Type generator exists in middleware but is missing in Schema.

[Manubi]

Hi,

since the graphql-middleware update to 6.1.2 I get the following error:
MiddlewareError: Type generator exists in middleware but is missing in Schema.
I do use graphql-shield v 7.5.0

[Manubi]

Update: I think the error wars next.js experimental: { esmExternals: true },
At least for now it seems to work. For the latest version as well.

[todda00]

I'm running into the same error with anything above 6.0.10 Not using next.js, using webpack / babel (latest versions of both)

[PabloSzx]

Update: I think the error wars next.js experimental: { esmExternals: true },
At least for now it seems to work. For the latest version as well.

I just tested a Next.js project using esmExternals: true and graphql-middleware and everything works fine, and I executed all the tests on ESM and nothing fails

I'm running into the same error with anything above 6.0.10 Not using next.js, using webpack / babel (latest versions of both)

We need a reproduction repo / instructions to be able to debug it, I really tried to find this issue by myself, I just tested a lot of things and nothing fails

[Manubi]

Yeah sorry. I didn't dig deeper as I have things that I need to finish. If it shows up again I'll have a look as well.
Thanks for your work! 🤗

[NoisyFlowers]

I'm encountering this same problem.

I'm new to this biome, so not sure what is important info to relay, but I'm using graphql-middleware 6.1.6, graphql-shield 7.5.0, apollo-server-express 2.25.2, and neo4j-graphql-js 2.19.4.

Relevant code bits (maybe). Note that makeAugmentedSchema comes from https://github.com/neo4j-graphql/neo4j-graphql-js (not sure if that's important):

const typeDefs = fs
  .readFileSync(
    //process.env.GRAPHQL_SCHEMA || path.join(__dirname, 'schema.graphql')
    process.env.GRAPHQL_SCHEMA || './schema.graphql'
  )
  .toString('utf-8');
  
const schema = makeAugmentedSchema({
      typeDefs: typeDefs
});

const isAuthenticated = rule({ cache: 'contextual' })(async (parent, args, ctx, info) => {
  return ctx.user !== null
});

const isAdmin = rule({ cache: 'contextual' })(async (parent, args, ctx, info) => {
  return ctx.user.roles.includes('admin');
});

const permissions = shield({
    Query: {
        "*": allow,
    },  
    Mutation: {
        "*":  and(isAuthenticated, isAdmin)
  },
})

const server = new ApolloServer({
  context:
    async ({ req }) => {
        console.log("setting up context");

		//get user from token
        const token = req.headers.authorization || '';
        const user = await getUser(driver, token);
		
        // Add the user to the context
        return { 
            user,
            driver,
            driverConfig: { database: process.env.NEO4J_DATABASE || 'neo4j' },
        };
    },   
  schema: applyMiddleware(schema, permissions),
  introspection: true,
  playground: true,
})

[NoisyFlowers]

I've been trying different versions of graphql-middleware and am seeing the same as @todda00: the problem starts with 6.1.0.

[PabloSzx]

as already mentioned, @NoisyFlowers can you create a minimal reproduction repo? I already tried a lot of stuff trying to reproduce it and I couldn't

[balgamat]

"graphql-middleware": "^6.1.9",
"graphql-shield": "^7.5.0"

The same code works when ran in a standalone Apollo Server Micro, but when in Next.js (webpack, that is)...

Sadly, adding experimental: { esmExternals } to next.config.js did not help :/

However, downgrading to =6.0.9 solves it 👏

[wangel13]

Same problem, i have a repo to reproduce: https://github.com/wangel13/prisma-next-auth-graphql-starter

error - node_modules/graphql-middleware/dist/validation.mjs (10:0) @ eval
Error: Type generator exists in middleware but is missing in Schema.
null

[deadcoder0904]

Me too, same error 🙋‍♂️

However, downgrading to =6.0.9 solves it 👏

downgrading works :)

[PabloSzx]

Same problem, i have a repo to reproduce: https://github.com/wangel13/prisma-next-auth-graphql-starter

error - node_modules/graphql-middleware/dist/validation.mjs (10:0) @ eval
Error: Type generator exists in middleware but is missing in Schema.
null

Confirmed It's an issue with graphql-shield, since graphql-middleware ships an ESM version of the package and graphql-shield doesn't, it's just that graphql-middleware doesn't like duplicated versions of itself @maticzav

[martinnabhan]

Same problem here, it worked fine with

• graphql-middleware 6.1.9
• graphql-shield 7.5.0
• next 11.1.2

but after upgrading to next 12 we get the same above error.
Downgrading graphql-middleware to 6.0.9 fixed it.

[paulmikulskis]

I have this issue and the fix presented above.
OS: macOS 11.4
Node: 14.18.1
npm: 6.14.15
graphql-middleware: "^6.1.12"
graphql-shield: "^7.5.0"

changing the middleware loader to graphql-middleware: "6.0.9" fixed things

[harsh3977]

Facing same problem . Solved by downgrading middleware version 6.0.6.

[calboru]

Facing same problem . Solved by downgrading middleware version 6.0.6.
Are there any fix yet?

[brandoniumNutrien]

facing this problem tried downgrading, recently upgraded to nextjs 12

[jgwiazdowski]

still same problem,
6.0.9 solves it

[Jl14Salvador]

Reverting to version 6.0.9 and pinned it. Fixed my problem. Would love to see this fixed so I can update to the latest version.

[nuronbeck]

To downgrade graphql-middleware package to 6.0.9, do command:

With npm: npm uninstall graphql-middleware then do npm install graphql-middleware@6.0.9
With yarn: yarn remove graphql-middleware then do yarn add graphql-middleware@6.0.9

[hyusetiawan]

it seems downgrading is the only way to fix this issue right now. Can this be fixed on graphql-middleware side or is it because of interactions with libraries?

[XTVB]

isMiddlewareGenerator is incorrectly returning false for graphql-shield permissions, which causes this error to occur in the validation.

If you replace applyMiddleware(schema, permissions) with applyMiddleware(schema, permissions.generate(schema)) then it will work correctly with the latest version of graphql-middleware, without needing to downgrade.

[Janushan]

isMiddlewareGenerator is incorrectly returning false for graphql-shield permissions, which causes this error to occur in the validation.

If you replace applyMiddleware(schema, permissions) with applyMiddleware(schema, permissions.generate(schema)) then it will work correctly with the latest version of graphql-middleware, without needing to downgrade.

This worked for me!
Thanks!

[adhamsalama]

Any updates on this issue?