How to pass different auth tokens for different specs?

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I'm using this library to wrap to different APIs and combine them into a unified graphql interface using express-graphql. I have two different specs, spec1.json and spec2.json and I'm able to create a schema by passing both of these to createGraphqlSchema.

The problem is with authentication. spec1 uses OAuth and following the suggestion in #116 (comment) I have a separate express middleware that fetches the token and puts it in the request object. When calling createGraphqlSchema, I pass in the path to this using the tokenJSONPath option.

On the other hand, spec2 uses a simple static API token which also goes into the Authorization header and I set this using the headers option in createGraphqlSchema - first I check if the title matches spec2.info.title and then I override this header.

However this seems not to work since the tokenJSONPath always takes priority. Is there a way to work around this and essentially provide different authentication tokens to different specs?