eleventy.config.js

import { minify } from "html-minifier-terser";

/**
 * @see https://www.11ty.dev/docs/config/
 * @param {import("@11ty/eleventy").UserConfig} eleventyConfig
 */
export default function (eleventyConfig) {
	// Copy the contents of the `public` folder to the output folder
	eleventyConfig.addPassthroughCopy({ "./public/": "/" });

	// Add a transform to minify HTML and CSS output
	// https://www.11ty.dev/docs/transforms/#minify-html-output
	eleventyConfig.addTransform("htmlmin", function (content) {
		if ((this.page.outputPath || "").endsWith(".html")) {
			return minify(content, {
				collapseBooleanAttributes: true,
				collapseWhitespace: true,
				minifyCSS: true,
				removeAttributeQuotes: true,
				removeOptionalTags: true,
				removeRedundantAttributes: true,
				sortAttributes: true,
				sortClassName: true,
			});
		}

		// If not an HTML output, return content as-is
		return content;
	});

	return {
		dir: {
			input: "content",
			includes: "../_includes",
		},
	};
}