fix(vercel): clamp runtime config to valid node versions (#2819)

Author: cjpearson

src/presets/vercel/utils.ts

@@ -10,13 +10,28 @@ import type {
   VercelServerlessFunctionConfig,
 } from "./types";
 
+// https://vercel.com/docs/functions/runtimes/node-js/node-js-versions
+const SUPPORTED_NODE_VERSIONS = [16, 18, 20, 22];
+
+function getSystemNodeVersion() {
+  const systemNodeVersion = Number.parseInt(
+    process.versions.node.split(".")[0]
+  );
+
+  return Number.isNaN(systemNodeVersion) ? 20 : systemNodeVersion;
+}
+
 export async function generateFunctionFiles(nitro: Nitro) {
   const buildConfigPath = resolve(nitro.options.output.dir, "config.json");
   const buildConfig = generateBuildConfig(nitro);
   await writeFile(buildConfigPath, JSON.stringify(buildConfig, null, 2));
 
-  const systemNodeVersion = process.versions.node.split(".")[0];
-  const runtimeVersion = `nodejs${systemNodeVersion}.x`;
+  const systemNodeVersion = getSystemNodeVersion();
+  const usedNodeVersion =
+    SUPPORTED_NODE_VERSIONS.find((version) => version >= systemNodeVersion) ??
+    SUPPORTED_NODE_VERSIONS.at(-1);
+
+  const runtimeVersion = `nodejs${usedNodeVersion}.x`;
   const functionConfigPath = resolve(
     nitro.options.output.serverDir,
     ".vc-config.json"