fix: REQUIRED_INACCESSIBLE with default values

[n1ru4l]

Fix REQUIRED_INACCESSIBLE composition rule reporting a composition error if @inaccessible is applied on a non-nullable field with a default value.

In the following example schema the Query.ping(message:) argument no longer raises REQUIRED_INACCESSIBLE, as a default value for the argument is provided. The same behaviour applies for input type fields.

extend schema
  @link(
    url: "https://specs.apollo.dev/federation/v2.9"
    import: ["@inaccessible"]
  )

  type Query {
    ping(message: String! = "pong" @inaccessible): String!
  }

[gemini-code-assist]

Code Review

This pull request adds new test cases to REQUIRED_INACCESSIBLE.spec.ts to verify that the @inaccessible directive is permitted on required arguments and input fields when a default value is provided. The reviewer noted that these tests currently fail and will break the CI pipeline. To address this, it is recommended to either update the RequiredArgumentOrFieldIsNotInaccessibleRule validation logic to check for default values or mark the tests with test.todo() or test.fails() to keep the CI green.

[github-actions]

🚀 Snapshot Release (alpha)

The latest changes of this PR are available as alpha on npm (based on the declared changesets):

Package	Version	Info
@theguild/federation-composition	0.22.3-alpha-20260420112644-a174fe2b2b471cb99c3bb99818ca0844b7bf3f0d	npm ↗︎ unpkg ↗︎

[dotansimha]

LGTM. But let's wait for @kamilkisiela 's review as well, as he might have broader context than me on this one :)