feat(appsync): support union types for code-first approach

[BryanPan342]

Support Union Types for code-first approach. Union Types are special types of Intermediate Types in CDK.

Desired GraphQL Union Type

union Search = Human | Droid | Starship

The above GraphQL Union Type can be expressed in CDK as the following:

CDK Code

const human = new appsync.ObjectType('Human', { definition: {} });
const droid = new appsync.ObjectType('Droid', { definition: {} });
const starship = new appsync.ObjectType('Starship', { definition: {} });
const search = new appsync.UnionType('Search', {
  definition: [ human, droid, starship ],
}); 
api.addType(search);

---

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[shivlaks]

nice work! some minor suggestions to take a look at before we can merge this one.

[shivlaks]

why not put all of this into a beforeAll() ?

[BryanPan342]

is there a difference between giving it global scope and using beforeAll()?

[BryanPan342]

https://stackoverflow.com/questions/47913168/in-jest-are-defining-global-variables-the-same-as-if-they-are-defined-in-before

since i dont have any asynchronous code before the testing I think it's okay to put it in global scope. wdyt?

[mergify]

Thank you for contributing! Your pull request will be updated from master and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildProject6AEA49D1-qxepHUsryhcu
• Commit ID: 296fabf
• Result: SUCCEEDED
• Build Logs (available for 30 days)

Powered by github-codebuild-logs, available on the AWS Serverless Application Repository

[mergify]

Thank you for contributing! Your pull request will be updated from master and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).