fix(lambda-nodejs): AWS SDK v2 is not available for node18.x runtime

packages/@aws-cdk/aws-lambda-nodejs/lib/bundling.ts

@@ -113,7 +113,7 @@ export class Bundling implements cdk.BundlingOptions {
     }
 
     this.externals = [
-      ...props.externalModules ?? ['aws-sdk'], // Mark aws-sdk as external by default (available in the runtime)
+      ...props.externalModules ?? (isSdkV2Runtime(props.runtime) ? ['aws-sdk'] : ['@aws-sdk/*']), // Mark aws-sdk as external by default (available in the runtime)
       ...props.nodeModules ?? [], // Mark the modules that we are going to install as externals also
     ];
 
@@ -367,3 +367,17 @@ function toCliArgs(esbuildArgs: { [key: string]: string | boolean }): string {
 
   return args.join(' ');
 }
+
+function isSdkV2Runtime(runtime: Runtime): boolean {
+  const sdkV2RuntimeList = [
+    Runtime.NODEJS,
+    Runtime.NODEJS_4_3,
+    Runtime.NODEJS_6_10,
+    Runtime.NODEJS_8_10,
+    Runtime.NODEJS_10_X,
+    Runtime.NODEJS_12_X,
+    Runtime.NODEJS_14_X,
+    Runtime.NODEJS_16_X,
+  ];
+  return sdkV2RuntimeList.includes(runtime);
+}

packages/@aws-cdk/aws-lambda-nodejs/lib/types.ts

@@ -183,7 +183,7 @@ export interface BundlingOptions {
    * A list of modules that should be considered as externals (already available
    * in the runtime).
    *
-   * @default ['aws-sdk']
+   * @default - ['aws-sdk'] if the runtime is < Node.js 18.x, ['@aws-sdk/*'] otherwise.
    */
   readonly externalModules?: string[];
 

packages/@aws-cdk/aws-lambda-nodejs/test/bundling.test.ts

@@ -282,6 +282,27 @@ test('esbuild bundling source map default', () => {
   });
 });
 
+test('esbuild bundling without aws-sdk v3 when use greater than or equal Runtime.NODEJS_18_X', () => {
+  Bundling.bundle({
+    entry,
+    projectRoot,
+    depsLockFilePath,
+    runtime: Runtime.NODEJS_18_X,
+    architecture: Architecture.X86_64,
+  });
+
+  // Correctly bundles with esbuild
+  expect(Code.fromAsset).toHaveBeenCalledWith(path.dirname(depsLockFilePath), {
+    assetHashType: AssetHashType.OUTPUT,
+    bundling: expect.objectContaining({
+      command: [
+        'bash', '-c',
+        'esbuild --bundle "/asset-input/lib/handler.ts" --target=node18 --platform=node --outfile="/asset-output/index.js" --external:@aws-sdk/*',
+      ],
+    }),
+  });
+});
+
 test('esbuild bundling source map inline', () => {
   Bundling.bundle({
     entry,

packages/@aws-cdk/aws-lambda-nodejs/test/integ-handlers/dependencies-sdk-v3.ts

@@ -0,0 +1,9 @@
+/* eslint-disable no-console */
+// @ts-ignore
+import { S3Client } from '@aws-sdk/client-s3'; // eslint-disable-line import/no-extraneous-dependencies, import/no-unresolved
+
+const s3 = new S3Client();
+
+export async function handler() {
+  console.log(s3);
+}