bundle_analyzer_next.config.js

const { BundleAnalyzerPlugin } = require('webpack-bundle-analyzer')

module.exports = {
  webpack: (config, { buildId, dev, isServer, defaultLoaders, webpack }) => {
    if (ANALYZE) {
     config.plugins.push(
       new BundleAnalyzerPlugin({
         analyzerMode: 'server',
         analyzerPort: isServer ? 8888 : 8889,
         openAnalyzer: true,
       })
     )
    }
    return config
  },
}