Apollo Federation - Duplicate scalar in multiple services

• I run into an error when using a scalar like DateTime in two different microservices, and merging them together with Apollo Federation. Here is a snippet of the error being thrown UnhandledPromiseRejectionWarning: GraphQLSchemaValidationError: There can be only one type named "DateTime".

• Apollo Federation

• UnhandledPromiseRejectionWarning: GraphQLSchemaValidationError: There can be only one type named "DateTime"..

Microservice Foo

export const typeDefsFoo: DocumentNode = gql`
  scalar DateTime
  
  extend type Query {
    foo(id: ID!): Sensor!
  }

  type Foo {
    time: DateTime!
  }

Microservice Bar

export const typeDefsBar: DocumentNode = gql`
  scalar DateTime
  
  extend type Query {
    bar(id: ID!): Bar!
  }

  type Bar {
    time: DateTime!
  }
`;

[JakeDawkins]

@byrnedo This should be available now in @apollo/federation@0.6.4. @apollo/gateway@0.6.7 should be published in the next couple hours with this

[JakeDawkins]

@Pruxis I’m not aware of a workaround, but I hope to be wrapping up work on this today, so this should work soon. Sorry for the trouble. If anyone else here has a workaround, feel free to share!