Failed batchDelegateToSchema call doesn't throw/expose errors

[theguacamoleking]

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 the GraphQL Tools 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

Hello!

I've encountered a number of situations where an error has been encountered while calling batchDelegateToSchema and it's exceptionally hard to find out what went wrong because the function resolves successfully and returns null.

To Reproduce

Steps to reproduce the behavior:

Run batchDelegateToSchema against a schema and specify a fieldName that isn't on the target schema.

// ...
batchDelegateToSchema({
  fieldName: "invalidFieldName",
  key,
  schema,
  validateRequest: true,
  argsFromKeys: (ids) => ({ ids }),
  context,
  info,
});

Expected behavior

• The promise returned from batchDelegateToSchema throws with an error indicating the outgoing query is invalid

Actual behavior

The promise resolves and returns null. There is seemingly no means for seeing the underlying error thrown lower in the call stack (onLocatedError doesn't throw).

Environment:

• OS: macOS
• "@graphql-tools/batch-delegate": "^9.0.2",
• "@graphql-tools/delegate": "^10.0.10",
• NodeJS: 20

Additional context

There's another error I'm encountering exclusively in live environments. Again, I don't really see a way to debug it because the function returns and onLocatedError doesn't get called.

Thanks!

[ardatan]

Could you create a reproduction on CodeSandbox or a failing test in a PR? Thanks.