fix(apigateway): cannot configure stage for SpecRestApi

packages/@aws-cdk/aws-apigateway/lib/base-path-mapping.ts

@@ -2,7 +2,7 @@ import { Resource, Token } from '@aws-cdk/core';
 import { Construct } from 'constructs';
 import { CfnBasePathMapping } from './apigateway.generated';
 import { IDomainName } from './domain-name';
-import { IRestApi, RestApi } from './restapi';
+import { IRestApi, RestApiBase } from './restapi';
 import { Stage } from './stage';
 
 export interface BasePathMappingOptions {
@@ -55,7 +55,7 @@ export class BasePathMapping extends Resource {
 
     // if restApi is an owned API and it has a deployment stage, map all requests
     // to that stage. otherwise, the stage will have to be specified in the URL.
-    const stage = props.stage ?? (props.restApi instanceof RestApi
+    const stage = props.stage ?? (props.restApi instanceof RestApiBase
       ? props.restApi.deploymentStage
       : undefined);
 

packages/@aws-cdk/aws-apigateway/test/test.domains.ts

@@ -443,4 +443,63 @@ export = {
     test.done();
   },
 
+  'base path mapping configures stage for RestApi creation'(test: Test) {
+    // GIVEN
+    const stack = new Stack();
+    new apigw.RestApi(stack, 'restApiWithStage', {
+      domainName: {
+        domainName: 'example.com',
+        certificate: acm.Certificate.fromCertificateArn(stack, 'cert', 'arn:aws:acm:us-east-1:1111111:certificate/11-3336f1-44483d-adc7-9cd375c5169d'),
+        endpointType: apigw.EndpointType.REGIONAL,
+      },
+    }).root.addMethod('GET');
+
+    // THEN
+    expect(stack).to(haveResource('AWS::ApiGateway::BasePathMapping', {
+      'DomainName': {
+        'Ref': 'restApiWithStageCustomDomainC4749625',
+      },
+      'RestApiId': {
+        'Ref': 'restApiWithStageD4F931D0',
+      },
+      'Stage': {
+        'Ref': 'restApiWithStageDeploymentStageprodC82A6648',
+      },
+    }));
+
+    test.done();
+  },
+
+  'base path mapping configures stage for SpecRestApi creation'(test: Test) {
+    // GIVEN
+    const stack = new Stack();
+
+    const definition = {
+      key1: 'val1',
+    };
+
+    new apigw.SpecRestApi(stack, 'specRestApiWithStage', {
+      apiDefinition: apigw.ApiDefinition.fromInline(definition),
+      domainName: {
+        domainName: 'example.com',
+        certificate: acm.Certificate.fromCertificateArn(stack, 'cert', 'arn:aws:acm:us-east-1:1111111:certificate/11-3336f1-44483d-adc7-9cd375c5169d'),
+        endpointType: apigw.EndpointType.REGIONAL,
+      },
+    }).root.addMethod('GET');
+
+    // THEN
+    expect(stack).to(haveResource('AWS::ApiGateway::BasePathMapping', {
+      'DomainName': {
+        'Ref': 'specRestApiWithStageCustomDomain8A36A5C9',
+      },
+      'RestApiId': {
+        'Ref': 'specRestApiWithStageC1492575',
+      },
+      'Stage': {
+        'Ref': 'specRestApiWithStageDeploymentStageprod2D3037ED',
+      },
+    }));
+
+    test.done();
+  },
 };