gatsby-config.js

module.exports = {
  siteMetadata: {
    title: "Gatsby + Netlify CMS Starter"
  },
  plugins: [
    "gatsby-plugin-react-helmet",
    "gatsby-plugin-sass",
    {
      resolve: "gatsby-source-filesystem",
      options: {
        path: `${__dirname}/src/pages`,
        name: "pages"
      }
    },
    {
      resolve: "gatsby-source-filesystem",
      options: {
        path: `${__dirname}/src/img`,
        name: "images"
      }
    },
    "gatsby-plugin-sharp",
    "gatsby-transformer-sharp",
    {
      resolve: "gatsby-transformer-remark",
      options: {
        plugins: []
      }
    },
    {
      resolve: "gatsby-plugin-netlify-cms",
      options: {
        modulePath: `${__dirname}/src/cms/cms.js`
      }
    },
    {
      resolve: `gatsby-plugin-segment-js`,
      options: {
        // your segment write key for your production environment
        // when process.env.NODE_ENV === 'production'
        // required; non-empty string
        prodKey: process.env.SEGMENT_PRODUCTION_WRITE_KEY,

        // if you have a development env for your segment account, paste that key here
        // when process.env.NODE_ENV === 'development'
        // optional; non-empty string
        devKey: process.env.SEGMENT_DEVELOPMENT_WRITE_KEY,

        // whether you want to include analytics.page()
        // optional; boolean that defaults to true
        // if false, then don't forget to manually add it to your codebase manually!
        trackPage: true
      }
    },
    "gatsby-plugin-netlify" // make sure to keep it last in the array
  ]
};