next.config.js

const plugins = require('next-compose-plugins')
const withBundleAnalyzer = require('@next/bundle-analyzer')({
  enabled: process.env.ANALYZE === 'true',
})

// custom transpile module
const debug = false
let start = null
let i = 0

const match = (path) => {
  if (!path.includes('three/examples/jsm')) return false
  if (debug) {
    // should be around 3/4 seconds the first time and then 200ms after using Webpack 5 built-in loader cache
    let end = start ? new Date() - start : 0
    console.log(
      `\x1b[37m`,
      `🚄 ${end}ms - The transpilation ${path} in process`
    )
    if (i === 1) {
      start = new Date()
    }
    i++
  }
  return true
}

const withOffline = require('next-offline')
const withTM = require('next-transpile-modules')(
  ['three', '@react-three/drei'], // '@react-three/postprocessing'
  { debug: debug, unstable_webpack5: false, match } // symlink-caused loops which cause memory to get bloated exponentially.
)

const nextConfig = {
  webpack(config) {
    config.module.rules.push(
      { test: /react-spring/, sideEffects: true }, // prevent vercel to crash when deploy
      {
        test: /\.(glsl|vs|fs|vert|frag)$/,
        exclude: /node_modules/,
        use: ['raw-loader', 'glslify-loader'],
      }
    )
    return config
  },
}

// manage i18n
if (process.env.EXPORT !== 'true') {
  nextConfig.i18n = {
    locales: ['en-US'],
    defaultLocale: 'en-US',
  }
}

module.exports = plugins(
  [
    withTM(nextConfig),
    [
      withOffline,
      {
        workboxOpts: {
          swDest: process.env.NEXT_EXPORT
            ? 'service-worker.js'
            : 'static/service-worker.js',
          runtimeCaching: [
            {
              urlPattern: /^https?.*/,
              handler: 'NetworkFirst',
              options: {
                cacheName: 'offlineCache',
                expiration: {
                  maxEntries: 200,
                },
              },
            },
          ],
        },
        async rewrites() {
          return [
            {
              source: '/service-worker.js',
              destination: '/_next/static/service-worker.js',
            },
          ]
        },
      },
    ],
    withBundleAnalyzer,
  ],
  nextConfig
)