MiddlewareError: Type generator exists in middleware but is missing in Schema.

[talentlessguy]

Bug report

• I have checked other issues to make sure this is not a duplicate.

there are a few similar issues but they were closed without any solution:

• Mono repo (lerna) MiddlewareError: Type generator exists in middleware but is missing in Schema. #970
• Types of property 'middlewares' are incompatible. #151 (comment)

Describe the bug

file:///home/v1rtl/Coding/x/api/node_modules/.pnpm/[email protected][email protected]/node_modules/graphql-middleware/dist/validation.mjs:10
      throw new MiddlewareError(`Type ${type} exists in middleware but is missing in Schema.`);
            ^

MiddlewareError: Type generator exists in middleware but is missing in Schema.
    at file:///home/v1rtl/Coding/x/api/node_modules/.pnpm/[email protected][email protected]/node_modules/graphql-middleware/dist/validation.mjs:10:13
    at Array.forEach (<anonymous>)
    at validateMiddleware (file:///home/v1rtl/Coding/x/api/node_modules/.pnpm/[email protected][email protected]/node_modules/graphql-middleware/dist/validation.mjs:8:27)
    at addMiddlewareToSchema (file:///home/v1rtl/Coding/x/api/node_modules/.pnpm/[email protected][email protected]/node_modules/graphql-middleware/dist/middleware.mjs:8:27)
    at normalisedMiddlewares.reduceRight.schema.schema (file:///home/v1rtl/Coding/x/api/node_modules/.pnpm/[email protected][email protected]/node_modules/graphql-middleware/dist/middleware.mjs:36:9)
    at Array.reduceRight (<anonymous>)
    at applyMiddlewareWithOptions (file:///home/v1rtl/Coding/x/api/node_modules/.pnpm/[email protected][email protected]/node_modules/graphql-middleware/dist/middleware.mjs:29:77)
    at applyMiddleware (file:///home/v1rtl/Coding/x/api/node_modules/.pnpm/[email protected][email protected]/node_modules/graphql-middleware/dist/middleware.mjs:51:10)
    at file:///home/v1rtl/Coding/x/api/graphql/schema.ts:23:17
    at ModuleJob.run (node:internal/modules/esm/module_job:183:25)

To Reproduce

import { makeExecutableSchema } from '@graphql-tools/schema'
import { applyMiddleware } from 'graphql-middleware'
import { shield, rule } from 'graphql-shield'
import { gql } from 'graphql-tag'

// Construct a schema, using GraphQL schema language.
let typeDefs = gql`
  type Query {
    hello: String
  }
`

const resolvers = {
  Query: {
    hello: () => 'Hello world!'
  }
}

const permissions = shield({
  Query: {
    hello: rule()(async () => {
      return false
    })
  }
})

const _schema = applyMiddleware(
  makeExecutableSchema({
    typeDefs,
    resolvers
  }),
  permissions
)

export const schema = applyMiddleware(_schema, permissions)

{
  "name": "api",
  "type": "module",
  "dependencies": {
    "@graphql-tools/schema": "^8.3.1",
    "graphql": "15.0.0",
    "graphql-middleware": "^6.1.11",
    "graphql-shield": "^7.5.0",
    "graphql-tag": "^2.12.5"
  },
  "devDependencies": {
    "@types/node": "^16.11.6",
    "tsm": "^2.1.4"
  }
}

$ tsm index.ts

Environment

• Node.js 16.11
• Linux x64
• pnpm 6.17.2

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[wangel13]

I think it's connected with maticzav/graphql-middleware#433 and you can downgrade graphql-middleware to =6.0.9 to make it work.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[XTVB]

isMiddlewareGenerator in graphql-middleware 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.