Vercel adapter default changes

.changeset/silly-dolphins-try.md

@@ -0,0 +1,9 @@
+---
+'@astrojs/vercel': major
+---
+
+Vercel adapter now defaults to a function per route
+
+With this change, `@astrojs/vercel/serverless` now splits each route into its own function. By doing this, the size of each function is reduced and startup time is faster.
+
+You can disable this option, which will cause the code to be bundled into a single function, by setting `functionPerRoute` to false.

packages/integrations/vercel/README.md

@@ -210,9 +210,11 @@ export default defineConfig({
 });
 ```
 
-### Per-page functions
+### Function bundling configuration
 
-The Vercel adapter builds to a single function by default. Astro 2.7 added support for splitting your build into separate entry points per page. If you use this configuration the Vercel adapter will generate a separate function for each page. This can help reduce the size of each function so they are only bundling code used on that page.
+The Vercel adapter splits builds into a separate function per route by default. This helps reduce the size of each function, as it only bundles code used on that page.
+
+You can disable this and build to a single function by setting the `functionPerRoute` configuration option to `false`:
 
 ```js
 // astro.config.mjs
@@ -222,7 +224,7 @@ import vercel from '@astrojs/vercel/serverless';
 export default defineConfig({
   output: 'server',
   adapter: vercel({
-    functionPerRoute: true,
+    functionPerRoute: false,
   }),
 });
 ```

packages/integrations/vercel/src/edge/adapter.ts

@@ -0,0 +1 @@
+import './throw.js';

packages/integrations/vercel/src/edge/entrypoint.ts

@@ -0,0 +1 @@
+import './throw.js';

packages/integrations/vercel/src/edge/throw.ts

@@ -0,0 +1,18 @@
+const msg = `
+The Astro Vercel Edge adapter has been removed. We recommend switching to @astrojs/vercel/serverless and enabling Edge middleware.
+
+import { defineConfig } from 'astro/config';
+import vercel from '@astrojs/vercel/serverless';
+
+export default defineConfig({
+	output: 'server',
+	adapter: vercel({
+		edgeMiddleware: true,
+	})
+})
+`.trim();
+
+throw new Error(msg);
+
+// Make sure bundlers treat this as ESM.
+export default {};

packages/integrations/vercel/src/serverless/adapter.ts

@@ -68,7 +68,7 @@ export default function vercelServerless({
 	analytics,
 	imageService,
 	imagesConfig,
-	functionPerRoute = false,
+	functionPerRoute = true,
 	edgeMiddleware = false,
 }: VercelServerlessConfig = {}): AstroIntegration {
 	let _config: AstroConfig;

packages/integrations/vercel/test/fixtures/serverless-prerender/astro.config.mjs

@@ -4,7 +4,8 @@ import vercel from '@astrojs/vercel/serverless';
 export default defineConfig({
 	adapter: vercel({
 		// Pass some value to make sure it doesn't error out
-		includeFiles: ['included.js']
+		includeFiles: ['included.js'],
+		functionPerRoute: false,
 	}),
 	output: 'server'
 });