gatsby-config.js

module.exports = options => {
  const { mdx = true } = options
  return {
    siteMetadata: {
      title: `Blog Title Placeholder`,
      author: `Name Placeholder`,
      description: `Description placeholder`,
      url: ``,
      social: [
        {
          key: `twitter`,
          username: `Twitter`,
          url: `https://twitter.com/gatsbyjs`,
        },
        {
          key: `github`,
          username: `GitHub`,
          url: `https://github.com/gatsbyjs`,
        },
      ],
    },
    plugins: [
      mdx && {
        resolve: `gatsby-plugin-mdx`,
        options: {
          extensions: [`.mdx`, `.md`],
          gatsbyRemarkPlugins: [
            {
              resolve: `gatsby-remark-images`,
              options: {
                // should this be configurable by the end-user?
                maxWidth: 1380,
                linkImagesToOriginal: false,
              },
            },
            { resolve: `gatsby-remark-copy-linked-files` },
            { resolve: `gatsby-remark-numbered-footnotes` },
            { resolve: `gatsby-remark-smartypants` },
          ],
          remarkPlugins: [require(`remark-slug`)],
        },
      },
      `gatsby-plugin-sharp`, `gatsby-transformer-sharp`,
      {
        resolve: `gatsby-source-filesystem`,
        options: {
          path: options.contentPath || `content/posts`,
          name: options.contentPath || `content/posts`,
        },
      },
      {
        resolve: `gatsby-source-filesystem`,
        options: {
          path: options.assetPath || `content/assets`,
          name: options.assetPath || `content/assets`,
        },
      },
      {
        resolve: "gatsby-transformer-remark",
        options: {
          typeName: "Post",
        },
      },
      {
        resolve: `gatsby-plugin-emotion`,
        options: {
          // Accepts all options defined by `babel-plugin-emotion` plugin.
        },
      },
      'gatsby-plugin-react-helmet',
    ].filter(Boolean),
  }
}