I have below graphql schema defined in a apollo server works as a subgraph behind Apollo federation router.
extend schema @link(url: "https://specs.apollo.dev/federation/v2.0", import: ["@key", "@shareable"])
scalar DateTime @shareable
type _Service {
sdl: String
}
# This "Book" type defines the queryable fields for every book in our data source.
type Book {
title: String
author: String
date: DateTime
}
It has a custom scalar type DateTime. I marked it as @sharable in order to make this type visible in other subgraph. But when I try to launch this Apollo server I got below error:
GraphQLError: Directive "@shareable" may not be used on SCALAR.
It says @shareable is not shareable. How can I make a custom type available in other sub-graphs?
