The prop value with an expression type of undefined could not be resolved.

[eTorAken]

From evcohen/eslint-plugin-jsx-a11y#178, I got an error when running eslint-plugin-jsx-a11y plugin which uses jsx-ast-utils.

Here is my configuration:

• OS: Windows 10
• Running ESLint: v3.8.1
• Launched with: gulp-eslint@3.0.1
• Stacktrace:

C:\Users\Clément\Documents\Work\phoenix\www\node_modules\jsx-ast-utils\lib\values\expressions\index.js:170
    throw new Error(errorMessage(type));
          ^
Error: The prop value with an expression type of undefined could not be resolved.
  Please file issue to get this fixed immediately.
    at extract (C:\Users\Clément\Documents\Work\phoenix\www\node_modules\jsx-ast-utils\lib\values\expressions\index.js:170:11)
    at Object.extractValueFromConditionalExpression [as ConditionalExpression] (C:\Users\Clément\Documents\Work\phoenix\www\node_modules\jsx-ast-utils\lib\values\expressions\ConditionalExpression.js:26:59)
    at Object.extract [as JSXExpressionContainer] (C:\Users\Clément\Documents\Work\phoenix\www\node_modules\jsx-ast-utils\lib\values\expressions\index.js:173:21)
    at getValue (C:\Users\Clément\Documents\Work\phoenix\www\node_modules\jsx-ast-utils\lib\values\index.js:52:27)
    at extractValue (C:\Users\Clément\Documents\Work\phoenix\www\node_modules\jsx-ast-utils\lib\getPropValue.js:24:12)
    at getPropValue (C:\Users\Clément\Documents\Work\phoenix\www\node_modules\jsx-ast-utils\lib\getPropValue.js:41:10)
    at EventEmitter.JSXOpeningElement (C:\Users\Clément\Documents\Work\phoenix\www\node_modules\eslint-plugin-jsx-a11y\lib\rules\mouse-events-have-key-events.js:35:62)
    at emitOne (events.js:95:20)
    at EventEmitter.emit (events.js:182:7)
    at NodeEventGenerator.enterNode (C:\Users\Clément\Documents\Work\phoenix\www\node_modules\eslint\lib\util\node-event-generator.js:40:22)
    at CodePathAnalyzer.enterNode (C:\Users\Clément\Documents\Work\phoenix\www\node_modules\eslint\lib\code-path-analysis\code-path-analyzer.js:608:23)
    at CommentEventGenerator.enterNode (C:\Users\Clément\Documents\Work\phoenix\www\node_modules\eslint\lib\util\comment-event-generator.js:97:23)
    at Controller.enter (C:\Users\Clément\Documents\Work\phoenix\www\node_modules\eslint\lib\eslint.js:898:36)
    at Controller.__execute (C:\Users\Clément\Documents\Work\phoenix\www\node_modules\eslint\node_modules\estraverse\estraverse.js:397:31)
    at Controller.traverse (C:\Users\Clément\Documents\Work\phoenix\www\node_modules\eslint\node_modules\estraverse\estraverse.js:501:28)
    at Controller.Traverser.controller.traverse (C:\Users\Clément\Documents\Work\phoenix\www\node_modules\eslint\lib\util\traverser.js:36:33)
    at EventEmitter.module.exports.api.verify (C:\Users\Clément\Documents\Work\phoenix\www\node_modules\eslint\lib\eslint.js:895:23)
    at processText (C:\Users\Clément\Documents\Work\phoenix\www\node_modules\eslint\lib\cli-engine.js:264:31)
    at CLIEngine.executeOnText (C:\Users\Clément\Documents\Work\phoenix\www\node_modules\eslint\lib\cli-engine.js:756:26)
    at verify (C:\Users\Clément\Documents\Work\phoenix\www\node_modules\gulp-eslint\index.js:20:25)
    at Transform._transform (C:\Users\Clément\Documents\Work\phoenix\www\node_modules\gulp-eslint\index.js:70:17)
    at Transform._read (_stream_transform.js:167:10)
    at Transform._write (_stream_transform.js:155:12)
    at doWrite (_stream_writable.js:301:12)

[eTorAken]

It seems to be a Windows related issue. I tried the same installation on a debian machine without any problem.

[billmei]

This also appears to be an issue on CodeClimate

/usr/local/node_modules/jsx-ast-utils/lib/values/expressions/index.js:170
    throw new Error(errorMessage(type));
    ^

Error: The prop value with an expression type of undefined could not be resolved.
  Please file issue to get this fixed immediately.
    at extract (/usr/local/node_modules/jsx-ast-utils/lib/values/expressions/index.js:170:11)
    at Object.extractValueFromConditionalExpression [as ConditionalExpression] (/usr/local/node_modules/jsx-ast-utils/lib/values/expressions/ConditionalExpression.js:26:59)
    at Object.extract [as JSXExpressionContainer] (/usr/local/node_modules/jsx-ast-utils/lib/values/expressions/index.js:173:21)
    at getValue (/usr/local/node_modules/jsx-ast-utils/lib/values/index.js:52:27)
    at extractValue (/usr/local/node_modules/jsx-ast-utils/lib/getPropValue.js:24:12)
    at getPropValue (/usr/local/node_modules/jsx-ast-utils/lib/getPropValue.js:41:10)
    at /usr/local/node_modules/eslint-plugin-jsx-a11y/lib/rules/no-static-element-interactions.js:72:95
    at Array.some (native)
    at EventEmitter.JSXOpeningElement (/usr/local/node_modules/eslint-plugin-jsx-a11y/lib/rules/no-static-element-interactions.js:71:52)
    at emitOne (events.js:101:20)
    at EventEmitter.emit (events.js:188:7)

We're running babel-eslint as our parser.

[jessebeach]

@eTorAken , Fixed in version v2.2.1. This will log an error in the console, but it will no longer throw.

[ljharb]

In this case, without some code to reproduce the error, there's not much we can do.