Gatsby

yarn add gatsby-plugin-posthog

npm install --save gatsby-plugin-posthog

// In your gatsby-config.js
module.exports = {
  plugins: [
    {
      resolve: `gatsby-plugin-posthog`,
      options: {
        // Specify the API key for your PostHog Project (required)
        apiKey: "<ph_project_api_key>",
        // Specify the app host if self-hosting (optional, default: https://app.posthog.com)
        apiHost: "<ph_instance_address>",
        // Puts tracking script in the head instead of the body (optional, default: true)
        head: true,
        // Enable posthog analytics tracking during development (optional, default: false)
        isEnabledDevMode: true
      },
    },
  ],
}