Gatsby changes to hide drafts

gatsby-node.js

const path = require(`path`)
const { createFilePath } = require(`gatsby-source-filesystem`)

const isProduction = process.env.NODE_ENV === `production`;

exports.createPages = async ({ graphql, actions, reporter }) => {
  const { createPage } = actions

  // Define a template for blog post
  const blogPost = path.resolve(`./src/templates/blog-post.js`)

  // Get all markdown blog posts sorted by date
  const result = await graphql(
    `
      {
        allMarkdownRemark(
          sort: { fields: [frontmatter___date], order: ASC }
          limit: 1000
        ) {
          nodes {
            id
            fields {
              slug,
              isDraft
            }
          }
        }
      }
    `
  )

  if (result.errors) {
    reporter.panicOnBuild(
      `There was an error loading your blog posts`,
      result.errors
    )
    return
  }

  const posts = result.data.allMarkdownRemark.nodes

  // Create blog posts pages
  // But only if there's at least one markdown file found at "content/blog" (defined in gatsby-config.js)
  // `context` is available in the template as a prop and as a variable in GraphQL

  if (posts.length > 0) {
    posts.forEach((post, index) => {
      // Do not expose drafts as pages
      if(post.fields.isDraft && isProduction) {
        return;
      }

      const previousPostId = index === 0 ? null : posts[index - 1].id
      const nextPostId = index === posts.length - 1 ? null : posts[index + 1].id

      createPage({
        path: post.fields.slug,
        component: blogPost,
        context: {
          id: post.id,
          previousPostId,
          nextPostId,
        },
      })
    })
  }
}

exports.onCreateNode = ({ node, actions, getNode }) => {
  const { createNodeField } = actions

  if (node.internal.type === `MarkdownRemark`) {
    const slug = createFilePath({ node, getNode })    
    createNodeField({
      name: `slug`,
      node,
      value: slug,
    });

    if(isProduction) {
      const isDraft = slug.indexOf('/draft') === 0;

      createNodeField({
        name: `isDraft`,
        node,
        value: isDraft,
      })
    }
  }
}

exports.createSchemaCustomization = ({ actions }) => {
  const { createTypes } = actions

  // Explicitly define the siteMetadata {} object
  // This way those will always be defined even if removed from gatsby-config.js

  // Also explicitly define the Markdown frontmatter
  // This way the "MarkdownRemark" queries will return `null` even when no
  // blog posts are stored inside "content/blog" instead of returning an error
  createTypes(`
    type SiteSiteMetadata {
      author: Author
      siteUrl: String
      social: Social
    }

    type Author {
      name: String
      summary: String
    }

    type Social {
      twitter: String
    }

    type MarkdownRemark implements Node {
      frontmatter: Frontmatter
      fields: Fields
    }

    type Frontmatter {
      title: String
      description: String
      date: Date @dateformat
    }

    type Fields {
      slug: String,
      isDraft: Boolean
    }
  `)
}

index.js

// src/pages/index.js

import React from "react"
import { Link, graphql } from "gatsby"

import Bio from "../components/bio"
import Layout from "../components/layout"
import SEO from "../components/seo"

const BlogIndex = ({ data, location }) => {
  const siteTitle = data.site.siteMetadata?.title || `Title`
  const posts = data.allMarkdownRemark.nodes.filter(n => {
    if(n.fields['isDraft']) {
      return false;
    }

    return true;
  });

  if (posts.length === 0) {
    return (
      <Layout location={location} title={siteTitle}>
        <SEO title="All posts" />
        <Bio />
        <p>
          No blog posts found. Add markdown posts to "content/blog" (or the
          directory you specified for the "gatsby-source-filesystem" plugin in
          gatsby-config.js).
        </p>
      </Layout>
    )
  }

  return (
    <Layout location={location} title={siteTitle}>
      <SEO title="All posts" />
      <Bio />
      <ol style={{ listStyle: `none` }}>
        {posts.map(post => {
          const title = post.frontmatter.title || post.fields.slug

          return (
            <li key={post.fields.slug}>
              <article
                className="post-list-item"
                itemScope
                itemType="http://schema.org/Article"
              >
                <header>
                  <h2>
                    <Link to={post.fields.slug} itemProp="url">
                      <span itemProp="headline">{title}</span>
                    </Link>
                  </h2>
                  <small>{post.frontmatter.date}</small>
                </header>
                <section>
                  <p
                    dangerouslySetInnerHTML={{
                      __html: post.frontmatter.description || post.excerpt,
                    }}
                    itemProp="description"
                  />
                </section>
              </article>
            </li>
          )
        })}
      </ol>
    </Layout>
  )
}

export default BlogIndex

export const pageQuery = graphql`
  query {
    site {
      siteMetadata {
        title
      }
    }
    allMarkdownRemark(sort: { fields: [frontmatter___date], order: DESC }) {
      nodes {
        excerpt
        fields {
          slug,
          isDraft
        }
        frontmatter {
          date(formatString: "MMMM DD, YYYY")
          title
          description
        }
      }
    }
  }
`