feat(amplify): support performance mode in Branch

packages/@aws-cdk/aws-amplify/README.md

@@ -97,7 +97,9 @@ Add branches:
 declare const amplifyApp: amplify.App;
 
 const master = amplifyApp.addBranch('master'); // `id` will be used as repo branch name
-const dev = amplifyApp.addBranch('dev');
+const dev = amplifyApp.addBranch('dev', {
+  performanceMode: true, // optional, enables performance mode
+});
 dev.addEnvironment('STAGE', 'dev');
 ```
 

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

@@ -114,6 +114,17 @@ export interface BranchOptions {
    * @default - no asset
    */
   readonly asset?: Asset
+
+  /**
+   * Enables performance mode for the branch.
+   *
+   * Performance mode optimizes for faster hosting performance by keeping content cached at the edge
+   * for a longer interval. When performance mode is enabled, hosting configuration or code changes
+   * can take up to 10 minutes to roll out.
+   *
+   * @default false
+   */
+  readonly performanceMode?: boolean;
 }
 
 /**
@@ -168,6 +179,7 @@ export class Branch extends Resource implements IBranch {
       environmentVariables: Lazy.any({ produce: () => renderEnvironmentVariables(this.environmentVariables) }, { omitEmptyArray: true }),
       pullRequestEnvironmentName: props.pullRequestEnvironmentName,
       stage: props.stage,
+      enablePerformanceMode: props.performanceMode,
     });
 
     this.arn = branch.attrArn;

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

@@ -162,3 +162,15 @@ test('with asset deployment', () => {
     },
   });
 });
+
+test('with performance mode', () => {
+  // WHEN
+  app.addBranch('dev', {
+    performanceMode: true,
+  });
+
+  // THEN
+  Template.fromStack(stack).hasResourceProperties('AWS::Amplify::Branch', {
+    EnablePerformanceMode: true,
+  });
+});