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.changeset/famous-coins-destroy.md

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+---
+'astro': minor
+'@astrojs/cloudflare': minor
+'@astrojs/deno': minor
+'@astrojs/image': minor
+'@astrojs/netlify': minor
+'@astrojs/node': minor
+'@astrojs/sitemap': minor
+'@astrojs/vercel': minor
+---
+
+New `mode` configuration option
+
+This change introduces a new configuration option `mode`. Mode can be either
+
+* `static` - The default, when building a static site.
+* `server` - When building an app to be deployed for SSR (server-side rendering).
+
+The default, `static`, can be omitted from your config file.
+
+If you want to use SSR you now need to provide `mode: 'server'` *in addition* to an adapter.
+
+The `adapter` configuration has been renamed to `deploy`. In the future adapters will support configuring a static site as well!
+
+For SSR make this change:
+
+```diff
+import { defineConfig } from 'astro/config';
+import netlify from '@astrojs/netlify/functions';
+
+export default defineConfig({
+-  adapter: netlify(),
++  deploy: netlify(),
++  mode: 'server',
+});
+```