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This is an older version of Eleventy. Go to the newest Eleventy docs (current path: /docs/quicktips/draft-posts/) or the full release history.
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Quick Tip #011—Draft Posts using Computed Data

Here’s a quick snippet that shows how to combine Eleventy’s Configuration API Global Data and Computed Data features in your Eleventy Configuration file to implement a simple drafts feature for any piece of content.

Set draft: true anywhere in a file’s data cascade and that file will be only be built when using Eleventy in --serve or --watch modes. It will be excluded from full Eleventy builds.

You might imagine how this could be extended to add a publishing date feature too: to exclude content from builds before a specific date set in a post’s front matter (or elsewhere in the data cascade).

Filename .eleventy.js
module.exports = function(eleventyConfig) {
  // When `permalink` is false, the file is not written to disk
	eleventyConfig.addGlobalData("eleventyComputed.permalink", function() {
		return (data) => {
			// Always skip during non-watch/serve builds
			if(data.draft && !process.env.BUILD_DRAFTS) {
				return false;
			}

			return data.permalink;
		}
	});

  // When `eleventyExcludeFromCollections` is true, the file is not included in any collections
	eleventyConfig.addGlobalData("eleventyComputed.eleventyExcludeFromCollections", function() {
		return (data) => {
			// Always exclude from non-watch/serve builds
			if(data.draft && !process.env.BUILD_DRAFTS) {
				return true;
			}

			return data.eleventyExcludeFromCollections;
		}
	});

	eleventyConfig.on("eleventy.before", ({runMode}) => {
		// Set the environment variable
		if(runMode === "serve" || runMode === "watch") {
			process.env.BUILD_DRAFTS = true;
		}
	});
}