rsnext/examples/next-offline/next.config.js

// @ts-check
const withOffline = require("next-offline");

/**
 * @type {import('next').NextConfig}
 **/
const nextConfig = {
  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",
      },
    ];
  },
};

module.exports = withOffline(nextConfig);