Graphql plugin duplication

[leon1995]

Bug report

Required System information

• Node.js version: v18.12.1
• NPM version: 8.19.2
• Strapi version: 4.5.3
• Database: sqlite
• Operating system: macos

Describe the bug

Strapi is not able to run with plugin-graphql plugin. I followed the quick-start guide and the graphql documentation to install the plugin, but the server is not starting anymore.

Steps to reproduce the behavior

1. Create a new strapi app npx create-strapi-app@latest strapi-test
2. cd strapi-test
3. install graphql plugin npm install @strapi/plugin-graphql
   This results in

[2022-12-07 08:49:57.531] debug: ⛔️ Server wasn't able to start properly.
[2022-12-07 08:49:57.533] error: Cannot use GraphQLScalarType "Time" 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.
Error: Cannot use GraphQLScalarType "Time" 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.

[nitoba]

This happen because there are two different versions of graphql installed inside node_modules.
To solve this problem you need override the graphql version.
Add this in your package.json

"overrides": {
  "@strapi/plugin-graphql": {
  "graphql": "15.8.0"
  }
}

Version 15.8.0 is the version before the latest

[alexissel]

I am having the same problem with Strapi v4.16.0

[BorisKamp]

How is this closed!? It's still happening

[NikitaPanteleev]

I solved this issue the following way.

1. run npm list graphql to see duplicated versions, in my case, all except for one version are 16.8.1:

2. add the following lines in package.json:

"overrides": {
    "graphql": "16.8.1" 
  },

[BorisKamp]

I solved this issue the following way.

1. run npm list graphql to see duplicated versions, in my case, all except for one version are 16.8.1:

2. add the following lines in package.json:

"overrides": {
    "graphql": "16.8.1" 
  },

Thank you! This fixed it. I had the 15.8.0 version on graphql-upload as well. Who's 'fault' is this that it's not synced across all with the same 16.8.1 version?

[strapi-bot]

This issue has been mentioned on Strapi Community Forum. There might be relevant details there:

https://forum.strapi.io/t/unable-to-start-strapi-after-installing-graphql/34772/2