Generated TypeScript code contains references to an undefined name '_Service'?

[Yurii Chyrkov]

package.json

  "dependencies": {
    "fastify": "^4.3.0",
    "mercurius": "^10.1.0",
    "mercurius-codegen": "^4.0.1",
  }

Steps to reproduce:

• Clone https://github.com/api-haus/mercurius-codegen-bug
• Run npm install && npm run codegen to generate code

TypeScript errors in generated code:

src/generated.ts:148:33 - error TS2304: Cannot find name '_Service'.

148   _Service: ResolverTypeWrapper<_Service>;
                                    ~~~~~~~~

---

This issue is persistent for many months. I wonder why this is happening. Previously we had a working version and just removed broken code from file so the typings would work correctly.

[Yurii Chyrkov]

As a workaround I can create a global definition for _Service.

export {};

declare global {
  type _Service = any;
}

[Jedaan]

as a workaround, you can define new scalar

scalar _Service