handle node built-in modules

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

@@ -438,15 +438,18 @@ function getRuntime(process: NodeJS.Process, logger: AstroIntegrationLogger): Ru
  `\tYour project will use Node.js 18 as the runtime instead.\n` +
  `\tConsider switching your local version to 18.\n`
  );
+ return 'nodejs18.x';
  }
  if (support.status === 'current') {
  return `nodejs${major}.x`;
- } else if (support?.status === 'beta') {
+ }
+ if (support.status === 'beta') {
  logger.warn(
  `Your project is being built for Node.js ${major} as the runtime, which is currently in beta for Vercel Serverless Functions.`
  );
  return `nodejs${major}.x`;
- } else if (support.status === 'deprecated') {
+ }
+ if (support.status === 'deprecated') {
  const removeDate = new Intl.DateTimeFormat(undefined, { dateStyle: 'long' }).format(
  support.removal
  );
@@ -458,11 +461,5 @@ function getRuntime(process: NodeJS.Process, logger: AstroIntegrationLogger): Ru
  );
  return `nodejs${major}.x`;
  }
- logger.warn(
- `\n` +
- `\tThe local Node.js version (${major}) is not supported by Vercel Serverless Functions.\n` +
- `\tYour project will use Node.js 18 as the runtime instead.\n` +
- `\tConsider switching your local version to 18.\n`
- );
  return 'nodejs18.x';
 }

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

@@ -1,6 +1,6 @@
 import { existsSync } from 'node:fs';
 import { fileURLToPath, pathToFileURL } from 'node:url';
-import { ASTRO_LOCALS_HEADER } from './adapter.js';
+import { builtinModules } from 'node:module';
 
 /**
  * It generates the Vercel Edge Middleware file.
@@ -36,6 +36,13 @@ export async function generateEdgeMiddleware(
  format: 'esm',
  bundle: true,
  minify: false,
+ plugins: [{
+ name: 'esbuild-namespace-node-built-in-modules',
+ setup(build) {
+ const filter = new RegExp(builtinModules.map((mod) => `(^${mod}$)`).join('|'));
+ build.onResolve({ filter }, (args) => ({ path: 'node:' + args.path, external: true }));
+ },
+ }]
  });
  return pathToFileURL(bundledFilePath);
 }