Schema stitching results in query directives to be omitted

[artema]

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• 1. The issue provides a reproduction available on Github, Stackblitz or CodeSandbox

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  Please make sure the GraphQL Tools package versions under package.json matches yours.

• 2. A failing test has been provided
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---

Describe the bug

Using stitchSchemas({ mergeDirectives: true }) results in directives on queries to be omitted from the operation definition. Directives from other places (e.g. fields in the query) are preserved.

Schema:

directive @test on QUERY | FIELD

type Query {
  hello: String
}

Request:

query Hello @test { # this is lost
   hello @test # this is preserved
}

Parsed query:

query Hello {
  __typename
  hello @test
}

To Reproduce Steps to reproduce the behavior:

https://codesandbox.io/p/devbox/graphql-schema-stitching-kx4lvh

Expected behavior

All directives are present in OperationDefinitionNode in resolvers.

Environment:

• OS: OSX
• @graphql-tools/stitch: 10.1.1
• NodeJS: 22

[coderabbitai]

A summary of the changes CodeRabbit can apply:

• Update packages/utils/src/build-operation-for-field.ts to import DirectiveNode, add an optional directives parameter to buildOperationNodeForField and its internal helper, include the directives property on the returned OperationDefinitionNode (with JSDoc), and add a new test suite packages/utils/tests/build-operation-with-directives.spec.ts to verify preservation of operation-level directives (single, with args, multiple, backward compatibility, and valid GraphQL).

• Add support for attaching directives to generated operation definitions by updating packages/utils/src/build-operation-for-field.ts (import DirectiveNode, add an optional directives?: readonly DirectiveNode[] parameter, thread it through to the helper/state and include it on the OperationDefinitionNode), and add tests in packages/utils/tests/build-operation-with-directives.spec.ts verifying preservation of single/multiple directives, directives with arguments, backward compatibility when omitted, and correct printed GraphQL output.

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