eleventy.config.js

const navigation = require('@11ty/eleventy-navigation');
const dates = require('./utilities/filters/dates');
const helpers = require('./utilities/filters/helpers');
const path = require('path');

module.exports = (config) => {
  // navigation plugin
  config.addPlugin(navigation);

  // Human readable date for posts
  config.addFilter('dateDisplay', dates.friendly);

  // Timestamp for datetime element
  config.addFilter('timestamp', dates.timestamp);

  // Remove whitespace from a string
  config.addNunjucksFilter('spaceless', helpers.spaceless);

  // Minify our HTML
  config.addTransform(
    'htmlminify',
    require('./utilities/transforms/htmlminify')
  );

  // Collections
  config.addCollection('blog', (collection) => {
    const blogs = collection.getFilteredByTag('blog');

    for (let i = 0; i < blogs.length; i++) {
      const previous_post = blogs[i - 1];
      const next_post = blogs[i + 1];

      blogs[i].data['previous_post'] = previous_post;
      blogs[i].data['next_post'] = next_post;
    }

    return blogs.reverse();
  });

  // Categories collection
  config.addCollection('categories', (collection) => {
    const list = new Set();

    collection.getAll().forEach((item) => {
      if (!item.data.tags) return;

      item.data.tags
        .filter((category) => !['blog', 'all'].includes(category))
        .forEach((category) => list.add(category));
    });

    return Array.from(list).sort();
  });

  // Layout aliases
  config.addLayoutAlias('base', 'layouts/base.njk');
  config.addLayoutAlias('home', 'layouts/home.njk');
  config.addLayoutAlias('page', 'layouts/page.njk');
  config.addLayoutAlias('blog', 'layouts/blog.njk');
  config.addLayoutAlias('post', 'layouts/post.njk');
  config.addLayoutAlias('contact', 'layouts/contact.njk');
  config.addLayoutAlias('category', 'layouts/category.njk');
  config.addLayoutAlias('default', 'layouts/default.njk');

  // Include our static assets
  config.addPassthroughCopy('css');
  config.addPassthroughCopy('js');
  config.addPassthroughCopy('images');
  config.addPassthroughCopy('favicon.png');
  config.addPassthroughCopy('favicon.svg');
  config.addPassthroughCopy('favicon.ico');

  return {
    markdownTemplateEngine: 'njk',
    dir: {
      input: 'site',
      output: 'public',
      includes: 'includes',
      data: 'globals',
    },
  };
};