Error: Duplicate "graphql" modules

[tobkle]

After starting with today's version (there is no version tag):

yarn dev

And running a posts query in the playground, I received the following error:

Server is running on http://localhost:4000
Serving playground at http://localhost:3000/playground
Error: Cannot use GraphQLSchema "[object Object]" from another module or realm.

Ensure that there is only one instance of "graphql" in the node_modules
directory. If different versions of "graphql" are the dependencies of other
relied on modules, use "resolutions" to ensure only one version is installed.

https://yarnpkg.com/en/docs/selective-version-resolutions

Duplicate "graphql" modules cannot be used at the same time since different
versions may have different capabilities and behavior. The data from one
version used in the function from another could produce confusing and
spurious results.

Solved it by

• yarn clean cache
• npm -rf node_modules
• added in package.json the "resolutions" section
• yarn install

{
  "name": "node-advanced",
  "scripts": {
    "start": "nodemon -e js,graphql -x node -r dotenv/config src/index.js",
    "debug": "nodemon -e js,graphql -x node --inspect -r dotenv/config src/index.js",
    "playground": "graphql playground",
    "dev": "npm-run-all --parallel start playground"
  },
  "dependencies": {
    "bcryptjs": "2.4.3",
    "graphql-yoga": "1.3.2",
    "jsonwebtoken": "8.1.1",
    "prisma-binding": "1.5.12"
  },
  "devDependencies": {
    "dotenv": "5.0.0",
    "graphql-cli": "2.14.1",
    "nodemon": "1.15.0",
    "npm-run-all": "4.1.2",
    "prisma": "1.2.4"
  },
  "resolutions": {
    "graphql": "^0.13.0",
    "**/graphql": "^0.13.0"
  }
}

Or is there a better way resolving this error situation?

[marktani]

Gey @tobkle, thanks for reporting this issue!

Could you try following the steps mentioned in this comment?

Let me know if that doesn't solve the problem for you.

Thanks! 🙏

[SebaBoler]

first : yarn clean cache need be replace by yarn cache clean * Documentation Yarn
second: dont use npm -rf node_modules but rm -rf node_modules

[haysclark]

@tobkle It would be great if the "Answer" could be updated with the edits from @SebaBoler.

[AviIhej]

I followed all of these steps and still got the same result. Any idea why?

[AliIsawi]

this solution worked for me :

1. remove node_modules.
2. remove package-lock.json
3. run npm install again

that's it

[codemaster08240328]

@tobkle , I followed the step you mentioned, still have same issue.
Any idea why?
I added
"resolutions": {
"graphql": "^14.0.0",
"**/graphql": "^14.0.0"
},

[miketwo]

@codemaster08240328 If you search for graphql modules (npm ls graphql or yarn list --pattern graphql), are there duplicates with different versions? Where do they come from?

[lirenhao]

me too is 'Duplicate "graphql" modules cannot be used at the same time since different
versions may have different capabilities and behavior. The data from one
version used in the function from another could produce confusing and
spurious results.', exec 'npm ls graphql',result is 'npm ls graphql'

[marius-tafika]

yarn list graphql
example:
graphql@15.8.0
graphql@14.8.0

make all graphql to same version (see package.json)

[JoshuaAlzate]

I am encountering this error after I bundled my node application using webpack. I followed the resolution above yet the error persist.

This is my yarn list --pattern graphql

yarn list v1.22.17
├─ @apollographql/apollo-tools@0.5.2
├─ @apollographql/graphql-playground-html@1.6.29
├─ @graphql-tools/merge@8.2.3
├─ @graphql-tools/mock@8.5.2
├─ @graphql-tools/schema@8.3.2
├─ @graphql-tools/utils@8.6.2
├─ graphql-query-complexity@0.7.2
├─ graphql-subscriptions@1.2.1
├─ graphql-tag@2.12.6
├─ graphql@15.8.0
└─ type-graphql@1.1.1

[ukesh-rajasekar]

@codemaster08240328 If you search for graphql modules (npm ls graphql or yarn list --pattern graphql), are there duplicates with different versions? Where do they come from?
This is the error msg when i tried to run codegen:

Error: Cannot use GraphQLScalarType "String" from another module or realm.

Ensure that there is only one instance of "graphql" in the node_modules
directory. If different versions of "graphql" are the dependencies of other
relied on modules, use "resolutions" to ensure only one version is installed.

https://yarnpkg.com/en/docs/selective-version-resolutions

Duplicate "graphql" modules cannot be used at the same time since different
versions may have different capabilities and behavior. The data from one
version used in the function from another could produce confusing and
spurious results.

I tried @miketwo approach, worked in my case.

1. yarn list --pattern graphql
2. noticed I have multiple graphql modules
   something like this below

yarn list v1.22.17
├─ @apollographql/apollo-tools@0.5.3
├─ @apollographql/graphql-language-service-interface@2.0.2
├─ @apollographql/graphql-language-service-parser@2.0.2
├─ @apollographql/graphql-language-service-types@2.0.2
├─ @apollographql/graphql-language-service-utils@2.0.2
├─ @graphql-typed-document-node/core@3.1.1
├─ apollo-graphql@0.9.6
├─ apollo-language-server@1.26.8
│  └─ graphql@15.8.0
├─ apollo@2.33.10
│  ├─ graphql-tag@2.12.4
│  └─ graphql@15.8.0
├─ graphql-tag@2.12.6
└─ graphql@16.3.0

3. Then made sure every graphql modules belongs to the same version (in my case it is 15.8.0)