Field extensions

Not being able to add directives to an existing field definition has been a growing pain point in Apollo Kotlin. This RFC solves that.

• Spec edits (closed)
• GAP-4
• graphql-js PR
• apollo-kotlin PR

See https://github.com/graphql/graphql-spec/issues/952 for the initial use case

Current status

Object type extensions may extend existing fields.

In this example, we deprecate the field id on type Query by adding a @deprecated directive:

type Query {
  id: String
}

extend type Query {
  id: String @deprecated(reason: "Use newId")
}

Open questions

• Are extensions a merge? Or just additive?