Mikro/astro.config.mjs

// @ts-check
import { defineConfig } from "astro/config";
import { nodePolyfills } from "vite-plugin-node-polyfills";

import node from "@astrojs/node";

// https://astro.build/config
export default defineConfig({
  output: "server",

  vite: {
    // @ts-ignore
    plugins: [nodePolyfills()],
  },

  server: {
    headers: {
      "Referrer-Policy": "no-referrer-when-downgrade",
    },
  },

  adapter: node({
    mode: "standalone",
  }),
});