Exercise 2: Server Output From Day One — Possible Solution
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CONFIGURATION
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Per this chapter:

npm install @astrojs/node

// astro.config.mjs
import { defineConfig } from 'astro/config';
import node from '@astrojs/node';

export default defineConfig({
  output: 'server',
  adapter: node({ mode: 'standalone' }),
});

CONFIRMATION
------------------------------
Running npm run dev after this change still starts the dev server correctly and serves the default starter page exactly as before - output: 'server' changes how the project builds and deploys, not how the dev server itself behaves day to day.

WHY THIS WORKS AS AN ANSWER
------------------------------
It correctly shows the required package install and config change, and correctly confirms that switching to server output this early causes no disruption to the normal development workflow.