feat: support split edge functions

.changeset/green-pens-split.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/adapter-netlify': minor
+---
+
+feat: support using `edge` and `split` together

.github/actions/netlify-deploy/action.yml

@@ -11,6 +11,9 @@ inputs:
   netlify-token:
     description: 'Netlify authentication token'
     required: true
+  edge:
+    description: 'Used to enable edge functions for the split test app'
+    default: false
 outputs:
   deployment-url:
     description: 'URL of the deployed preview'
@@ -32,6 +35,7 @@ runs:
         TEST_APP_DIR: ${{ inputs.test-app-dir }}
         NETLIFY_AUTH_TOKEN: ${{ inputs.netlify-token }}
         NETLIFY_PROJECT_ID: ${{ inputs.netlify-project-id }}
+        EDGE: ${{ inputs.edge }}
       run: |
         TEST_APP_NAME=$(cat "$TEST_APP_DIR/package.json" | jq -r '.name')
         echo "url=$(netlify deploy --json --filter="$TEST_APP_NAME" --dir="$TEST_APP_DIR/build" --functions=".netlify/v1/functions" --auth="$NETLIFY_AUTH_TOKEN" --site="$NETLIFY_PROJECT_ID" | jq -r '.deploy_url')" >> "$GITHUB_OUTPUT"

.github/workflows/platform-tests-netlify.yml

@@ -121,3 +121,29 @@ jobs:
         with:
           test-app-dir: ${{ env.TEST_APP_DIR }}
           deployment-url: ${{ steps.deploy.outputs.deployment-url }}
+
+  test-split-edge:
+    if: github.repository == 'sveltejs/kit'
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    environment: '@sveltejs/adapter-netlify platform tests'
+    env:
+      TEST_APP_DIR: packages/adapter-netlify/test/apps/split
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          ref: ${{ inputs.sha || github.sha }}
+          persist-credentials: false
+
+      - uses: ./.github/actions/netlify-deploy
+        id: deploy
+        with:
+          test-app-dir: ${{ env.TEST_APP_DIR }}
+          netlify-project-id: ${{ secrets.NETLIFY_PROJECT_ID_SPLIT }}
+          netlify-token: ${{ secrets.NETLIFY_TOKEN }}
+          edge: true
+
+      - uses: ./.github/actions/platform-test
+        with:
+          test-app-dir: ${{ env.TEST_APP_DIR }}
+          deployment-url: ${{ steps.deploy.outputs.deployment-url }}

documentation/docs/25-build-and-deploy/80-adapter-netlify.md

@@ -52,8 +52,6 @@ If `true`, your app will be deployed as a [Netlify Edge Function](https://docs.n
 
 If `true`, your app will be split into multiple functions instead of a single one for the entire app.
 
-If `edge` is `true`, this option cannot be used.
-
 ## Netlify alternatives to SvelteKit functionality
 
 You may build your app using functionality provided directly by SvelteKit without relying on any Netlify functionality. Using the SvelteKit versions of these features will allow them to be used in dev mode, tested with integration tests, and to work with other adapters should you ever decide to switch away from Netlify. However, in some scenarios you may find it beneficial to use the Netlify versions of these features. One example would be if you're migrating an app that's already hosted on Netlify to SvelteKit.

packages/adapter-netlify/files/edge.js

@@ -1,41 +1,42 @@
-import { server } from '0SERVER';
+/** @param {import('@sveltejs/kit').Server} server */
+export function init(server) {
+	/**
+	 * We don't know the origin until we receive a request, but
+	 * that's guaranteed to happen before we call `read`
+	 * @type {string}
+	 */
+	let origin;
 
-/**
- * We don't know the origin until we receive a request, but
- * that's guaranteed to happen before we call `read`
- * @type {string}
- */
-let origin;
+	const initialized = server.init({
+		env: Deno.env.toObject(),
+		read: async (file) => {
+			const url = `${origin}/${file}`;
+			const response = await fetch(url);
 
-const initialized = server.init({
-	env: Deno.env.toObject(),
-	read: async (file) => {
-		const url = `${origin}/${file}`;
-		const response = await fetch(url);
+			if (!response.ok) {
+				throw new Error(
+					`read(...) failed: could not fetch ${url} (${response.status} ${response.statusText})`
+				);
+			}
 
-		if (!response.ok) {
-			throw new Error(
-				`read(...) failed: could not fetch ${url} (${response.status} ${response.statusText})`
-			);
+			return response.body;
 		}
+	});
 
-		return response.body;
-	}
-});
-
-/** @type {import('@netlify/edge-functions').EdgeFunction} */
-export default async function handler(request, context) {
-	if (!origin) {
-		origin = new URL(request.url).origin;
-	}
+	/** @type {import('@netlify/edge-functions').EdgeFunction} */
+	return async function handler(request, context) {
+		if (!origin) {
+			origin = new URL(request.url).origin;
+		}
 
-	// always await initialization to prevent race condition with concurrent requests
-	await initialized;
+		// always await initialization to prevent race condition with concurrent requests
+		await initialized;
 
-	return server.respond(request, {
-		platform: { context },
-		getClientAddress() {
-			return context.ip;
-		}
-	});
+		return server.respond(request, {
+			platform: { context },
+			getClientAddress() {
+				return context.ip;
+			}
+		});
+	};
 }

packages/adapter-netlify/index.d.ts

@@ -9,8 +9,6 @@ export interface AdapterOptions {
 	edge?: boolean;
 	/**
 	 * If `true`, your app will be split into multiple functions instead of a single one for the entire app.
-	 *
-	 * If `edge` is `true`, this option cannot be used.
 	 * @default false
 	 */
 	split?: boolean;