feat(@astrojs/netlify): add `build.split` support (#7615)

Co-authored-by: Sarah Rainsberger <sarah@rainsberger.ca>
Co-authored-by: Bjorn Lu <bjornlu.dev@gmail.com>

4 files changed, 51 insertions, 15 deletions

diff --git a/packages/integrations/netlify/src/integration-edge-functions.ts b/packages/integrations/netlify/src/integration-edge-functions.ts
index 2f65bccda..72721bd59 100644
--- a/packages/integrations/netlify/src/integration-edge-functions.ts
+++ b/packages/integrations/netlify/src/integration-edge-functions.ts
@@ -166,7 +166,12 @@ export function netlifyEdgeFunctions({ dist }: NetlifyEdgeFunctionsOptions = {})
 			'astro:build:done': async ({ routes, dir }) => {
 				await bundleServerEntry(_buildConfig, _vite);
 				await createEdgeManifest(routes, entryFile, _config.root);
-				await createRedirects(_config, routes, dir, entryFile, 'edge-functions');
+				const dynamicTarget = `/.netlify/edge-functions/${entryFile}`;
+				const map: [RouteData, string][] = routes.map((route) => {
+					return [route, dynamicTarget];
+				});
+				const routeToDynamicTargetMap = new Map(Array.from(map));
+				await createRedirects(_config, routeToDynamicTargetMap, dir);
 			},
 		},
 	};
diff --git a/packages/integrations/netlify/src/integration-functions.ts b/packages/integrations/netlify/src/integration-functions.ts
index 348b007f5..5442079d0 100644
--- a/packages/integrations/netlify/src/integration-functions.ts
+++ b/packages/integrations/netlify/src/integration-functions.ts
@@ -1,6 +1,8 @@
-import type { AstroAdapter, AstroConfig, AstroIntegration } from 'astro';
+import type { AstroAdapter, AstroConfig, AstroIntegration, RouteData } from 'astro';
 import type { Args } from './netlify-functions.js';
 import { createRedirects } from './shared.js';
+import { fileURLToPath } from 'node:url';
+import { extname } from 'node:path';
 
 export function getAdapter(args: Args = {}): AstroAdapter {
 	return {
@@ -23,7 +25,8 @@ function netlifyFunctions({
 	binaryMediaTypes,
 }: NetlifyFunctionsOptions = {}): AstroIntegration {
 	let _config: AstroConfig;
-	let entryFile: string;
+	let _entryPoints: Map<RouteData, URL>;
+	let ssrEntryFile: string;
 	return {
 		name: '@astrojs/netlify',
 		hooks: {
@@ -37,10 +40,13 @@ function netlifyFunctions({
 					},
 				});
 			},
+			'astro:build:ssr': ({ entryPoints }) => {
+				_entryPoints = entryPoints;
+			},
 			'astro:config:done': ({ config, setAdapter }) => {
 				setAdapter(getAdapter({ binaryMediaTypes, builders }));
 				_config = config;
-				entryFile = config.build.serverEntry.replace(/\.m?js/, '');
+				ssrEntryFile = config.build.serverEntry.replace(/\.m?js/, '');
 
 				if (config.output === 'static') {
 					console.warn(
@@ -53,7 +59,32 @@ function netlifyFunctions({
 			},
 			'astro:build:done': async ({ routes, dir }) => {
 				const type = builders ? 'builders' : 'functions';
-				await createRedirects(_config, routes, dir, entryFile, type);
+				const kind = type ?? 'functions';
+
+				if (_entryPoints.size) {
+					const routeToDynamicTargetMap = new Map();
+					for (const [route, entryFile] of _entryPoints) {
+						const wholeFileUrl = fileURLToPath(entryFile);
+
+						const extension = extname(wholeFileUrl);
+						const relative = wholeFileUrl
+							.replace(fileURLToPath(_config.build.server), '')
+							.replace(extension, '')
+							.replaceAll('\\', '/');
+						const dynamicTarget = `/.netlify/${kind}/${relative}`;
+
+						routeToDynamicTargetMap.set(route, dynamicTarget);
+					}
+					await createRedirects(_config, routeToDynamicTargetMap, dir);
+				} else {
+					const dynamicTarget = `/.netlify/${kind}/${ssrEntryFile}`;
+					const map: [RouteData, string][] = routes.map((route) => {
+						return [route, dynamicTarget];
+					});
+					const routeToDynamicTargetMap = new Map(Array.from(map));
+
+					await createRedirects(_config, routeToDynamicTargetMap, dir);
+				}
 			},
 		},
 	};
diff --git a/packages/integrations/netlify/src/integration-static.ts b/packages/integrations/netlify/src/integration-static.ts
index 78d0bb4b0..af2849867 100644
--- a/packages/integrations/netlify/src/integration-static.ts
+++ b/packages/integrations/netlify/src/integration-static.ts
@@ -1,4 +1,4 @@
-import type { AstroIntegration } from 'astro';
+import type { AstroIntegration, RouteData } from 'astro';
 import { createRedirects } from './shared.js';
 
 export function netlifyStatic(): AstroIntegration {
@@ -18,7 +18,12 @@ export function netlifyStatic(): AstroIntegration {
 				_config = config;
 			},
 			'astro:build:done': async ({ dir, routes }) => {
-				await createRedirects(_config, routes, dir, '', 'static');
+				const mappedRoutes: [RouteData, string][] = routes.map((route) => [
+					route,
+					`/.netlify/static/`,
+				]);
+				const routesToDynamicTargetMap = new Map(Array.from(mappedRoutes));
+				await createRedirects(_config, routesToDynamicTargetMap, dir);
 			},
 		},
 	};
diff --git a/packages/integrations/netlify/src/shared.ts b/packages/integrations/netlify/src/shared.ts
index e4aabd824..ca45dc752 100644
--- a/packages/integrations/netlify/src/shared.ts
+++ b/packages/integrations/netlify/src/shared.ts
@@ -4,20 +4,15 @@ import fs from 'node:fs';
 
 export async function createRedirects(
 	config: AstroConfig,
-	routes: RouteData[],
-	dir: URL,
-	entryFile: string,
-	type: 'functions' | 'edge-functions' | 'builders' | 'static'
+	routeToDynamicTargetMap: Map<RouteData, string>,
+	dir: URL
 ) {
-	const kind = type ?? 'functions';
-	const dynamicTarget = `/.netlify/${kind}/${entryFile}`;
 	const _redirectsURL = new URL('./_redirects', dir);
 
 	const _redirects = createRedirectsFromAstroRoutes({
 		config,
-		routes,
+		routeToDynamicTargetMap,
 		dir,
-		dynamicTarget,
 	});
 	const content = _redirects.print();