gatsby-config.js

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

require("dotenv").config({
  path: `.env.${process.env.NODE_ENV}`,
})

module.exports = {
  plugins: [
    `gatsby-plugin-sass`,
    `gatsby-plugin-react-helmet`,
    {
      resolve: `gatsby-plugin-google-gtag`,
      options: {
        // You can add multiple tracking ids and a pageview event will be fired for all of them.
        trackingIds: [
          process.env.GA_ID, // Google Analytics / GA
        ],
        // This object is used for configuration specific to this plugin
        pluginConfig: {
          // Puts tracking script in the head instead of the body
          head: true,
          // Setting this parameter is also optional
          respectDNT: true,
          // Avoids sending pageview hits from custom paths
          exclude: ["/preview/**", "/do-not-track/me/too/"],
        },
      },
    },
  ],
}