Prevent draft and scheduled posts from being written to output in Eleventy

posts.11tydata.js

module.exports = {
  layout: 'layouts/post.html',
  eleventyComputed: {
    permalink(data) {
      if (!data.draft && new Date(data.date) <= new Date()) {
        return data.permalink || '/blog/{{ title | slug }}/index.html';
      }
      return false;
    }
  }
};

Line 6 assumes you're using Nunjucks and/or Liquid as your template language(s).

This directory data should be used in conjunction with the following collection in your Eleventy config file:

https://gist.github.com/kieranbarker/01e960ffa36ebeffc14e244414eb8270