gatsby-config.js

/**
 * Configure your Gatsby site with this file.
 *
 * See: https://www.gatsbyjs.org/docs/gatsby-config/
 */

// Loads .env.development in order to enable Playground mode of Graphql
require('dotenv').config({
  path: `.env.${process.env.NODE_ENV}`,
});

module.exports = {
  siteMetadata: {
    title: 'Gatsby Markdown Starter',
    description: `Gatsby Markdown Starter`,
    author: 'Adriano Rosa',
  },
  // assetPrefix: `https://cdn.example.com`,
  plugins: [
    `gatsby-plugin-react-helmet`,
    `gatsby-plugin-sass`,
    {
      resolve: `gatsby-source-filesystem`,
      options: {
        name: `posts`,
        path: `${__dirname}/_posts/`,
      },
    },

    {
      resolve: `gatsby-transformer-remark`,
      options: {
        tableOfContents: {
          heading: null,
          maxDepth: 3,
        },
        plugins: [
          {
            resolve: `gatsby-remark-prismjs`,
            options: {},
          },
        ],
      },
    },
  ],
};