Filtering all mutations breaks the schema

[aylesm]

Issue workflow progress

Progress of the issue based on the
Contributor Workflow

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

Make sure to fork this template and run yarn generate in the terminal.

Please make sure Mesh package versions under package.json matches yours.

• 2. A failing test has been provided
• 3. A local solution has been provided
• 4. A pull request is pending review

---

Describe the bug

Filtering out all mutations causes the schema to break.

eg.

transforms:
  - filterSchema:
      mode: wrap 
      filters:
        - Mutation.!{*}  

The playground shows the error message

{
  "errors": [
    {
      "message": "Type Mutation must define one or more fields."
    }
  ]
}

To Reproduce Steps to reproduce the behavior:

Expected behavior

Environment:

• OS:
• @graphql-mesh/...:
• NodeJS:

Additional context

[ardatan]

Does it work when you add https://the-guild.dev/graphql/mesh/docs/transforms/prune ?

[aylesm]

Does it work when you add https://the-guild.dev/graphql/mesh/docs/transforms/prune ?

It doesn't, was my first attempt to see if I could work round the issue.

[Marx2]

also removing all Query fail in the same way

[ardatan]

@Marx2 You cannot remove all the queries in a GraphQL Schema. A GraphQL Schema needs to have a Query type with a valid field at least.