AWS AppSync: Five Reasons You Should Consider It Over API Gateway

 https://lumigo.io/aws-serverless-ecosystem/aws-appsync-five-reasons-you-should-consider-it-over-api-gateway/

Introducing Direct Lambda Resolvers: AWS AppSync GraphQL APIs without VTL

 https://aws.amazon.com/blogs/mobile/appsync-direct-lambda/

Building Real-time Serverless APIs with PostgreSQL, CDK, TypeScript, and AWS AppSync

https://aws.amazon.com/blogs/mobile/building-real-time-serverless-apis-with-postgres-cdk-typescript-and-aws-appsync/