Appsync Repo

If you already have an AppSync API built in the AWS Console, follow these steps:

AWS is continuously evolving AppSync. The shift from VTL to JavaScript resolvers is a game-changer, making AppSync repos more developer-friendly. Future trends include: appsync repo

Your AppSync repo should evolve with these changes. Keep your IaC tooling up to date, and regularly refactor outdated VTL resolvers to JavaScript. If you already have an AppSync API built

interface PostRepository 
  getPost(id: string): Promise<Post>;
  listPosts(filter: PostFilter): Promise<Post[]>;
  savePost(post: PostInput): Promise<Post>;
  subscribeToNewPosts(): Observable<Post>;

AppSync implementation uses API.graphql under the hood. Your AppSync repo should evolve with these changes

Example (JS resolver – DynamoDB repository)

// getItem repository function
import  dynamodb  from '@aws-appsync/utils';
export function request(ctx) 
  return dynamodb.get( key:  id: ctx.args.id  );
export function response(ctx)  return ctx.result;