gatsby-config.js

const path = require(`path`)
var productionPlugins = []
if(process.env.GATSBY_STAGE&&process.env.GATSBY_STAGE==='production'){
  productionPlugins.push(
    {
      resolve: `gatsby-plugin-google-analytics`,
      options: {
        trackingId: "UA-129727991-1",
        // Puts tracking script in the head instead of the body
        head: true,
        // Setting this parameter is optional
        anonymize: true,
        // Setting this parameter is also optional
        respectDNT: true,
        // Avoids sending pageview hits from custom paths
        // exclude: [],
        // Enables Google Optimize using your container Id
        // optimizeId: "YOUR_GOOGLE_OPTIMIZE_TRACKING_ID",
        // Any additional create only fields (optional)
        // sampleRate: 5,
        // siteSpeedSampleRate: 10,
        // cookieDomain: "example.com",
      },
    },
  )
  productionPlugins.push(
    {
      resolve: `gatsby-plugin-facebook-pixel`,
      options: {
        pixelId: '432447416966399',
      },
    }
  ) 
}
module.exports = {
  siteMetadata: {
    title: "GraphQL Asia",
    author: "Tobias Meixner",
    description: "GraphQL Asia - Asia's first GraphQL conference"
  },
  plugins: [
    ...productionPlugins,
    {
      resolve: `gatsby-plugin-prefetch-google-fonts`,
      options: {
        fonts: [
          {
            family: `Roboto`,
            
          },
          {
            family: `Nunito`,
            variants: [`400`,`800`,`800i`,`900`,`900i`]
          }
        ],
      },
    },
    'gatsby-plugin-react-helmet',
    {
      resolve: `gatsby-plugin-fullstory`,
      options: {
        fs_org: 'JY8BM',
      },
    },
    {
      resolve: `gatsby-source-filesystem`,
      options: {
        name: `images`,
        path: path.join(__dirname, `src`,`assets`, `images`),
      },
    },
    `gatsby-transformer-sharp`, 
    `gatsby-plugin-sharp`,
    {
      resolve: `gatsby-plugin-manifest`,
      options: {
        name: 'GraphQL Asia',
        short_name: 'GraphQL Asia',
        start_url: '/',
        background_color: '#E535AB',
        theme_color: '#E535AB',
        display: 'minimal-ui',
        icon: 'src/assets/images/icon.png', // This path is relative to the root of the site.
      },
    },
    'gatsby-plugin-sass',
    // 'gatsby-plugin-offline'
  ],
}