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I am using coffeescript+ruby-on-rails. The pilation of coffeescript into pure JS leads to an error if there is a syntax problem in the coffee code. On the browser when I run the app, I get this error: ExecJS::RuntimeError

Is there any way to find out what caused the pilation error, when it was trying to pile coffee code to JS? Attached is a screenshot of the error

Following is the entry in the server log, which no way indicates the file which actually caused the syntax error:

ActionView::Template::Error (SyntaxError: [stdin]:25:10: unexpected :):
    4:     <meta name="viewport" content="width=device-width, initial-scale=1.0">
    5:     <title><%= content_for?(:title) ? yield(:title) : "Inmonarch Website" %></title>
    6:     <meta name="description" content="<%= content_for?(:description) ? yield(:description) : "Inmonarch Website" %>">
    7:     <%= stylesheet_link_tag 'application', media: 'all' %>
    8:     <%= javascript_include_tag 'application' %>
    9:     <%= csrf_meta_tags %>
   10:   </head>
  app/views/layouts/dashboard.html.erb:7:in `_app_views_layouts_dashboard_html_erb__3120053487817944018_56303120'


  Rendered /home/vipin8169/.rvm/gems/ruby-2.2.3@rails426/gems/actionpack-4.2.6/lib/action_dispatch/middleware/templates/rescues/_source.erb (7.4ms)
  Rendered /home/vipin8169/.rvm/gems/ruby-2.2.3@rails426/gems/actionpack-4.2.6/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb (3.0ms)
  Rendered /home/vipin8169/.rvm/gems/ruby-2.2.3@rails426/gems/actionpack-4.2.6/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb (1.6ms)
  Rendered /home/vipin8169/.rvm/gems/ruby-2.2.3@rails426/gems/actionpack-4.2.6/lib/action_dispatch/middleware/templates/rescues/template_error.html.erb within rescues/layout (25.5ms)
  Rendered /home/vipin8169/.rvm/gems/ruby-2.2.3@rails426/gems/web-console-2.3.0/lib/web_console/templates/_markup.html.erb (0.3ms)
  Rendered /home/vipin8169/.rvm/gems/ruby-2.2.3@rails426/gems/web-console-2.3.0/lib/web_console/templates/_inner_console_markup.html.erb within layouts/inlined_string (0.3ms)
  Rendered /home/vipin8169/.rvm/gems/ruby-2.2.3@rails426/gems/web-console-2.3.0/lib/web_console/templates/_prompt_box_markup.html.erb within layouts/inlined_string (0.3ms)
  Rendered /home/vipin8169/.rvm/gems/ruby-2.2.3@rails426/gems/web-console-2.3.0/lib/web_console/templates/style.css.erb within layouts/inlined_string (0.3ms)
  Rendered /home/vipin8169/.rvm/gems/ruby-2.2.3@rails426/gems/web-console-2.3.0/lib/web_console/templates/console.js.erb within layouts/javascript (296.8ms)
  Rendered /home/vipin8169/.rvm/gems/ruby-2.2.3@rails426/gems/web-console-2.3.0/lib/web_console/templates/main.js.erb within layouts/javascript (0.2ms)
  Rendered /home/vipin8169/.rvm/gems/ruby-2.2.3@rails426/gems/web-console-2.3.0/lib/web_console/templates/error_page.js.erb within layouts/javascript (0.3ms)
  Rendered /home/vipin8169/.rvm/gems/ruby-2.2.3@rails426/gems/web-console-2.3.0/lib/web_console/templates/index.html.erb (313.8ms)

PS:- I know what the syntax error is, I made the syntax error deliberately to find out if I am able to trace the error with the help of logs, which I couldn't.

I am using coffeescript+ruby-on-rails. The pilation of coffeescript into pure JS leads to an error if there is a syntax problem in the coffee code. On the browser when I run the app, I get this error: ExecJS::RuntimeError

Is there any way to find out what caused the pilation error, when it was trying to pile coffee code to JS? Attached is a screenshot of the error

Following is the entry in the server log, which no way indicates the file which actually caused the syntax error:

ActionView::Template::Error (SyntaxError: [stdin]:25:10: unexpected :):
    4:     <meta name="viewport" content="width=device-width, initial-scale=1.0">
    5:     <title><%= content_for?(:title) ? yield(:title) : "Inmonarch Website" %></title>
    6:     <meta name="description" content="<%= content_for?(:description) ? yield(:description) : "Inmonarch Website" %>">
    7:     <%= stylesheet_link_tag 'application', media: 'all' %>
    8:     <%= javascript_include_tag 'application' %>
    9:     <%= csrf_meta_tags %>
   10:   </head>
  app/views/layouts/dashboard.html.erb:7:in `_app_views_layouts_dashboard_html_erb__3120053487817944018_56303120'


  Rendered /home/vipin8169/.rvm/gems/ruby-2.2.3@rails426/gems/actionpack-4.2.6/lib/action_dispatch/middleware/templates/rescues/_source.erb (7.4ms)
  Rendered /home/vipin8169/.rvm/gems/ruby-2.2.3@rails426/gems/actionpack-4.2.6/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb (3.0ms)
  Rendered /home/vipin8169/.rvm/gems/ruby-2.2.3@rails426/gems/actionpack-4.2.6/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb (1.6ms)
  Rendered /home/vipin8169/.rvm/gems/ruby-2.2.3@rails426/gems/actionpack-4.2.6/lib/action_dispatch/middleware/templates/rescues/template_error.html.erb within rescues/layout (25.5ms)
  Rendered /home/vipin8169/.rvm/gems/ruby-2.2.3@rails426/gems/web-console-2.3.0/lib/web_console/templates/_markup.html.erb (0.3ms)
  Rendered /home/vipin8169/.rvm/gems/ruby-2.2.3@rails426/gems/web-console-2.3.0/lib/web_console/templates/_inner_console_markup.html.erb within layouts/inlined_string (0.3ms)
  Rendered /home/vipin8169/.rvm/gems/ruby-2.2.3@rails426/gems/web-console-2.3.0/lib/web_console/templates/_prompt_box_markup.html.erb within layouts/inlined_string (0.3ms)
  Rendered /home/vipin8169/.rvm/gems/ruby-2.2.3@rails426/gems/web-console-2.3.0/lib/web_console/templates/style.css.erb within layouts/inlined_string (0.3ms)
  Rendered /home/vipin8169/.rvm/gems/ruby-2.2.3@rails426/gems/web-console-2.3.0/lib/web_console/templates/console.js.erb within layouts/javascript (296.8ms)
  Rendered /home/vipin8169/.rvm/gems/ruby-2.2.3@rails426/gems/web-console-2.3.0/lib/web_console/templates/main.js.erb within layouts/javascript (0.2ms)
  Rendered /home/vipin8169/.rvm/gems/ruby-2.2.3@rails426/gems/web-console-2.3.0/lib/web_console/templates/error_page.js.erb within layouts/javascript (0.3ms)
  Rendered /home/vipin8169/.rvm/gems/ruby-2.2.3@rails426/gems/web-console-2.3.0/lib/web_console/templates/index.html.erb (313.8ms)

PS:- I know what the syntax error is, I made the syntax error deliberately to find out if I am able to trace the error with the help of logs, which I couldn't.

• javascript
• ruby-on-rails-4
• coffeescript
• pre-pilation

Share Improve this question Follow edited May 23, 2017 at 12:33 CommunityBot 111 silver badge asked Mar 12, 2016 at 8:42 Vipin VermaVipin Verma 5,7351313 gold badges5656 silver badges9797 bronze badges 9

• Here is a low-quality answer: from your data I feel that "SyntaxError: [stdin]:25:10: unexpected :" is interesting - you could dig to find that stdin and try to look around line 25, symbol 10 and something could be wrong with ':' symbol. You also have options to see 'Application Trace' 'Framework Trace' or 'Full Trace' - generaly those things have interesting info too. – Jaiden Snow Commented Mar 12, 2016 at 10:57
• Here is another low-quality method: you could reduce your coffeeScript step-by-step, throwing away feature-by-feature of your script until you get no pilation errors. This could indicate a place where things went wrong. You could use external syntax-checker tool to test your coffeeScript code as it seems that you have a syntax error. – Jaiden Snow Commented Mar 12, 2016 at 11:02
• 'Application Trace' 'Framework Trace' or 'Full Trace' doesn't have anything useful. 25:10 correctly says about the location of the error, but how do I get to know the file name in which the syntax error is present? What does [stdin] refer to? – Vipin Verma Commented Mar 12, 2016 at 11:03
• @Carpetsmoker I didn't include the code because it was not required. I know what the syntax error is, I made the syntax error deliberately to find out if I am able to trace the error with the help of logs, which I couldn't. Hence, I posted a question here. – Vipin Verma Commented Mar 14, 2016 at 5:21
• Probably, I was not clear enough. Sorry. – Vipin Verma Commented Mar 14, 2016 at 5:23

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2 Answers 2

Sorted by: Reset to default 10

One workaround is to pile your .coffee files outside rails to get a decent error message:

If you don't yet have it:

npm i coffee-script -g

Then in a parent directory of your .coffee files:

coffee --output deleteme --pile .

When you're done, delete the deleteme folder it created (which is only created if you fix all the errors). This should find the syntax error for you and tell you exactly where it is.

You can use an online linter like http://www.coffeelint/ if you know its coffeescript causing the error

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