eleventy.config.js

const { DateTime } = require("luxon");

const pluginBundle = require("@11ty/eleventy-plugin-bundle");
const pluginNavigation = require("@11ty/eleventy-navigation");
const pluginRss = require("@11ty/eleventy-plugin-rss");
const { EleventyHtmlBasePlugin } = require("@11ty/eleventy");

const pluginImages = require("./eleventy.config.images.js");

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

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

	// App plugins
	eleventyConfig.addPlugin(pluginImages);

	// Official 11ty plugins
	eleventyConfig.addPlugin(pluginBundle);
	eleventyConfig.addPlugin(pluginNavigation);
	eleventyConfig.addPlugin(pluginRss);
	eleventyConfig.addPlugin(EleventyHtmlBasePlugin);

	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);
	});

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

	eleventyConfig.addShortcode("currentBuildDate", () => {
		return new Date().toISOString();
	});

	return {
		dir: {
			input: "content",
			includes: "../_includes",
			data: "../_data",
			output: "_site",
		},
	};
};