How to add a semantic error code after resolver processing ?

[devniel]

Hello,

My goal is simple, I'm currently getting this errors together with data, it seems that they are schema validation errors:

Error: Expected a value of type "ExampleType" but received: exampleValue

And I want to add a custom code to this error (e.g. IGNORE_THIS_ERROR), something related to the Type or even the parent schema, so my client could decide if attend or not this error and consider the data results.

formatError returns the original error, but if I want to customize it in there I assume that I will need to parse the message or path looking for keywords to have an idea of the error returned and based on that assign a code. Is there a way to add metadata to these errors before, maybe in the Type or schema definition ?

Thanks

[devniel]

Related https://github.com/facebook/graphql/issues/513