Correctly dealing with InputObject without any fields

[Bertg]

Describe the bug

Possible invalid schema generation

Versions

graphql version: 2.0.5
rails (or other framework): Rails-7.0.3
other applicable versions: graphql-batch (0.5.1)

GraphQL schema

See above

GraphQL query

See below

Steps to reproduce

Given I define an Input Object without any fields
When I generate the schema, I get the following result:

input SomeInputType {
}

When I try to read this with @graphql-tools/load I get an error.

However If I modify the output to

input SomeInputType

reading with @graphql-tools/load works fine.

• According to the spec (https://spec.graphql.org/June2018/#sec-Input-Objects) it seems that input field should be optional, but the validation steps say at leas on field is required.
• According to a thread on Stack Overflow an empty list notation { } is indeed invalid, but the list itself is optional.

Expected behavior

I'm not sure what is correct here, but I'm assuming the GraphQL lib should not render empty lists { }. Both for InputObject and Objects. If not, maybe there should be runtime warnings for having InputObject/Objects without any field defined.

Actual behavior

See above

Additional context

No other context

[rmosolgo]

Thanks for the detailed report! I've worked up a fix and I'll release it soon.