **not** affect where things go in the output folder.
    pathPrefix: "/",
  };
}