Preview markdown failed with r.trim is not a function error

[iby]

Every time when relaunching Atom with markdown preview open the opened preview shows an error. Saving (just opened / not changed file) or typing something causes the preview to refresh and the error immediately goes goes away. The same seems to happen when opening the preview for the first time (in Atom session), saving doesn't work, but modifying a file fixes it.

First noticed in late 2019. Current Atom version: 1.50.0.

[lierdakil]

So... here's the problem: there is no r.trim (which is apparently not a function) in the code anywhere, and I am unable to reproduce the issue. So I have a creeping suspicion this might be interference from some other package. Would you mind posting the list of your installed packages (apm list) and/or testing if this issue goes away when other packages are disabled?

[mibradev]

@lierdakil This happened to me also, even after disabling all community packages.

apm list output:

Built-in Atom Packages (93)
├── atom-dark-syntax@0.29.1
├── atom-dark-ui@0.53.3
├── atom-light-syntax@0.29.1
├── atom-light-ui@0.46.3
├── base16-tomorrow-dark-theme@1.6.0
├── base16-tomorrow-light-theme@1.6.0
├── one-dark-ui@1.12.5
├── one-light-ui@1.12.5
├── one-dark-syntax@1.8.4
├── one-light-syntax@1.8.4
├── solarized-dark-syntax@1.3.0
├── solarized-light-syntax@1.3.0
├── about@1.9.1
├── archive-view@0.65.2
├── autocomplete-atom-api@0.10.7
├── autocomplete-css@0.17.5
├── autocomplete-html@0.8.8
├── autocomplete-plus@2.42.3
├── autocomplete-snippets@1.12.1
├── autoflow@0.29.4
├── autosave@0.24.6
├── background-tips@0.28.0
├── bookmarks@0.46.0
├── bracket-matcher@0.91.2
├── command-palette@0.43.5
├── dalek@0.2.2
├── deprecation-cop@0.56.9
├── dev-live-reload@0.48.1
├── encoding-selector@0.23.9
├── exception-reporting@0.43.1
├── find-and-replace@0.219.3
├── fuzzy-finder@1.14.2
├── github@0.34.2
├── git-diff@1.3.9
├── go-to-line@0.33.0
├── grammar-selector@0.50.1
├── image-view@0.64.0
├── incompatible-packages@0.27.3
├── keybinding-resolver@0.39.0
├── line-ending-selector@0.7.7
├── link@0.31.6
├── markdown-preview@0.160.2
├── metrics@1.8.1
├── notifications@0.71.0
├── open-on-github@1.3.2
├── package-generator@1.3.0
├── settings-view@0.261.4
├── snippets@1.5.1
├── spell-check@0.76.1
├── status-bar@1.8.17
├── styleguide@0.49.12
├── symbols-view@0.118.4
├── tabs@0.110.0
├── timecop@0.36.2
├── tree-view@0.228.0
├── update-package-dependencies@0.13.1
├── welcome@0.36.9
├── whitespace@0.37.7
├── wrap-guide@0.41.0
├── language-c@0.60.19
├── language-clojure@0.22.8
├── language-coffee-script@0.50.0
├── language-csharp@1.1.0
├── language-css@0.44.4
├── language-gfm@0.90.8
├── language-git@0.19.1
├── language-go@0.47.2
├── language-html@0.53.1
├── language-hyperlink@0.17.1
├── language-java@0.31.5
├── language-javascript@0.134.1
├── language-json@1.0.5
├── language-less@0.34.3
├── language-make@0.23.0
├── language-mustache@0.14.5
├── language-objective-c@0.16.0
├── language-perl@0.38.1
├── language-php@0.44.5
├── language-property-list@0.9.1
├── language-python@0.53.4
├── language-ruby@0.72.23
├── language-ruby-on-rails@0.25.3
├── language-rust-bundled@0.1.0
├── language-sass@0.62.1
├── language-shellscript@0.28.2
├── language-source@0.9.0
├── language-sql@0.25.10
├── language-text@0.7.4
├── language-todo@0.29.4
├── language-toml@0.20.0
├── language-typescript@0.6.3
├── language-xml@0.35.3
└── language-yaml@0.32.0

Community Packages (2)
├── sort-lines@0.19.0
└── toggle-quotes@1.1.4

[iby]

Whoops, sorry, completely lost track of this:

$ apm list
Built-in Atom Packages (93)
├── atom-dark-syntax@0.29.1
├── atom-dark-ui@0.53.3
├── atom-light-syntax@0.29.1
├── atom-light-ui@0.46.3
├── base16-tomorrow-dark-theme@1.6.0
├── base16-tomorrow-light-theme@1.6.0
├── one-dark-ui@1.12.5
├── one-light-ui@1.12.5
├── one-dark-syntax@1.8.4
├── one-light-syntax@1.8.4
├── solarized-dark-syntax@1.3.0
├── solarized-light-syntax@1.3.0
├── about@1.9.1
├── archive-view@0.65.2
├── autocomplete-atom-api@0.10.7
├── autocomplete-css@0.17.5
├── autocomplete-html@0.8.8
├── autocomplete-plus@2.42.3
├── autocomplete-snippets@1.12.1
├── autoflow@0.29.4
├── autosave@0.24.6
├── background-tips@0.28.0
├── bookmarks@0.46.0
├── bracket-matcher@0.91.2
├── command-palette@0.43.5
├── dalek@0.2.2
├── deprecation-cop@0.56.9
├── dev-live-reload@0.48.1
├── encoding-selector@0.23.9
├── exception-reporting@0.43.1
├── find-and-replace@0.219.3
├── fuzzy-finder@1.14.2
├── github@0.34.2
├── git-diff@1.3.9
├── go-to-line@0.33.0
├── grammar-selector@0.50.1
├── image-view@0.64.0
├── incompatible-packages@0.27.3
├── keybinding-resolver@0.39.0
├── line-ending-selector@0.7.7
├── link@0.31.6
├── markdown-preview@0.160.2
├── metrics@1.8.1
├── notifications@0.71.0
├── open-on-github@1.3.2
├── package-generator@1.3.0
├── settings-view@0.261.4
├── snippets@1.5.1
├── spell-check@0.76.1
├── status-bar@1.8.17
├── styleguide@0.49.12
├── symbols-view@0.118.4
├── tabs@0.110.0
├── timecop@0.36.2
├── tree-view@0.228.0
├── update-package-dependencies@0.13.1
├── welcome@0.36.9 (disabled)
├── whitespace@0.37.7
├── wrap-guide@0.41.0 (disabled)
├── language-c@0.60.19
├── language-clojure@0.22.8
├── language-coffee-script@0.50.0
├── language-csharp@1.1.0
├── language-css@0.44.4
├── language-gfm@0.90.8
├── language-git@0.19.1
├── language-go@0.47.2
├── language-html@0.53.1
├── language-hyperlink@0.17.1
├── language-java@0.31.5
├── language-javascript@0.134.1
├── language-json@1.0.5
├── language-less@0.34.3
├── language-make@0.23.0
├── language-mustache@0.14.5
├── language-objective-c@0.16.0
├── language-perl@0.38.1
├── language-php@0.44.5
├── language-property-list@0.9.1
├── language-python@0.53.4
├── language-ruby@0.72.23
├── language-ruby-on-rails@0.25.3
├── language-rust-bundled@0.1.0
├── language-sass@0.62.1
├── language-shellscript@0.28.2
├── language-source@0.9.0
├── language-sql@0.25.10
├── language-text@0.7.4
├── language-todo@0.29.4
├── language-toml@0.20.0
├── language-typescript@0.6.3
├── language-xml@0.35.3
└── language-yaml@0.32.0

Community Packages (0) /Users/ianbytchek/.atom/packages
└── (empty)

Just in case:

Electron: 5.0.13 Chrome: 73.0.3683.121 Node: v12.0.0

config.cson:

"*":
  core:
    disabledPackages: [
      "welcome"
      "wrap-guide"
    ]
    telemetryConsent: "no"
    themes: [
      "one-light-ui"
      "one-light-syntax"
    ]
  editor:
    fontSize: 10
    tabLength: 4
  "one-dark-ui":
    fontSize: 11
  "tree-view":
    hideIgnoredNames: true
  welcome:
    showOnStartup: false
  whitespace:
    ensureSingleTrailingNewline: false

I can see wrap-guide is disabled, can this have anything to do with wrapping?

[lierdakil]

Uh... I'm sorry, maybe I'm misunderstanding something? The outputs of apm list posted here don't show markdown-preview-PLUS package being installed.

I was able to reproduce the issue on the built-in markdown-preview package (notice the lack of -plus suffix). So it seems like this is a wrong repo? The built-in markdown-preview is here: https://github.com/atom/markdown-preview

P.S. I've found the relevant bug report for markdown-preview here: https://github.com/atom/markdown-preview/issues/579

[mibradev]

@lierdakil Uh-oh, sorry. And thank you for the explanation.

[iby]

Whoaah… this is embarrassing. Sorry for the distraction and thanks for the details! ✌️