feature(@astrojs/cloudflare): port functionPerRoute

.changeset/nasty-garlics-listen.md

@@ -0,0 +1,5 @@
+---
+'astro': patch
+---
+
+Reimplement https://github.com/withastro/astro/pull/7509

.changeset/wise-cameras-agree.md

@@ -0,0 +1,22 @@
+---
+'@astrojs/cloudflare': major
+---
+
+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 cloudflare from '@astrojs/cloudflare';
+
+export default defineConfig({
+-    build: {
+-        split: true
+-    },
+-    adapter: cloudflare()
++    adapter: cloudflare({
++        functionPerRoute: true
++    })
+})
+```

packages/astro/src/core/build/generate.ts

@@ -158,7 +158,11 @@ export async function generatePages(opts: StaticBuildOptions, internals: BuildIn
 			if (pageData.route.prerender) {
 				const ssrEntryURLPage = createEntryURL(filePath, outFolder);
 				const ssrEntryPage = await import(ssrEntryURLPage.toString());
-				if (opts.settings.config.build.split) {
+				if (
+				  // TODO: remove in Astro 4.0
+					opts.settings.config.build.split ||
+					opts.settings.adapter?.adapterFeatures?.functionPerRoute
+				) {
 					// forcing to use undefined, so we fail in an expected way if the module is not even there.
 					const ssrEntry = ssrEntryPage?.manifest?.pageModule;
 					if (ssrEntry) {

packages/integrations/cloudflare/README.md

@@ -50,7 +50,18 @@ For most projects the adapter default of `advanced` will be sufficient; the `dis
 
 In directory mode, the adapter will compile the client side part of your app the same way by default, but moves the worker script into a `functions` folder in the project root. In this case, the adapter will only ever place a `[[path]].js` in that folder, allowing you to add additional plugins and pages middleware which can be checked into version control.
 
-With the build configuration `split: true`, the adapter instead compiles a separate bundle for each page. This option requires some manual maintenance of the `functions` folder. Files emitted by Astro will overwrite existing `functions` files with identical names, so you must choose unique file names for each file you manually add. Additionally, the adapter will never empty the `functions` folder of outdated files, so you must clean up the folder manually when you remove pages.
+In directory mode, the `functionPerPath` option compiles a sepearte bundle for each page. This option requires some manual maintenance of the `functions` folder. Files emitted by Astro will overwrite existing `functions` files with identical names, so you must choose unique file names for each file you manually add. Additionally, the adapter will never empty the `functions` folder of outdated files, so you must clean up the folder manually when you remove pages.
+
+```diff
+import {defineConfig} from "astro/config";
+import cloudflare from '@astrojs/cloudflare';
+
+export default defineConfig({
++    adapter: cloudflare({
++        functionPerRoute: true
++    })
+})
+```
 
 Note that this adapter does not support using [Cloudflare Pages Middleware](https://developers.cloudflare.com/pages/platform/functions/middleware/). Astro will bundle the [Astro middleware](https://docs.astro.build/en/guides/middleware/) into each page.
 

packages/integrations/cloudflare/src/index.ts

@@ -9,6 +9,7 @@ import glob from 'tiny-glob';
 
 type Options = {
 	mode: 'directory' | 'advanced';
+	functionPerRoute?: boolean;
 };
 
 interface BuildConfig {
@@ -18,12 +19,22 @@ interface BuildConfig {
 	split?: boolean;
 }
 
-export function getAdapter(isModeDirectory: boolean): AstroAdapter {
+export function getAdapter({
+	isModeDirectory,
+	functionPerRoute,
+}: {
+	isModeDirectory: boolean;
+	functionPerRoute: boolean;
+}): AstroAdapter {
 	return isModeDirectory
 		? {
 				name: '@astrojs/cloudflare',
 				serverEntrypoint: '@astrojs/cloudflare/server.directory.js',
 				exports: ['onRequest', 'manifest'],
+				adapterFeatures: {
+					functionPerRoute,
+					edgeMiddleware: false,
+				},
 				supportedAstroFeatures: {
 					hybridOutput: 'stable',
 					staticOutput: 'unsupported',
@@ -67,9 +78,11 @@ const potentialFunctionRouteTypes = ['endpoint', 'page'];
 export default function createIntegration(args?: Options): AstroIntegration {
 	let _config: AstroConfig;
 	let _buildConfig: BuildConfig;
-	const isModeDirectory = args?.mode === 'directory';
 	let _entryPoints = new Map<RouteData, URL>();
 
+	const isModeDirectory = args?.mode === 'directory';
+	const functionPerRoute = args?.functionPerRoute ?? false;
+
 	return {
 		name: '@astrojs/cloudflare',
 		hooks: {
@@ -84,7 +97,7 @@ export default function createIntegration(args?: Options): AstroIntegration {
 				});
 			},
 			'astro:config:done': ({ setAdapter, config }) => {
-				setAdapter(getAdapter(isModeDirectory));
+				setAdapter(getAdapter({ isModeDirectory, functionPerRoute }));
 				_config = config;
 				_buildConfig = config.build;
 
@@ -136,7 +149,8 @@ export default function createIntegration(args?: Options): AstroIntegration {
 					await fs.promises.mkdir(functionsUrl, { recursive: true });
 				}
 
-				if (isModeDirectory && _buildConfig.split) {
+				// TODO: remove _buildConfig.split in Astro 4.0
+				if (isModeDirectory && (_buildConfig.split || functionPerRoute)) {
 					const entryPointsURL = [..._entryPoints.values()];
 					const entryPaths = entryPointsURL.map((entry) => fileURLToPath(entry));
 					const outputUrl = new URL('$astro', _buildConfig.server);

packages/integrations/cloudflare/test/fixtures/function-per-route/astro.config.mjs

@@ -0,0 +1,15 @@
+import { defineConfig } from 'astro/config';
+import cloudflare from '@astrojs/cloudflare';
+
+export default defineConfig({
+  adapter: cloudflare({
+    mode: 'directory', 
+    functionPerRoute: true
+  }),
+  output: 'server',
+  vite: {
+    build: {
+      minify: false,
+    },
+  },
+});

packages/integrations/cloudflare/test/fixtures/split/package.json → packages/integrations/cloudflare/test/fixtures/function-per-route/package.json

@@ -1,5 +1,5 @@
 {
-  "name": "@test/astro-cloudflare-split",
+  "name": "@test/astro-cloudflare-function-per-route",
   "version": "0.0.0",
   "private": true,
   "dependencies": {

packages/integrations/cloudflare/test/directory-split.test.js → packages/integrations/cloudflare/test/function-per-route.test.js

@@ -1,25 +1,13 @@
 import { loadFixture } from './test-utils.js';
 import { expect } from 'chai';
-import cloudflare from '../dist/index.js';
 
-/** @type {import('./test-utils').Fixture} */
-describe('Cloudflare SSR split', () => {
+/** @type {import('./test-utils.js').Fixture} */
+describe('Cloudflare SSR functionPerRoute', () => {
 	let fixture;
 
 	before(async () => {
 		fixture = await loadFixture({
-			root: './fixtures/split/',
-			adapter: cloudflare({ mode: 'directory' }),
-			output: 'server',
-			build: {
-				split: true,
-				excludeMiddleware: false,
-			},
-			vite: {
-				build: {
-					minify: false,
-				},
-			},
+			root: './fixtures/function-per-route/',
 		});
 		await fixture.build();
 	});