feat(amplify) Add platform property to Amplify AppProps

Adds AppPlatforms enum for WEB, WEB_COMPUTE or WEB_DYNAMIC
Adds platform property to AppProps
Passes platform property to declared Amplify app

fixes aws#24076

packages/@aws-cdk/aws-amplify/lib/app.ts

@@ -66,6 +66,15 @@ export interface ISourceCodeProvider {
   bind(app: App): SourceCodeProviderConfig;
 }
 
+/**
+ * The platform for the Amplify app.
+ */
+export enum AppPlatforms {
+  WEB = 'WEB',
+  WEB_COMPUTE = 'WEB_COMPUTE',
+  WEB_DYNAMIC = 'WEB_DYNAMIC',
+}
+
 /**
  * Properties for an App
  */
@@ -159,6 +168,16 @@ export interface AppProps {
    * @default - a new role is created
    */
   readonly role?: iam.IRole;
+
+  /**
+   *  The platform for the Amplify app.
+   *  For a static app, set the platform type to WEB.
+   *  For a dynamic server-side rendered (SSR) app, set the platform type to WEB_COMPUTE.
+   *  For an app requiring Amplify Hosting's original SSR support only, set the platform type to WEB_DYNAMIC.
+   *
+   * @default WEB
+   */
+  readonly platform?: AppPlatforms;
 }
 
 /**
@@ -249,6 +268,7 @@ export class App extends Resource implements IApp, iam.IGrantable {
       oauthToken: sourceCodeProviderOptions?.oauthToken?.unsafeUnwrap(), // Safe usage
       repository: sourceCodeProviderOptions?.repository,
       customHeaders: props.customResponseHeaders ? renderCustomResponseHeaders(props.customResponseHeaders) : undefined,
+      platform: props.platform,
     });
 
     this.appId = app.attrAppId;

packages/@aws-cdk/aws-amplify/test/app.test.ts

@@ -3,6 +3,7 @@ import * as codebuild from '@aws-cdk/aws-codebuild';
 import * as codecommit from '@aws-cdk/aws-codecommit';
 import { SecretValue, Stack } from '@aws-cdk/core';
 import * as amplify from '../lib';
+import { AppPlatforms } from '../lib';
 
 let stack: Stack;
 beforeEach(() => {
@@ -442,3 +443,20 @@ test('with custom headers', () => {
     },
   });
 });
+
+test('with WEB_COMPUTE platform', () => {
+  // WHEN
+  new amplify.App(stack, 'App', {
+    sourceCodeProvider: new amplify.GitHubSourceCodeProvider({
+      owner: 'aws',
+      repository: 'aws-cdk',
+      oauthToken: SecretValue.unsafePlainText('secret'),
+    }),
+    platform: AppPlatforms.WEB_COMPUTE
+  });
+
+  // THEN
+  Template.fromStack(stack).hasResourceProperties('AWS::Amplify::App', {
+    Platform: "WEB_COMPUTE",
+  });
+});