chore(vercel): Add beta option for status

.changeset/stupid-cheetahs-sell.md

@@ -0,0 +1,5 @@
+---
+'@astrojs/vercel': minor
+---
+
+Update supported Node versions and add `beta` option.

packages/integrations/vercel/README.md

@@ -401,6 +401,18 @@ When you opt in to this feature, there are few constraints to note:
 - Only `request` and `context` may be used to produce an `Astro.locals` object. Operations like redirects, etc. should be delegated to Astro middleware.
 - `Astro.locals` **must be serializable**. Failing to do so will result in a **runtime error**. This means that you **cannot** store complex types like `Map`, `function`, `Set`, etc.
 
+### Node.js Version Support and Runtime Validation
+
+The `@astrojs/vercel` adapter supports specific Node.js versions for deploying your Astro project on Vercel. The supported versions are categorized as 'current', 'beta', and 'deprecated'. Each category represents the support status of that Node.js version:
+
+- **Current**: Fully supported and recommended for use.
+- **Beta**: Newer versions that are in beta. These are available for testing and early adoption.
+- **Deprecated**: Versions that are no longer recommended and scheduled for removal on a specific date.
+
+#### Supported Node.js Versions
+
+To view the supported Node.js versions, click on the settings tab for a project and scroll down to "Node.js Version" section.
+
 ## Troubleshooting
 
 **A few known complex packages (example: [puppeteer](https://github.com/puppeteer/puppeteer)) do not support bundling and therefore will not work properly with this adapter.** By default, Vercel doesn't include npm installed files & packages from your project's `./node_modules` folder. To address this, the `@astrojs/vercel` adapter automatically bundles your final build output using `esbuild`.

packages/integrations/vercel/src/serverless/adapter.ts

@@ -35,11 +35,11 @@ export const VERCEL_EDGE_MIDDLEWARE_FILE = 'vercel-edge-middleware';
 // https://vercel.com/docs/concepts/functions/serverless-functions/runtimes/node-js#node.js-version
 const SUPPORTED_NODE_VERSIONS: Record<
 	string,
-	{ status: 'current' } | { status: 'deprecated'; removal: Date }
+	{ status: 'current' } | { status: 'beta' } | { status: 'deprecated'; removal: Date }
 > = {
-	14: { status: 'deprecated', removal: new Date('August 15 2023') },
 	16: { status: 'deprecated', removal: new Date('February 6 2024') },
 	18: { status: 'current' },
+	20: { status: 'beta' },
 };
 
 function getAdapter({
@@ -377,6 +377,13 @@ function validateRuntime() {
 	const version = process.version.slice(1); // 'v16.5.0' --> '16.5.0'
 	const major = version.split('.')[0]; // '16.5.0' --> '16'
 	const support = SUPPORTED_NODE_VERSIONS[major];
+	if (support.status === 'beta') {
+		console.warn(
+			`[${PACKAGE_NAME}] The local Node.js version (${major}) is currently in beta for Vercel Serverless Functions.`
+		);
+		console.warn(`[${PACKAGE_NAME}] Make sure to update your Vercel settings to use ${major}.`);
+		return;
+	}
 	if (support === undefined) {
 		console.warn(
 			`[${PACKAGE_NAME}] The local Node.js version (${major}) is not supported by Vercel Serverless Functions.`