Problem with custom authChecker function

[juretopolak]

Hello everyone!

I started learning TypeScript a while ago so I must admit, that I only know the basics... But I came across this project and couldn't resist testing it.

So far I've managed to set up CRUD GraphQL resolvers based on the Prisma scheme. After that, I wanted to add the authChecker for handling Autorization but I can't get over the TypeScript error below.

I basically followed @MichalLytek's example, using the same custom auth checker function, but still have an error in my app:
https://github.com/MichalLytek/type-graphql/tree/master/examples/authorization

Types are really advanced here and I know this might be too advanced for a beginner, but still... I would really appreciate it if anyone could help me move forward!

npx ts-node index.ts

/Users/jure/Code2/prisma-typegraphql/node_modules/ts-node/src/index.ts:843
    return new TSError(diagnosticText, diagnosticCodes, diagnostics);
           ^
TSError: ⨯ Unable to compile TypeScript:
index.ts:25:5 - error TS2322: Type 'AuthChecker<Context, string>' is not assignable to type 'AuthChecker<any, any> | undefined'.
  Type 'ClassType<AuthCheckerInterface<Context, string>>' is not assignable to type 'AuthChecker<any, any>'.
    Type 'ClassType<AuthCheckerInterface<Context, string>>' provides no match for the signature '(resolverData: ResolverData<any>, roles: any[]): boolean | Promise<boolean>'.

25     authChecker,
       ~~~~~~~~~~~

  node_modules/type-graphql/dist/schema/build-context.d.ts:23:5
    23     authChecker?: AuthChecker<any, any>;
           ~~~~~~~~~~~
    The expected type comes from property 'authChecker' which is declared here on type 'BuildSchemaOptions'

    at createTSError (/Users/jure/Code2/prisma-typegraphql/node_modules/ts-node/src/index.ts:843:12)
    at reportTSError (/Users/jure/Code2/prisma-typegraphql/node_modules/ts-node/src/index.ts:847:19)
    at getOutput (/Users/jure/Code2/prisma-typegraphql/node_modules/ts-node/src/index.ts:1057:36)
    at Object.compile (/Users/jure/Code2/prisma-typegraphql/node_modules/ts-node/src/index.ts:1411:41)
    at Module.m._compile (/Users/jure/Code2/prisma-typegraphql/node_modules/ts-node/src/index.ts:1596:30)
    at Module._extensions..js (node:internal/modules/cjs/loader:1159:10)
    at Object.require.extensions.<computed> [as .ts] (/Users/jure/Code2/prisma-typegraphql/node_modules/ts-node/src/index.ts:1600:12)
    at Module.load (node:internal/modules/cjs/loader:981:32)
    at Function.Module._load (node:internal/modules/cjs/loader:827:12)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:77:12) {
  diagnosticCodes: [ 2322 ]
}

[juretopolak]

Oh, this is my testing project :)
https://github.com/juretopolak/prisma-typegraphql

[MichalLytek]

Why did you copy the source code? Now it's your type error, not because of typegraphql:
https://github.com/juretopolak/prisma-typegraphql/blob/main/interfaces/AuthChecker.ts

[juretopolak]

There are no stupid questions, but I suppose this one is really close! :D
I was so desperate with an error, that I blindly followed the example and did not realize this type can be imported directly from type-graphql. As I said, I'm a TS beginner. I hope slowly everything will become clear.
Anyway, thanks for pointing me to the solution.