directive @core(feature: String!) repeatable on SCHEMA

directive @join__owner(graph: join__Graph!) on OBJECT

directive @join__type(
    graph: join__Graph!
    key: String!
    resolvable: Boolean = true
) repeatable on OBJECT | INTERFACE

directive @join__field(
    graph: join__Graph
    requires: String
    provides: String
) on FIELD_DEFINITION

directive @join__graph(name: String!, url: String!) on ENUM_VALUE

enum join__Graph {
    PRODUCT @join__graph(name: "product", url: "http://example.com/product")
    USER @join__graph(name: "user", url: "http://example.com/user")
}

type Product implements Node {
    description: String @join__field(graph: PRODUCT)
    id: ID! @join__field(graph: PRODUCT)
    name: String! @join__field(graph: PRODUCT)
    price: Float! @join__field(graph: PRODUCT)
}

type User implements Timestamped {
    createdAt: String! @join__field(graph: USER)
    email: String! @join__field(graph: USER)
    id: ID! @join__field(graph: USER)
    updatedAt: String! @join__field(graph: USER)
    username: String! @join__field(graph: USER)
}

type Query {
    user(id: ID!): User @join__field(graph: USER)
}

interface Node {
    id: ID!
}

interface Timestamped implements Node {
    createdAt: String!
    id: ID!
    updatedAt: String!
}