HSLdevcom / HSLdevcom/digitransit-ui
Invariant violation when using Digitransit
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- Dominant language
- JavaScript
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- 267
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- Avg merge
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Description
Using latest Digitransit master, I frequently got this error:
{ Invariant Violation: RelayPendingQueryTracker: Expected response to be an object, got `null`.
at invariant (/var/www/transports/digitransit-ui-paris/node_modules/fbjs/lib/invariant.js:42:15)
at /var/www/transports/digitransit-ui-paris/node_modules/react-relay/lib/RelayPendingQueryTracker.js:125:36
at /var/www/transports/digitransit-ui-paris/node_modules/react-relay/lib/RelayTaskQueue.js:108:25
at /var/www/transports/digitransit-ui-paris/node_modules/react-relay/lib/RelayTaskQueue.js:114:14
at RelayTaskQueue._invokeWithinScopedQueue (/var/www/transports/digitransit-ui-paris/node_modules/react-relay/lib/RelayTaskQueue.js:154:7)
at /var/www/transports/digitransit-ui-paris/node_modules/react-relay/lib/RelayTaskQueue.js:144:14
at RelayTaskQueue._scheduleIfNecessary (/var/www/transports/digitransit-ui-paris/node_modules/react-relay/lib/RelayTaskQueue.js:171:9)
at RelayTaskQueue.enqueue (/var/www/transports/digitransit-ui-paris/node_modules/react-relay/lib/RelayTaskQueue.js:120:10)
at PendingFetch._handleQuerySuccess (/var/www/transports/digitransit-ui-paris/node_modules/react-relay/lib/RelayPendingQueryTracker.js:123:68)
at tryCallOne (/var/www/transports/digitransit-ui-paris/node_modules/promise/lib/core.js:37:12) name: 'Invariant Violation', framesToPop: 1 }
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reproducing the failure against the latest Digitransit master, then inspect node_modules/react-relay/lib/RelayPendingQueryTracker.js around line 125 and the RelayTaskQueue frames in the trace. Done means identifying why the response is null and confirming that the same scenario no longer produces the invariant violation.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- javascript, react
- Domain
- frontend
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100