atom-lupa Uncaught TypeError: Cannot read property 'on' of undefined

[Enter steps to reproduce below:]

...
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Atom Version: 1.12.2 Electron Version: 1.3.6 System: Mac OS X 10.12.1 Thrown From: atom-lupa package, v0.7.26

Stack Trace

Uncaught TypeError: Cannot read property 'on' of undefined

At /Users/me/.atom/packages/atom-lupa/node_modules/lupa/plugins/python.js:16

TypeError: Cannot read property 'on' of undefined
    at plugin (/Users/me/.atom/packages/atom-lupa/node_modules/lupa/plugins/python.js:16:15)
    at createNodeObservable (/Users/me/.atom/packages/atom-lupa/node_modules/rx/dist/rx.async.js:316:6)
    at /Users/me/.atom/packages/atom-lupa/node_modules/rx/dist/rx.async.js:357:12
    at getMappersFor (/Users/me/.atom/packages/atom-lupa/node_modules/lupa/src/getMappersFor.js:21:57)
    at file (/Users/me/.atom/packages/atom-lupa/node_modules/lupa/src/analysis.js:38:43)
    at create (/Users/me/.atom/packages/atom-lupa/node_modules/lupa/src/core/core.js:29:34)
    at Object.cache.getOrCreate (/Users/me/.atom/packages/atom-lupa/node_modules/lupa/src/core/core.js:12:54)
    at Object.process (/Users/me/.atom/packages/atom-lupa/node_modules/lupa/src/core/core.js:30:26)
    at AnonymousObserver.files.subscribe.file [as _onNext] (/Users/me/.atom/packages/atom-lupa/node_modules/lupa/src/analysis.js:69:22)
    at AnonymousObserver.Rx.AnonymousObserver.AnonymousObserver.next (/Users/me/.atom/packages/atom-lupa/node_modules/rx/dist/rx.js:1828:12)
    at AnonymousObserver.Rx.internals.AbstractObserver.AbstractObserver.onNext (/Users/me/.atom/packages/atom-lupa/node_modules/rx/dist/rx.js:1762:31)
    at Subject.onNext (/Users/me/.atom/packages/atom-lupa/node_modules/rx/dist/rx.js:5998:19)
    at filePaths.forEach.path (/Users/me/.atom/packages/atom-lupa/node_modules/lupa/src/analysis.js:115:41)
    at Array.forEach (native)
    at /Users/me/.atom/packages/atom-lupa/node_modules/lupa/src/analysis.js:115:19
    at f (/Users/me/.atom/packages/atom-lupa/node_modules/once/once.js:17:25)
    at Glob.<anonymous> (/Users/me/.atom/packages/atom-lupa/node_modules/lupa/node_modules/glob/glob.js:132:7)
    at emitOne (events.js:96:13)
    at Glob.emit (events.js:188:7)
    at Glob._finish (/Users/me/.atom/packages/atom-lupa/node_modules/lupa/node_modules/glob/glob.js:171:8)
    at done (/Users/me/.atom/packages/atom-lupa/node_modules/lupa/node_modules/glob/glob.js:158:12)
    at Glob._processGlobStar2 (/Users/me/.atom/packages/atom-lupa/node_modules/lupa/node_modules/glob/glob.js:589:12)
    at /Users/me/.atom/packages/atom-lupa/node_modules/lupa/node_modules/glob/glob.js:578:10
    at RES (/Users/me/.atom/packages/atom-lupa/node_modules/inflight/inflight.js:31:16)
    at f (/Users/me/.atom/packages/atom-lupa/node_modules/once/once.js:17:25)
    at lstatcb_ (/Users/me/.atom/packages/atom-lupa/node_modules/lupa/node_modules/glob/glob.js:487:7)
    at RES (/Users/me/.atom/packages/atom-lupa/node_modules/inflight/inflight.js:31:16)
    at f (/Users/me/.atom/packages/atom-lupa/node_modules/once/once.js:17:25)
    at FSReqWrap.oncomplete (fs.js:123:15)

Commands

     -0:19.7.0 command-palette:toggle (atom-text-editor.editor.is-focused)
     -0:15.3.0 atom-lupa:toggle (atom-text-editor.editor)

Config

{
  "core": {
    "allowPendingPaneItems": false,
    "autoHideMenuBar": true,
    "disabledPackages": [
      "tree-view-git-modified",
      "tree-view-finder",
      "tree-view-breadcrumb",
      "flow-ide",
      "grunt-runner"
    ],
    "followSymlinks": false,
    "ignoredNames": [
      ".git",
      ".hg",
      ".svn",
      ".bower-cache",
      ".bower-registry",
      "node_modules",
      "bower_components",
      ".bower-tmp",
      ".tmp",
      ".DS_Store"
    ],
    "packagesWithKeymapsDisabled": [
      "linter",
      "close-tags",
      "atom-lupa",
      "git-blame",
      "symbols-tree-view",
      "grunt-runner"
    ],
    "telemetryConsent": "limited",
    "themes": [
      "one-light-ui",
      "original-mac-classic"
    ]
  },
  "atom-lupa": {
    "shouldShowBreadcrumbs": false
  }
}

Installed Packages

# User
activate-power-mode, v1.1.0 (active)
advanced-open-file, v0.16.4 (inactive)
angularjs, v0.3.5 (active)
angularjs-snippets, v0.10.18 (active)
apathy-theme, v1.10.6 (inactive)
atom-beautify, v0.29.13 (inactive)
atom-bootstrap3, v1.2.12 (inactive)
atom-jade, v0.3.0 (active)
atom-jasmine, v0.8.1 (active)
atom-lupa, v0.7.26 (active)
atom-pair, v2.0.10 (active)
atom-ternjs, v0.16.1 (active)
atom-typescript, v10.1.12 (active)
autoclose-html, v0.23.0 (active)
autocomplete-paths, v1.0.2 (active)
blame, v0.10.0 (inactive)
clipboard-history, v0.6.6 (inactive)
clipboard-plus, v0.5.1 (active)
close-tags, v0.6.0 (inactive)
color-picker, v2.2.3 (active)
copy-filename, v1.0.1 (active)
dash, v1.7.0 (inactive)
docblockr, v0.8.7 (active)
editor-settings, v1.1.2 (active)
editorconfig, v2.0.5 (active)
emmet, v2.4.3 (active)
express-complete, v0.2.0 (active)
file-icons, v1.7.25 (active)
file-type-icons, v1.3.3 (active)
flow-ide, v1.1.9 (inactive)
fold-functions, v0.4.4 (active)
gist, v0.3.1 (inactive)
git-blame, v0.4.11 (inactive)
git-history, v3.2.0 (inactive)
git-log, v0.4.1 (active)
git-time-machine, v1.5.4 (inactive)
github-atom-light-syntax, v0.2.0 (inactive)
gitignore-snippets, v0.2.5 (inactive)
grunt-runner, v0.14.0 (inactive)
Handlebars, v1.6.0 (active)
highlight-selected, v0.11.2 (active)
inc, v0.0.4 (inactive)
javascript-snippets, v1.2.1 (active)
jscs-fixer, v1.2.1 (inactive)
language-ect, v0.4.0 (active)
language-ejs, v0.4.0 (active)
less-than-slash, v0.16.0 (active)
lines, v0.13.1 (inactive)
linter, v1.11.18 (active)
linter-jscs, v4.1.0 (active)
linter-jshint, v3.0.1 (active)
linter-less, v2.6.0 (active)
linter-markdown, v3.0.2 (active)
mac-classic, v0.4.0 (inactive)
node-debugger, v1.9.1 (active)
open-in-browser, v0.4.7 (inactive)
open-path, v0.3.6 (inactive)
original-mac-classic, v0.5.0 (active)
pigments, v0.37.0 (active)
pretty-json, v1.6.1 (active)
project-viewer, v0.3.27 (active)
react, v0.16.1 (active)
save-session, v0.16.0 (active)
sublime-default-syntax, v0.2.7 (inactive)
Sublime-Style-Column-Selection, v1.7.2 (active)
swap-selection, v0.4.0 (inactive)
symbols-tree-view, v0.13.2 (active)
sync-settings, v0.7.2 (active)
synced-sidebar, v0.4.3 (active)
tabs-closer, v0.13.0 (inactive)
todo-show, v1.8.0 (inactive)
tree-view-filter, v0.4.1 (active)
tree-view-git-status, v1.2.0 (active)
wordcount, v2.8.0 (active)
atom-dark-syntax, v0.27.0 (inactive)
atom-dark-ui, v0.52.0 (inactive)
atom-light-syntax, v0.28.0 (inactive)
atom-light-ui, v0.45.0 (inactive)
base16-tomorrow-dark-theme, v1.3.0 (inactive)
base16-tomorrow-light-theme, v1.3.0 (inactive)
one-dark-ui, v1.6.2 (inactive)
one-light-ui, v1.6.2 (active)
one-dark-syntax, v1.5.0 (inactive)
one-light-syntax, v1.5.0 (inactive)
solarized-dark-syntax, v1.0.5 (inactive)
solarized-light-syntax, v1.0.5 (inactive)
about, v1.7.0 (active)
archive-view, v0.62.0 (active)
autocomplete-atom-api, v0.10.0 (active)
autocomplete-css, v0.13.1 (active)
autocomplete-html, v0.7.2 (active)
autocomplete-plus, v2.31.4 (active)
autocomplete-snippets, v1.11.0 (active)
autoflow, v0.27.0 (inactive)
autosave, v0.23.1 (active)
background-tips, v0.26.1 (active)
bookmarks, v0.42.0 (active)
bracket-matcher, v0.82.2 (active)
command-palette, v0.39.0 (active)
deprecation-cop, v0.54.1 (active)
dev-live-reload, v0.47.0 (active)
encoding-selector, v0.22.0 (active)
exception-reporting, v0.40.0 (active)
find-and-replace, v0.202.2 (inactive)
fuzzy-finder, v1.4.0 (active)
git-diff, v1.1.0 (active)
go-to-line, v0.31.0 (inactive)
grammar-selector, v0.48.2 (active)
image-view, v0.60.0 (active)
incompatible-packages, v0.26.1 (active)
keybinding-resolver, v0.35.0 (active)
line-ending-selector, v0.5.0 (active)
link, v0.31.2 (inactive)
markdown-preview, v0.158.8 (active)
metrics, v1.1.1 (active)
notifications, v0.65.1 (active)
open-on-github, v1.2.1 (inactive)
package-generator, v1.0.1 (inactive)
settings-view, v0.243.1 (active)
snippets, v1.0.4 (active)
spell-check, v0.68.4 (active)
status-bar, v1.4.1 (active)
styleguide, v0.47.2 (active)
symbols-view, v0.113.1 (inactive)
tabs, v0.103.0 (active)
timecop, v0.33.2 (active)
tree-view, v0.210.0 (active)
update-package-dependencies, v0.10.0 (active)
welcome, v0.35.1 (active)
whitespace, v0.35.0 (active)
wrap-guide, v0.38.2 (active)
language-c, v0.54.0 (active)
language-clojure, v0.22.1 (active)
language-coffee-script, v0.48.0 (active)
language-csharp, v0.12.1 (active)
language-css, v0.40.1 (active)
language-gfm, v0.88.0 (active)
language-git, v0.15.0 (active)
language-go, v0.43.0 (active)
language-html, v0.46.1 (active)
language-hyperlink, v0.16.1 (active)
language-java, v0.24.0 (active)
language-javascript, v0.122.0 (active)
language-json, v0.18.3 (active)
language-less, v0.29.6 (active)
language-make, v0.22.2 (active)
language-mustache, v0.13.0 (active)
language-objective-c, v0.15.1 (active)
language-perl, v0.37.0 (active)
language-php, v0.37.3 (active)
language-property-list, v0.8.0 (active)
language-python, v0.45.1 (active)
language-ruby, v0.70.2 (active)
language-ruby-on-rails, v0.25.1 (active)
language-sass, v0.57.0 (active)
language-shellscript, v0.23.0 (active)
language-source, v0.9.0 (active)
language-sql, v0.25.0 (active)
language-text, v0.7.1 (active)
language-todo, v0.29.1 (active)
language-toml, v0.18.1 (active)
language-xml, v0.34.12 (active)
language-yaml, v0.27.1 (active)

# Dev
No dev packages

Nov 14 '16 15:11 NKjoep

I just realised you already closed a similar issue some months ago, but I still have this problem

Nov 14 '16 15:11 NKjoep

it happened when you were editing Python file, right?

Do you have Python interpreter installed on your system? (and what operating system you're working on?)

Nov 14 '16 18:11 hex13

No, it didn't. I was editing a normal js file.

And yes, I do have a python interpreter since I am running Mac OS X 10.12.1 as you can see from the bug report.

Nov 14 '16 20:11 NKjoep

I am running Mac OS X 10.12.1 as you can see from the bug report. yes, I overlooked this fact.

No, it didn't. I was editing a normal js file. strange, because in theory python module of Lupa shouldn't be active in other files than *py. I will have to look on it.

Nov 14 '16 20:11 hex13

I've discovered that script which analyses Python* runs always (even with JavaScript files). This can affects performance ( #36 ) but it shouldn't trigger errors (at least I cannot reproduce this bug - it works on my version of Atom 1.12.5, and it works in CLI on Node 6.0 and on Node 4.6).

I thought first maybe stdio streams are not configured properly in child_process.spawn I will examine that further, but if it works when I run this... I don't know.

Second thing is I've found this StackOverflow thread: http://stackoverflow.com/questions/16170375/nodejs-not-spawning-child-process-except-in-tests kierans (one of StackOverflow users) wrote there: The problem was that the spawn method created on the Object prototype (see this article on Protypical inheritance) was causing the child_process.spawn function to be replaced, so the wrong function was being called.

Maybe that's the case? Maybe some package you've installed replace spawn function on Object.prototype?

I will examine that further.

https://github.com/hex13/lupa/blob/master/plugins/python.js

Nov 25 '16 12:11 hex13