Describe the bug

When we create mergedAPI using GraphqlApi class and provide the firstApi as sourceApi , and use fromSourceApis method to provide definition of merged API then cloudformation deployment fails with the error:

Resource handler returned message: "Failed to merge source API: to Merged API: with the following error: There's no types found in this API

Expected Behavior

CDK should implicitly add dependency in the template such that AWS::AppSync::SourceApiAssociation for merged api is created after AWS::AppSync::GraphQLSchema of sourceapi.

Current Behavior

Currently , in the generated template , the resource AWS::AppSync::SourceApiAssociation does not wait for the creation of AWS::AppSync::GraphQLSchema for the sourceApi which leads to this error.

Reproduction Steps

const authorizationLambdaFunction = new lambda.Function(this, 'AuthFunction', {
  code: lambda.Code.fromAsset('lambda'),
  runtime: lambda.Runtime.NODEJS_18_X,
  handler: 'hello.handler',
})

// first source API
const firstApi = new appsync.GraphqlApi(this, 'ProductsAPI', {
  name: 'ProductsAPI',
  definition: appsync.Definition.fromFile(path.join(__dirname,'appsync.merged-api-1.graphql')),
  authorizationConfig: {
    defaultAuthorization: {
      authorizationType: appsync.AuthorizationType.LAMBDA,
      lambdaAuthorizerConfig: {
        handler: authorizationLambdaFunction
      }
    }
  },
  logConfig: {
    fieldLogLevel: appsync.FieldLogLevel.ALL,
    excludeVerboseContent: false
  }
});

// Merged API
const mergedApi = new appsync.GraphqlApi(this, 'MergedAPI', {
  name: 'MergedAPI',
  definition: appsync.Definition.fromSourceApis({
    sourceApis: [
      {
        sourceApi: firstApi,
        mergeType: appsync.MergeType.AUTO_MERGE,
      },
    ],
  }),
  authorizationConfig: {
    defaultAuthorization: {
      authorizationType: appsync.AuthorizationType.LAMBDA,
      lambdaAuthorizerConfig: {
        handler: authorizationLambdaFunction
      }
    }
  }
});

Possible Solution

Add depends on between the resources such that AWS::AppSync::SourceApiAssociation depends on AWS::AppSync::GraphQLSchema

workaround :

manually add the dependency in cdk code:
mergedApi.node.addDependency(firstApi);

Additional Information/Context

No response

CDK CLI Version

2.124.0

Framework Version

No response

Node.js Version

v20.8.1

OS

MacOs

Language

TypeScript

Language Version

No response

Other information

No response