Uncaught TypeError, Cannot read property '0' of undefined

[bigblind]

Here's the complete stack trace:

Uncaught TypeError: Cannot read property '0' of undefined
    at getDiagnostics (getDiagnostics.js?6960:46)
    at eval (lint.js?eb0c:43)
    at startLinting (lint.js?af2c:147)
    at Object.eval [as lint] (lint.js?af2c:241)
    at new CodeMirror$1 (codemirror.js?f14e:7645)
    at CodeMirror$1 (codemirror.js?f14e:7590)
    at QueryEditor.componentDidMount (QueryEditor.js?39d7:115)
    at eval (ReactCompositeComponent.js?063f:264)
    at measureLifeCyclePerf (ReactCompositeComponent.js?063f:75)
    at eval (ReactCompositeComponent.js?063f:263)

My code is basically the same as the example in this project's README, providing only a fetcher.

[wincent]

My code is basically the same

Can you show a paste and repro instructions (ie. when does the error appear and what actions did you take before/after)?

[aeiz]

I'm having this issue when I use graphiql 0.11.11 with the latest graphql (0.13.1) installed. The moment I uninstall graphql, the graphiql component works as expected.

It works correctly if I install graphql@0.10.1 which is the specific version in graphiql 0.11.11's package.json. Not sure exactly what version of graphql breaks graphiql.

[JustinPlute]

^ to add onto what @aeiz wrote, I had this same exact error with the most recent graphiql (v0.11.11) and graphql (v0.13.2) packages installed. graphiql and its codemirror-graphql dependency only support graphql (v0.12.2 or under) as defined under peerDependencies in the package.json files. The solution was to downgrade graphql to v0.12.3. This will be an issue if anyone does npm i graphql blindly without specifying a version. In short, graphql v.0.13+ is not supported for graphiql v0.11.11.

[thomasheyenbrock]

Hey @bigblind 👋 can this bug still be reproduced with the latest GraphiQL version (currently 1.8.10)?