Mikro/astro.config.mjs

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

// https://astro.build/config
export default defineConfig({
  output: "server",
  vite: {
    // @ts-ignore
    plugins: [nodePolyfills()],
  },
});