fix: accept every Node.js version from 26 in adapter-vercel (2.x)

.changeset/every-node-from-26-vercel.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/adapter-vercel': patch
+---
+
+fix: accept every Node.js version from 26 (`nodejs27.x`, `nodejs28.x`, ...), not only even ones

documentation/docs/25-build-and-deploy/90-adapter-vercel.md

@@ -42,7 +42,7 @@ export const config = {
 
 The following options apply to all functions:
 
-- `runtime`: `'edge'`, or an even Node version (for example `'nodejs20.x'`, `'nodejs22.x'`, `'nodejs24.x'`, `'nodejs26.x'`). By default, the adapter will select the `'nodejs<version>.x'` corresponding to the Node version your project is configured to use on the Vercel dashboard
+- `runtime`: `'edge'`, or a Node version (for example `'nodejs20.x'`, `'nodejs22.x'`, `'nodejs24.x'`, `'nodejs26.x'`). By default, the adapter will select the `'nodejs<version>.x'` corresponding to the Node version your project is configured to use on the Vercel dashboard
   > [!NOTE] This option is deprecated and will be removed in a future version, at which point all your functions will use whichever Node version is specified in the project configuration on Vercel
 - `regions`: an array of [edge network regions](https://vercel.com/docs/concepts/edge-network/regions) (defaulting to `["iad1"]` for serverless functions) or `'all'` if `runtime` is `edge` (its default). Note that multiple regions for serverless functions are only supported on Enterprise plans
 - `split`: if `true`, causes a route to be deployed as an individual function. If `split` is set to `true` at the adapter level, all routes will be deployed as individual functions

packages/adapter-vercel/test/utils.spec.js

@@ -186,19 +186,29 @@ describe('resolve_runtime', () => {
 		assert.equal(result, 'bun1.x');
 	});
 
-	test.each(['node18.x', 'nodejs028.x', 'nodejs18.x', 'nodejs33.x', 'nodejs100.x', 'nodejs2,.x'])(
-		'throws an error when resolving to an invalid runtime (%s)',
-		(runtime) => {
-			assert.throws(() => resolve_runtime(runtime), /Unsupported runtime/);
-		}
-	);
+	test.each([
+		'node18.x',
+		'nodejs028.x',
+		'nodejs18.x',
+		'nodejs23.x',
+		'nodejs25.x',
+		'nodejs100.x',
+		'nodejs2,.x'
+	])('throws an error when resolving to an invalid runtime (%s)', (runtime) => {
+		assert.throws(() => resolve_runtime(runtime), /Unsupported runtime/);
+	});
 
-	test.each(['nodejs20.x', 'nodejs22.x', 'nodejs24.x', 'nodejs26.x', 'nodejs96.x', 'nodejs98.x'])(
-		'accepts %s',
-		(runtime) => {
-			assert.equal(resolve_runtime(runtime), runtime);
-		}
-	);
+	test.each([
+		'nodejs20.x',
+		'nodejs22.x',
+		'nodejs24.x',
+		'nodejs26.x',
+		'nodejs27.x',
+		'nodejs33.x',
+		'nodejs99.x'
+	])('accepts %s', (runtime) => {
+		assert.equal(resolve_runtime(runtime), runtime);
+	});
 
 	test.each(['bun1.x', 'edge'])('accepts %s', (runtime) => {
 		assert.equal(resolve_runtime(runtime), runtime);
@@ -225,9 +235,10 @@ describe('resolve_runtime with node detected', () => {
 		['22.0.0', 'nodejs22.x'],
 		['24.1.0', 'nodejs24.x'],
 		['26.0.0', 'nodejs26.x'],
+		['27.0.0', 'nodejs27.x'],
 		['28.0.0', 'nodejs28.x'],
-		['96.1.0', 'nodejs96.x'],
-		['98.0.0', 'nodejs98.x']
+		['29.1.0', 'nodejs29.x'],
+		['99.0.0', 'nodejs99.x']
 	])('detects Node %s', (version, runtime) => {
 		with_node(version, () => {
 			assert.equal(resolve_runtime(undefined, undefined), runtime);
@@ -240,13 +251,13 @@ describe('resolve_runtime with node detected', () => {
 		});
 	});
 
-	test.each(['18.0.0', '25.0.0', '27.0.0'])(
+	test.each(['18.0.0', '23.0.0', '25.0.0'])(
 		'throws for an unsupported Node major (%s)',
 		(version) => {
 			with_node(version, () => {
 				assert.throws(
 					() => resolve_runtime(undefined, undefined),
-					/Unsupported Node\.js version.*Please use an even Node version to build your project/
+					/Unsupported Node\.js version.*Please use Node 20, 22, 24, or 26 and later to build your project/
 				);
 			});
 		}

packages/adapter-vercel/utils.js

@@ -118,7 +118,8 @@ export function resolve_runtime(default_key, override_key) {
 	return key;
 }
 
-const valid_node_version_regex = /^nodejs[2-9][02468]\.x$/;
+// Node 20, 22, 24, and every major from 26
+const valid_node_version_regex = /^nodejs(2[0246-9]|[3-9]\d)\.x$/;
 
 /** @returns {RuntimeKey} */
 function get_default_runtime() {
@@ -130,7 +131,7 @@ function get_default_runtime() {
 
 	if (!valid_node_version_regex.test(version_key)) {
 		throw new Error(
-			`Unsupported Node.js version: ${process.version}. Please use an even Node version to build your project, or explicitly specify a runtime in your adapter configuration.`
+			`Unsupported Node.js version: ${process.version}. Please use Node 20, 22, 24, or 26 and later to build your project, or explicitly specify a runtime in your adapter configuration.`
 		);
 	}
 
@@ -151,7 +152,7 @@ function assert_is_valid_runtime(key) {
 		!valid_node_version_regex.test(key)
 	) {
 		throw new Error(
-			`Unsupported runtime: ${key}. Supported runtimes are: ${valid_non_node_runtimes.join(', ')}, and even Node versions. See the Node.js Version section in your Vercel project settings for info on the currently supported versions.`
+			`Unsupported runtime: ${key}. Supported runtimes are: ${valid_non_node_runtimes.join(', ')}, and Node 20, 22, 24, or 26 and later. See the Node.js Version section in your Vercel project settings for info on the currently supported versions.`
 		);
 	}
 }