feat: Add Node 24 support to Vercel adapter (#14982)

* feat: Add Node 24 support to Vercel adapter

* changeset

* tweak error message

Author: elliott-with-the-longest-name-on-github

.changeset/giant-sites-relate.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/adapter-vercel': minor
+---
+
+feat: Node 24 support

packages/adapter-vercel/index.d.ts

@@ -6,7 +6,7 @@ export default function plugin(config?: Config): Adapter;
 
 export interface ServerlessConfig {
 	/**
-	 * Whether to use [Edge Functions](https://vercel.com/docs/concepts/functions/edge-functions) (`'edge'`) or [Serverless Functions](https://vercel.com/docs/concepts/functions/serverless-functions) (`'nodejs18.x'`, `'nodejs20.x'` etc).
+	 * Whether to use [Edge Functions](https://vercel.com/docs/concepts/functions/edge-functions) (`'edge'`) or [Serverless Functions](https://vercel.com/docs/concepts/functions/serverless-functions) (`'nodejs22.x'`, `'nodejs24.x'` etc).
 	 * @default Same as the build environment
 	 */
 	runtime?: Exclude<RuntimeConfigKey, 'edge'>;
@@ -78,7 +78,7 @@ type ImagesConfig = {
 /** @deprecated */
 export interface EdgeConfig {
 	/**
-	 * Whether to use [Edge Functions](https://vercel.com/docs/concepts/functions/edge-functions) (`'edge'`) or [Serverless Functions](https://vercel.com/docs/concepts/functions/serverless-functions) (`'nodejs18.x'`, `'nodejs20.x'` etc).
+	 * Whether to use [Edge Functions](https://vercel.com/docs/concepts/functions/edge-functions) (`'edge'`) or [Serverless Functions](https://vercel.com/docs/concepts/functions/serverless-functions) (`'nodejs22.x'`, `'nodejs24.x'` etc).
 	 */
 	runtime?: 'edge';
 	/**

packages/adapter-vercel/index.js

@@ -285,7 +285,7 @@ const plugin = function (defaults = {}) {
 
 					if (runtime === 'edge') {
 						throw new Error(
-							`${directory}: Routes using \`isr\` must use a Node.js or Bun runtime (for example 'nodejs22.x' or 'experimental_bun1.x')`
+							`${directory}: Routes using \`isr\` must use a Node.js or Bun runtime (for example 'nodejs24.x' or 'experimental_bun1.x')`
 						);
 					}
 

packages/adapter-vercel/utils.js

@@ -120,23 +120,31 @@ export function resolve_runtime(default_key, override_key) {
 	return key;
 }
 
+const valid_node_versions = [20, 22, 24];
+
 /** @returns {RuntimeKey} */
 function get_default_runtime() {
 	// TODO may someday need to auto-detect Bun, but this will be complicated because you may want to run your build
 	// with Bun but not have your serverless runtime be in Bun. Vercel will likely have to attach something to `globalThis` or similar
 	// to tell us what the bun configuration is.
 	const major = Number(process.version.slice(1).split('.')[0]);
 
-	if (major !== 20 && major !== 22) {
+	if (!valid_node_versions.includes(major)) {
 		throw new Error(
-			`Unsupported Node.js version: ${process.version}. Please use Node 20 or 22 to build your project, or explicitly specify a runtime in your adapter configuration.`
+			`Unsupported Node.js version: ${process.version}. Please use Node ${valid_node_versions.slice(0, -1).join(', ')} or ${valid_node_versions.at(-1)} to build your project, or explicitly specify a runtime in your adapter configuration.`
 		);
 	}
 
-	return `nodejs${major}.x`;
+	return `nodejs${/** @type {20 | 22 | 24} */ (major)}.x`;
 }
 
-const valid_runtimes = /** @type {const} */ (['nodejs20.x', 'nodejs22.x', 'bun1.x', 'edge']);
+const valid_runtimes = /** @type {const} */ ([
+	'nodejs20.x',
+	'nodejs22.x',
+	'nodejs24.x',
+	'bun1.x',
+	'edge'
+]);
 
 /**
  * @param {string} key