TypeError: Cannot read property 'visitClass' of undefined

[dan-gamble]

hzoo here just adding: this is fixed the latest 2 versions (update your babel-eslint).

npm i babel-eslint will be >= 4.1.7.

Use npm install --save-dev babel-eslint@next or npm i babel-eslint@5.0.0-beta9

escope updated to babel 6

Eslint version: 1.4.1, 1.10.3
babel-eslint: 4.1.4

The error:

TypeError: Cannot read property 'visitClass' of undefined
    at monkeypatch (/usr/local/lib/node_modules/babel-eslint/index.js:201:40)
    at Object.exports.parse (/usr/local/lib/node_modules/babel-eslint/index.js:374:5)
    at parse (/usr/local/lib/node_modules/eslint/lib/eslint.js:539:27)
    at EventEmitter.module.exports.api.verify (/usr/local/lib/node_modules/eslint/lib/eslint.js:663:19)
    at processText (/usr/local/lib/node_modules/eslint/lib/cli-engine.js:220:27)
    at processFile (/usr/local/lib/node_modules/eslint/lib/cli-engine.js:257:18)
    at executeOnFile (/usr/local/lib/node_modules/eslint/lib/cli-engine.js:600:23)
    at /usr/local/lib/node_modules/eslint/lib/cli-engine.js:624:17
    at Array.forEach (native)
    at CLIEngine.executeOnFiles (/usr/local/lib/node_modules/eslint/lib/cli-engine.js:622:18)

No matter what path i give eslint (eslint *.js, eslint androgenix/assets/js/**/*.js) i get this error. Not sure where to start looking to fix this. Our old projects seem to work okay but we just started this one and are receiving this error.

[Havunen]

same issue.

[chromakode]

This appears to be an incompatibility with the recently released escope 3.4.0. Downgrading to 3.3.0 resolved this issue for me.

[riffraff]

we are also seeing this as of a couple hours ago, with cli eslint jsdir -f html -o eslint/eslint.html

[dan-gamble]

@chromakode How do you go about downgrading a packages escope package?

[Havunen]

npm install --save-dev escope@3.3.0 fixes issue

[dan-gamble]

@Havunen I'm still getting the same issue when trying that, tried installing locally and globally (I run eslint off of -g)

[Havunen]

but thats definitely a work around as my project has no direct dependency to escope

@dan-gamble strange, I just did what @chromakode suggested and it worked for me.

[chromakode]

@dan-gamble You may still have a copy of escope 3.4.0 under node_modules/eslint/node_modules/escope that is being used. Check npm ls | grep escope to list your installed versions, and rm -r any if necessary.

[mathew-kurian]

+1

[stevesims]

+1

[indeyets]

Upstream issue: estools/escope#99

[mattdell]

+1 to @Havunen

Edit, actually that didn't help after I cleared node_modules and ran again. I've had to disable eslint in my project as a result.

[felipenehmi]

+1

[brenopolanski]

+1

[rafaferreira]

+1

[jwilander]

+1

[lprajus2007]

Guys you can use my fork of @christophehurpeau's fix to install babel-eslint for now (if you're in need of a urgent fix just like me)

npm install git://github.com/lprajus2007/babel-eslint

[developit]

@lprajus2007 tip: npm install lprajus2007/babel-eslint

[cchamberlain]

@dan-gamble - Late to the game but I noticed your question on how to change a global packages dependency. The one-liner is npm explore eslint -g -- npm i escope@3.3.0 in case you need to do that again. Sort of documented here => https://github.com/nodejs/node-gyp/wiki/Updating-npm's-bundled-node-gyp