Personal-Site/eleventy.config.drafts.js

function eleventyComputedPermalink() {
	// When using `addGlobalData` and you *want* to return a function, you must nest functions like this.
	// `addGlobalData` acts like a global data file and runs the top level function it receives.
	return (data) => {
		if(data.draft && process.env.BUILD_DRAFTS != "true") {
			return false;
		}

		return data.permalink;
	}
};

function eleventyComputedExcludeFromCollections() {
	// When using `addGlobalData` and you *want* to return a function, you must nest functions like this.
	// `addGlobalData` acts like a global data file and runs the top level function it receives.
	return (data) => {
		if(data.draft && process.env.BUILD_DRAFTS != "true") {
			return true;
		}

		return data.eleventyExcludeFromCollections;
	}
};

module.exports.eleventyComputedPermalink = eleventyComputedPermalink;
module.exports.eleventyComputedExcludeFromCollections = eleventyComputedExcludeFromCollections;

module.exports = eleventyConfig => {
	eleventyConfig.addGlobalData("eleventyComputed.permalink", eleventyComputedPermalink);
	eleventyConfig.addGlobalData("eleventyComputed.eleventyExcludeFromCollections", eleventyComputedExcludeFromCollections);

	let logged = false;
	eleventyConfig.on("eleventy.before", ({runMode}) => {
		let text = "Excluding";

		if(process.env.BUILD_DRAFTS == "true") {
			text = "Including";
		}

		// Only log once.
		if(!logged) {
			console.log( `[11ty/drafts] ${text} drafts.` );
		}

		logged = true;
	});
}