.eleventy.js

const path = require("path");
const prettier = require("prettier");

module.exports = (config) => {
    // This enable all the dependency libraries inside the `assets` folder
    config.addPassthroughCopy({
        "node_modules/reveal.js/dist": "assets/reveal/",
        "node_modules/reveal.js/plugin": "assets/reveal/plugin",
    });

    // This copies anything from `src/images` into `dist/images`.
    // Call it using <img src="images/my-image.jpg" />
    config.addPassthroughCopy("./src/images/");

    // Prettifies the output html so the indentations are correct
    config.addTransform("prettier", function (content, outputPath) {
        const extname = path.extname(outputPath);
        switch (extname) {
            case ".html":
                // Strip leading period from extension and use as the Prettier parser.
                const parser = extname.replace(/^./, "");
                return prettier.format(content, { parser });

            default:
                return content;
        }
    });

    return {
        markdownTemplateEngine: "njk",
        dataTemplateEngine: "njk",
        htmlTemplateEngine: "njk",

        dir: {
            input: "src",
            output: "dist",
        },
    };
};