"Cannot read property 'type' of undefined" after upgrading to 4.14.0
See original GitHub issueGot the error after upgrading to 4.14.0 on Flow type definitions
TypeError: Cannot read property 'type' of undefined
TypeError: Cannot read property 'type' of undefined
at isForInRef (..\node_modules\eslint\lib\rules\no-unused-vars.js:410:24)
at variable.references.some.ref (..\node_modules\eslint\lib\rules\no-unused-vars.js:447:21)
at Array.some (<anonymous>)
at isUsedVariable (..\node_modules\eslint\lib\rules\no-unused-vars.js:446:40)
at collectUnusedVariables (..\node_modules\eslint\lib\rules\no-unused-vars.js:569:26)
at collectUnusedVariables (..\node_modules\eslint\lib\rules\no-unused-vars.js:576:17)
at Program:exit (..\node_modules\eslint\lib\rules\no-unused-vars.js:621:36)
at listeners.(anonymous function).forEach.listener (..\node_modules\eslint\lib\util\safe-emitter.js:47:58)
at Array.forEach (<anonymous>)
at Object.emit (..\node_modules\eslint\lib\util\safe-emitter.js:47:38)
at NodeEventGenerator.applySelector (..\node_modules\eslint\lib\util\node-event-generator.js:251:26)
at NodeEventGenerator.applySelectors (..\node_modules\eslint\lib\util\node-event-generator.js:280:22)
at NodeEventGenerator.leaveNode (..\node_modules\eslint\lib\util\node-event-generator.js:303:14)
at CodePathAnalyzer.leaveNode (..\node_modules\eslint\lib\code-path-analysis\code-path-analyzer.js:630:23)
at CodePathAnalyzer.overrideLeaveNode (..\node_modules\eslint-plugin-node\lib\rules\process-exit-as-throw.js:127:27)
at Traverser.leave [as _leave] (..\node_modules\eslint\lib\linter.js:1000:32)
Process finished with exit code -1
Issue Analytics
- State:
- Created 6 years ago
- Reactions:43
- Comments:14 (6 by maintainers)
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I apology for the inconvenience. We have found a bug in
babel-eslint
’s new logic that I added. It does not work correctly if it falls back to monkeypatching once (If you are using a plugin which parses some files (e.g. imported files) withbabel-eslint
, it can fall back).We have published
babel-eslint@8.1.1
to fix this. Please try it.Further reading: babel/babel-eslint#558, babel/babel-eslint#559.
Thanks It’s solved the problem!