Version 2.4.2 is a maintenance release with language improvements and fixes, better SQL cache debug, Websocket management and more.

SDL type extensions

Type extensions are now supported in SDL schemas. SDL schema can now include extension like below:

extend type Starship {
  shieldLevel: Float!
}

Variable default values

Apollo Android now supports default values for variables (#2704)

query GetHero(
  $myBool: Boolean = true,
  $unit: LengthUnit! = FOOT,
  $listOfInts: [Int] = [1, 2, 3]
) {
  ...
}

will generate:

data class GetHero(
  val myBool: Input<Boolean> = Input.optional(true),
  val unit: LengthUnit = LengthUnit.safeValueOf("FOOT"),
  val listOfInts: Input<List<Int?>> = Input.optional(listOf(1, 2, 3))
) 

This only works for scalar types and their list/nonnull declinations. Full support for input object will be added later. Follow #2572 for updates

Better subscription Websocket management

SubscriptionManger.reconnect is now exposed as public API. It can be called to reconnect a WebSocket if credentials/token needs to be refreshed.

Full Changelog

✨ New

[Subscriptions] expose SubscriptionManager.reconnect() (#2706)
[Compiler] Add support for default variable values (#2704)
[SQL cache] implement SqlNormalizedCache.dump (#2709)
[SDL] add support for type extensions (#2666)
[Multi-modules] Add packageName option to override fragments package name (#2669)

👷‍ Fixes

[Compiler] fix @deprecated(reason:"") directive (#2720)
[Compiler] fix @deprecated directive without any deprecation reason (#2692)
[Gradle plugin] fix downloadApolloSchema variants detection (#2712)
[Compiler] support multiple arguments in directives (#2711)
[Compiler] Fix merging fields would forget inline fragments in some cases (#2689)
[Multiplatform] set the correct Content-Type on iOS (#2691)
[SDL] allow to have schemas without mutations/subscriptions (#2684)
[Gradle Plugin] Make CheckDuplicate task cacheable (#2688)
[Java codegen] Do not try to annotate primitive types in List type parameters (#2663)
[Compiler] Fix Missing Referenced Fragments in Root query type (#2647)
[Publishing] fix the license url and a few other dangling urls after the master -> (#2639)

📖 Documentation

[Documentation] use the correct "image/jpeg" mimetype. (#2699)

❤️ External contributors

Many thanks to:

• @tylerbwong for diving deep into root query types fragments and inline fragments
• @olivierg13 for making the Gradle build cache always better
• @Laimiux for making multi-module package names more sensible
• @renclav, @MadJonTurck, @DSteve595, @benoitletondor and @NitroG42 for all the detailed feedback and investigations, this helps a ton !