gatsby-config.js

let activeEnv =
  process.env.GATSBY_ACTIVE_ENV || process.env.NODE_ENV || "development"

console.log(`Using environment config: '${activeEnv}'`)

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

module.exports = {
  siteMetadata: {
    title: `Docker FlashCards`,
    description: `The collection of flash cards for your docker learning`,
    author: `@zhangxd6`,
  },
  __experimentalThemes: [
    {
      resolve: "gatsby-theme-apollo",
      options: {
        root: __dirname,
      },
    },
  ],
  plugins: [{
    resolve: `gatsby-plugin-google-analytics`,
    options: {
      // replace "UA-XXXXXXXXX-X" with your own Tracking ID
      trackingId: "UA-140440601-1",
    },
   },
    `gatsby-plugin-react-helmet`,
    {
      resolve: `gatsby-source-filesystem`,
      options: {
        name: `content`,
        path: `${__dirname}/src/content`,
      },
    },

    {
      resolve: "gatsby-transformer-remark",
      options: {
        excerpt_separator: "<!-- end -->",
        plugins: [
          "gatsby-remark-autolink-headers",
          {
            resolve: "gatsby-remark-images",
            options: {
              linkImagesToOriginal: false,
            },
          },
        ],
      },
    },
    `gatsby-plugin-sharp`,
    `gatsby-transformer-sharp`,
    // this (optional) plugin enables Progressive Web App + Offline functionality
    // To learn more, visit: https://gatsby.dev/offline
    // `gatsby-plugin-offline`,
  ],
}