How to use code generator with custom AWS AppSync scalars?

[xzilja]

I am creating my graphql schema for AWS AppSync. They expose some custom scalars as per https://docs.aws.amazon.com/appsync/latest/devguide/scalars.html#appsync-defined-scalars

I tried adding these in my codegen.yml as follows

schema: ../server/src/schema.graphql
generates:
  ./typings/api.ts:
    plugins:
      - typescript
    config:
      scalars:
        AWSDateTime: Date

However am still getting following error

$ graphql-codegen
  ✔ Parse configuration
  ❯ Generate outputs
    ❯ Generate ./typings/api.ts
      ✖ Load GraphQL schemas
        → Failed to load schema
        Load GraphQL documents
        Generate


 Found 1 error

  ✖ ./typings/api.ts
    Failed to load schema from ../server/src/schema.graphql:

        Unknown type: "AWSDateTime".
        Error: Unknown type: "AWSDateTime".

Am I missing something here? Also, while on the topic, I can see that there are many places where config/scalars can be defined i.e in various plugins. Is it possible to define it globally somehow?

[dotansimha]

#4311