feat: adapter features, deprecate astro configs

.changeset/fair-emus-divide.md

@@ -0,0 +1,39 @@
+---
+'astro': major
+'@astrojs/netlify': minor
+---
+
+The configuration `build.split` and `build.excludeMiddleware` are deprecated.
+
+Configuration that were inside the astro configuration, are now moved inside the adapter:
+
+```diff
+import {defineConfig} from "astro/config";
+import netlify from "@astrojs/netlify/functions";
+
+export default defineConfig({
+-    build: {
+-        excludeMiddleware: true
+-    },
+-    adapter: netlify()
++    adapter: netlify({
++        edgeMiddleware: true
++    })
+})
+```
+
+```diff
+import {defineConfig} from "astro/config";
+import netlify from "@astrojs/netlify/functions";
+
+export default defineConfig({
+-    build: {
+-        split: true
+-    },
+-    adapter: netlify()
++    adapter: netlify({
++        functionPerRoute: true
++    })
+})
+```
+

.changeset/tricky-candles-suffer.md

@@ -0,0 +1,39 @@
+---
+'astro': major
+'@astrojs/vercel': minor
+---
+
+The configuration `build.split` and `build.excludeMiddleware` are deprecated.
+
+Configuration that were inside the astro configuration, are now moved inside the adapter:
+
+```diff
+import {defineConfig} from "astro/config";
+import vercel from "@astrojs/vercel/serverless";
+
+export default defineConfig({
+-    build: {
+-        excludeMiddleware: true
+-    },
+-    adapter: vercel()
++    adapter: vercel({
++        edgeMiddleware: true
++    })
+})
+```
+
+```diff
+import {defineConfig} from "astro/config";
+import vercel from "@astrojs/vercel/serverless";
+
+export default defineConfig({
+-    build: {
+-        split: true
+-    },
+-    adapter: vercel()
++    adapter: vercel({
++        functionPerRoute: true
++    })
+})
+```
+

packages/astro/src/@types/astro.ts

@@ -1400,6 +1400,17 @@ export interface DataEntryType {
 
 export type GetDataEntryInfoReturnType = { data: Record<string, unknown>; rawData?: string };
 
+export interface AstroAdapterFeatures {
+	/**
+	 * Creates and edge function that will communiate with the Astro middleware
+	 */
+	edgeMiddleware: boolean;
+	/**
+	 * SSR only. Each route becomes its own function/file.
+	 */
+	functionPerRoute: boolean;
+}
+
 export interface AstroSettings {
 	config: AstroConfig;
 	adapter: AstroAdapter | undefined;
@@ -1664,6 +1675,7 @@ export interface AstroAdapter {
 	previewEntrypoint?: string;
 	exports?: string[];
 	args?: any;
+	adapterFeatures?: AstroAdapterFeatures;
 }
 
 type Body = string;

packages/astro/src/core/build/plugins/plugin-pages.ts

@@ -74,7 +74,11 @@ function vitePluginPages(opts: StaticBuildOptions, internals: BuildInternals): V
 						exports.push(`export { renderers };`);
 
 						// The middleware should not be imported by the pages
-						if (!opts.settings.config.build.excludeMiddleware) {
+						if (
+							// TODO: remover in Astro 4.0
+							!opts.settings.config.build.excludeMiddleware ||
+							opts.settings.adapter?.adapterFeatures?.edgeMiddleware === true
+						) {
 							const middlewareModule = await this.resolve(MIDDLEWARE_MODULE_ID);
 							if (middlewareModule) {
 								imports.push(`import { onRequest } from "${middlewareModule.id}";`);

packages/astro/src/core/build/plugins/plugin-ssr.ts

@@ -3,7 +3,7 @@ import { join } from 'node:path';
 import { fileURLToPath, pathToFileURL } from 'node:url';
 import type { Plugin as VitePlugin } from 'vite';
 import type { AstroAdapter, AstroConfig } from '../../../@types/astro';
-import { runHookBuildSsr } from '../../../integrations/index.js';
+import { isFunctionPerRouteEnabled, runHookBuildSsr } from '../../../integrations/index.js';
 import { isServerLikeOutput } from '../../../prerender/utils.js';
 import { BEFORE_HYDRATION_SCRIPT_ID, PAGE_SCRIPT_ID } from '../../../vite-plugin-scripts/index.js';
 import type { SerializedRouteInfo, SerializedSSRManifest } from '../../app/types';
@@ -103,12 +103,16 @@ export function pluginSSR(
 	internals: BuildInternals
 ): AstroBuildPlugin {
 	const ssr = isServerLikeOutput(options.settings.config);
+	const functionPerRouteEnabled = isFunctionPerRouteEnabled(options.settings.adapter);
 	return {
 		build: 'ssr',
 		hooks: {
 			'build:before': () => {
 				let vitePlugin =
-					ssr && !options.settings.config.build.split
+					ssr &&
+					// TODO: Remove in Astro 4.0
+					options.settings.config.build.split === false &&
+					functionPerRouteEnabled === false
 						? vitePluginSSR(internals, options.settings.adapter!, options)
 						: undefined;
 
@@ -122,7 +126,7 @@ export function pluginSSR(
 					return;
 				}
 
-				if (options.settings.config.build.split) {
+				if (options.settings.config.build.split || functionPerRouteEnabled) {
 					return;
 				}
 
@@ -155,11 +159,12 @@ function vitePluginSSRSplit(
 	adapter: AstroAdapter,
 	options: StaticBuildOptions
 ): VitePlugin {
+	const functionPerRouteEnabled = isFunctionPerRouteEnabled(options.settings.adapter);
 	return {
 		name: '@astrojs/vite-plugin-astro-ssr-split',
 		enforce: 'post',
 		options(opts) {
-			if (options.settings.config.build.split) {
+			if (options.settings.config.build.split || functionPerRouteEnabled) {
 				const inputs = new Set<string>();
 
 				for (const path of Object.keys(options.allPages)) {
@@ -229,12 +234,14 @@ export function pluginSSRSplit(
 	internals: BuildInternals
 ): AstroBuildPlugin {
 	const ssr = isServerLikeOutput(options.settings.config);
+	const functionPerRouteEnabled = isFunctionPerRouteEnabled(options.settings.adapter);
+
 	return {
 		build: 'ssr',
 		hooks: {
 			'build:before': () => {
 				let vitePlugin =
-					ssr && options.settings.config.build.split
+					ssr && (options.settings.config.build.split || functionPerRouteEnabled)
 						? vitePluginSSRSplit(internals, options.settings.adapter!, options)
 						: undefined;
 
@@ -247,7 +254,7 @@ export function pluginSSRSplit(
 				if (!ssr) {
 					return;
 				}
-				if (!options.settings.config.build.split) {
+				if (!options.settings.config.build.split && !functionPerRouteEnabled) {
 					return;
 				}
 
@@ -276,7 +283,7 @@ function generateSSRCode(config: AstroConfig, adapter: AstroAdapter) {
 	const imports: string[] = [];
 	const contents: string[] = [];
 	let pageMap;
-	if (config.build.split) {
+	if (config.build.split || isFunctionPerRouteEnabled(adapter)) {
 		pageMap = 'pageModule';
 	} else {
 		pageMap = 'pageMap';
@@ -337,7 +344,10 @@ export async function createManifest(
 	buildOpts: StaticBuildOptions,
 	internals: BuildInternals
 ): Promise<SerializedSSRManifest> {
-	if (buildOpts.settings.config.build.split) {
+	if (
+		buildOpts.settings.config.build.split ||
+		isFunctionPerRouteEnabled(buildOpts.settings.adapter)
+	) {
 		if (internals.ssrSplitEntryChunks.size === 0) {
 			throw new Error(`Did not generate an entry chunk for SSR in serverless mode`);
 		}

packages/astro/src/core/config/schema.ts

@@ -124,7 +124,15 @@ export const AstroConfigSchema = z.object({
 				.optional()
 				.default(ASTRO_CONFIG_DEFAULTS.build.inlineStylesheets),
 
+			/**
+			 * @deprecated
+			 * Use the adapter feature instead
+			 */
 			split: z.boolean().optional().default(ASTRO_CONFIG_DEFAULTS.build.split),
+			/**
+			 * @deprecated
+			 * Use the adapter feature instead
+			 */
 			excludeMiddleware: z
 				.boolean()
 				.optional()

packages/astro/src/integrations/index.ts

@@ -4,6 +4,7 @@ import type { AddressInfo } from 'node:net';
 import { fileURLToPath } from 'node:url';
 import type { InlineConfig, ViteDevServer } from 'vite';
 import type {
+	AstroAdapter,
 	AstroConfig,
 	AstroIntegration,
 	AstroRenderer,
@@ -410,3 +411,19 @@ export async function runHookBuildDone({ config, pages, routes, logging }: RunHo
 		}
 	}
 }
+
+export function isFunctionPerRouteEnabled(adapter: AstroAdapter | undefined): boolean {
+	if (adapter?.adapterFeatures?.functionPerRoute === true) {
+		return true;
+	} else {
+		return false;
+	}
+}
+
+export function isEdgeMiddlewareEnabled(adapter: AstroAdapter | undefined): boolean {
+	if (adapter?.adapterFeatures?.edgeMiddleware === true) {
+		return true;
+	} else {
+		return false;
+	}
+}

packages/integrations/netlify/src/integration-functions.ts

@@ -8,25 +8,33 @@ import { createRedirects } from './shared.js';
 export const NETLIFY_EDGE_MIDDLEWARE_FILE = 'netlify-edge-middleware';
 export const ASTRO_LOCALS_HEADER = 'x-astro-locals';
 
-export function getAdapter(args: Args = {}): AstroAdapter {
+export function getAdapter({ functionPerRoute, edgeMiddleware, ...args }: Args): AstroAdapter {
 	return {
 		name: '@astrojs/netlify/functions',
 		serverEntrypoint: '@astrojs/netlify/netlify-functions.js',
 		exports: ['handler'],
 		args,
+		adapterFeatures: {
+			functionPerRoute,
+			edgeMiddleware,
+		},
 	};
 }
 
 interface NetlifyFunctionsOptions {
 	dist?: URL;
 	builders?: boolean;
 	binaryMediaTypes?: string[];
+	edgeMiddleware?: boolean;
+	functionPerRoute?: boolean;
 }
 
 function netlifyFunctions({
 	dist,
 	builders,
 	binaryMediaTypes,
+	functionPerRoute = false,
+	edgeMiddleware = false,
 }: NetlifyFunctionsOptions = {}): AstroIntegration {
 	let _config: AstroConfig;
 	let _entryPoints: Map<RouteData, URL>;
@@ -53,7 +61,7 @@ function netlifyFunctions({
 				_entryPoints = entryPoints;
 			},
 			'astro:config:done': ({ config, setAdapter }) => {
-				setAdapter(getAdapter({ binaryMediaTypes, builders }));
+				setAdapter(getAdapter({ binaryMediaTypes, builders, functionPerRoute, edgeMiddleware }));
 				_config = config;
 				ssrEntryFile = config.build.serverEntry.replace(/\.m?js/, '');
 

packages/integrations/netlify/src/netlify-functions.ts

@@ -9,6 +9,8 @@ applyPolyfills();
 export interface Args {
 	builders?: boolean;
 	binaryMediaTypes?: string[];
+	edgeMiddleware: boolean;
+	functionPerRoute: boolean;
 }
 
 function parseContentType(header?: string) {

packages/integrations/netlify/test/functions/edge-middleware.test.js

@@ -10,6 +10,7 @@ describe('Middleware', () => {
 			output: 'server',
 			adapter: netlifyAdapter({
 				dist: new URL('./fixtures/middleware-with-handler-file/dist/', import.meta.url),
+				edgeMiddleware: true,
 			}),
 			site: `http://example.com`,
 			integrations: [testIntegration()],

packages/integrations/netlify/test/functions/split-support.test.js

@@ -13,6 +13,7 @@ describe('Split support', () => {
 			output: 'server',
 			adapter: netlifyAdapter({
 				dist: new URL('./fixtures/split-support/dist/', import.meta.url),
+				functionPerRoute: true,
 			}),
 			site: `http://example.com`,
 			integrations: [
@@ -22,9 +23,6 @@ describe('Split support', () => {
 					},
 				}),
 			],
-			build: {
-				split: true,
-			},
 		});
 		await fixture.build();
 	});

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

@@ -29,11 +29,21 @@ const SUPPORTED_NODE_VERSIONS: Record<
 	18: { status: 'current' },
 };
 
-function getAdapter(): AstroAdapter {
+function getAdapter({
+	edgeMiddleware,
+	functionPerRoute,
+}: {
+	edgeMiddleware: boolean;
+	functionPerRoute: boolean;
+}): AstroAdapter {
 	return {
 		name: PACKAGE_NAME,
 		serverEntrypoint: `${PACKAGE_NAME}/entrypoint`,
 		exports: ['default'],
+		adapterFeatures: {
+			edgeMiddleware,
+			functionPerRoute,
+		},
 	};
 }
 
@@ -43,6 +53,8 @@ export interface VercelServerlessConfig {
 	analytics?: boolean;
 	imageService?: boolean;
 	imagesConfig?: VercelImageConfig;
+	edgeMiddleware?: boolean;
+	functionPerRoute?: boolean;
 }
 
 export default function vercelServerless({
@@ -51,6 +63,8 @@ export default function vercelServerless({
 	analytics,
 	imageService,
 	imagesConfig,
+	functionPerRoute = false,
+	edgeMiddleware = false,
 }: VercelServerlessConfig = {}): AstroIntegration {
 	let _config: AstroConfig;
 	let buildTempFolder: URL;
@@ -112,7 +126,7 @@ export default function vercelServerless({
 			},
 			'astro:config:done': ({ setAdapter, config }) => {
 				throwIfAssetsNotEnabled(config, imageService);
-				setAdapter(getAdapter());
+				setAdapter(getAdapter({ functionPerRoute, edgeMiddleware }));
 				_config = config;
 				buildTempFolder = config.build.server;
 				serverEntry = config.build.serverEntry;

packages/integrations/vercel/test/fixtures/basic/astro.config.mjs

@@ -2,5 +2,7 @@ import { defineConfig } from 'astro/config';
 import vercel from '@astrojs/vercel/serverless';
 
 export default defineConfig({
-	adapter: vercel()
+	adapter: vercel({
+		functionPerRoute: true
+	})
 });