serializing graphql input differently with `additionalResolvers` & `additionalTypeDefs`

[mdugue]

Issue workflow progress

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

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• 2. A failing test has been provided
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Describe the bug

Nested graphql input get serialized differently when (empty) additionalResolvers & additionalTypeDefs are specified.

Apparently input gets extracted and added to the variables section. While this might be spec compliant it looks strange that this behavior is triggered just by the existance of eg additionalTypeDefs and creates issues eg. when used with EdgeDB.

To Reproduce

1. run a query that leads to a graphql service behind mesh with nested input, such as
   query:

query MyQuery2 {
  BaseObject(filter: {id: {eq: "09445c10-6b73-11ed-b68a-8f3ad0a07170"}}) {
    id
  }
}

2. without additionalResolvers & additionalTypeDefs the serialized POST request body seems straight forward & correct:

'{"query":"query MyQuery2 {\\n  BaseObject(filter: {id: {eq: \\"09445c10-6b73-11ed-b68a-8f3ad0a07170\\"}}) {\\n    id\\n  }\\n}","operationName":"MyQuery2","extensions":{"headers":{},"endpoint":"http://localhost:10703/db/edgedb/graphql"}}'

3. with additionalResolvers & additionalTypeDefs the serialized POST request body is different

'{"query":"query MyQuery2($_v0_filter: FilterBaseObject) {\\n  __typename\\n  BaseObject(filter: $_v0_filter) {\\n    id\\n    __typename\\n  }\\n}","variables":{"_v0_filter":{"id":{"eq":"09445c10-6b73-11ed-b68a-8f3ad0a07170"}}},"operationName":"MyQuery2","extensions":{"headers":{},"endpoint":"http://localhost:10703/db/edgedb/graphql"}}'

Expected behavior

I would expect the results to look the same

Environment:

• OS: MacOS 13
• "@graphql-mesh/cli": "^0.79.6",
• "@graphql-mesh/graphql": "^0.32.0",
• NodeJS: 18