I am working on the image resize one, but even the appsync functions are using this type - https://github.com/serverless-stack/serverless-stack/blob/master/examples/graphql-appsync/api/functions/lambda.ts

Hmm definitely shouldn’t be

APIGatewayProxyHandlerV2

. Will update!

by chance, what should it be for an s3 event

I think it should be

S3Handler

https://github.com/DefinitelyTyped/DefinitelyTyped/blob/b1531302ae0883690b6424400d7b9e9295c6277f/types/aws-lambda/trigger/s3.d.ts