GraphQL error: Schema must be an instance of GraphQLSchema

[Ayc0]

When I run react-apollo with a mockNetworkInterface (last versions of react-apollo and apollo-test-utils, an error is constantly poping :

GraphQL error: Schema must be an instance of GraphQLSchema.
Also ensure that there are not multiple versions of GraphQL installed
in your node_modules directory.

[mairh]

@Ayc0 Are you using graphql-server-express? If yes then you need to upgrade it to 0.8.0. I don't think it is coming directly from react-apollo.

P.S -> Assuming you are running latest version of graphql

[Ayc0]

I am not connected to a server: I mock the data as the tuto says.

But I'm sure that It comes either from react-apollo or from apollo-test-utils: when I git clone, it works but with old packages and when I upgrade every packages, it crashes on both of them (this error with react-apollo)

[stubailo]

Can you post a reproduction with some code? We can't tell where that is coming without being able to see what you are doing.

[helfer]

@Ayc0 what's the output of npm list | grep graphql?

[Ayc0]

https://github.com/Ayc0/apollo

In the folder client, there is a version of the code which is working with old packages.
In the folder client2, there is exactly the same code but with the newest packages.

[Ayc0]

Last updates of apollo fix my problem
Thanks apollo team <3

[erlangxk]

install the same version of graphql as the one in react-apollo devDependencies list, for example, for react-apollo 1.4.15, just yarn add graphql@0.10.5.

[therealedsheenan]

this is just a version compatibility error between react-apollo ang graphql.

[fxlemire]

@stubailo Here's a reproduction: https://github.com/fxlemire/graphql-react-tutorial/tree/part-1 (notice the branch part-1)

It's basically the entire part 1 of this tutorial

I've also tried with graphql@^0.10.5, to no avail.

Any help on how to fix this would be much appreciated!

EDIT: Now working thanks to @linhdsv yarn add graphql@0.10.5 👍

[siltwood]

This tutorial doesn't work anymore but it helps me understand how Apollo sets up a Higher Order Component.

[linhdsv]

I tried yarn add graphql@0.10.5 and restarted the app, everything worked well to me.

[fxlemire]

Thanks @linhdsv ! Indeed the ^ in yarn add graphql@^0.10.5 was the culprit.

[zhoukekestar]

Thanks @linhdsv . Try npm list | grep graphql to see all versions of graphql on your location. See https://github.com/apollographql/apollo-test-utils/issues/35

$ npm list | grep graphql
client@0.1.0 /Users/xxx/workspace/GitHub/graphql-tutorial/client
│ ├── graphql@0.10.5
│ ├── graphql-tag@2.5.0
│ └─┬ graphql-tools@1.2.3
│   └── @types/graphql@0.9.4
├─┬ graphql@0.11.7
├─┬ graphql-tools@2.5.1
│ │ ├── @types/graphql@0.10.2
│ │ │ ├── graphql@0.10.5
│ │ ├── graphql@0.10.5
│ │ ├── graphql-anywhere@3.1.0

There are two version of graphql: 0.11.7 & 0.10.5.

So I try to update my npm by sudo npm install -g npm. ( My previous npm version is 3.x)
And reinstall graphql by npm install graphql@0.10.5.

It works for me.

[maximeg]

For those arriving after the battle, I solved things by adding this into my packages.json:

  "resolutions": {
    "graphql": "^0.11.0"
  },

This will instruct Yarn not to nest graphqland keep only one version (like the flat mode).

[pricetula]

I have tried all above but still encountering below error

Error: Schema must be an instance of GraphQLSchema. Also ensure that there are not multiple versions of GraphQL installed in your node_modules directory.
    at t.default (/Project/react-coolcat/dist/bundle.server.js:1:13926)
    at Object.t.validate (/Project/react-coolcat/dist/bundle.server.js:1:270198)
    at /Project/react-coolcat/dist/bundle.server.js:1:268684
    at /Project/react-coolcat/dist/bundle.server.js:1:269337
    at process._tickCallback (internal/process/next_tick.js:109:7)

I checked graphql packages

npm list | grep graphql     
│ └── graphql-anywhere@4.0.2
│ │ └─┬ graphql-extensions@0.0.5
│ ├── graphql@0.10.5
│ └─┬ graphql-tools@1.2.3
│   └── @types/graphql@0.9.4
├─┬ graphql@0.11.7
├── graphql-tag@2.5.0
├─┬ graphql-tools@2.11.0
npm ERR! peer dep missing: apollo-client@^1.0.0, required by apollo-test-utils@0.3.2

Packages installed

"dependencies": {
    "apollo-cache-inmemory": "^1.1.2",
    "apollo-client": "^2.1.0",
    "apollo-link-error": "^1.0.2",
    "apollo-link-http": "^1.3.0",
    "apollo-server-express": "^1.2.0",
    "apollo-test-utils": "^0.3.2",
    "babel-polyfill": "^6.26.0",
    "babel-runtime": "^6.26.0",
    "body-parser": "^1.18.2",
    "express": "^4.16.2",
    "graphql": "^0.11.7",
    "graphql-tag": "^2.5.0",
    "graphql-tools": "^2.11.0",
    "react": "^16.1.1",
    "react-dom": "^16.1.1",
    ...
  },

[zhoukekestar]

@pricetula You have two versions of GraphQL include 0.10.5 & 0.11.7. You should npm install graphql@0.10.5 --save to solve this issue.

[pricetula]

Hi @zhoukekestar thanks i got it resolved nothing to do with multiple graphql copies. I also did install graphql@0.10.5 but kept on getting Error: Schema must be an instance of GraphQLSchema. Also ensure that there are not multiple versions of GraphQL installed in your node_modules directory. error.

Turns out I was using typeDefs incorrectly without making it executable using makeExecutableSchema({ typeDefs }) on graphqlExpress()

[jiku]

Can also happen trying to import a makeExecutableSchema(...) exported in a different package.