Autoprefixer not working with Compass

[scottnix]

Can't really find information on why it isn't working. Super simple setup, not much info out there on others with similar issues. This information is just for me to reference so I don't have to go through the process of reproducing the error to get more information.

config.rb

require 'autoprefixer-rails'

on_stylesheet_saved do |file|
  css = File.read(file)
  File.open(file, 'w') do |io|
    io << AutoprefixerRails.process(css)
  end
end

compass watch (error without trace)

ExecJS::ProgramError on line ["68"] of C: TypeError: Object doesn't support this property or method

compass watch --trace

ExecJS::ProgramError on line ["68"] of C: TypeError: Object doesn't support this property or method
  C:/Ruby193/lib/ruby/gems/1.9.1/gems/execjs-2.0.2/lib/execjs/external_runtime.rb:28:in `block in exec'
  C:/Ruby193/lib/ruby/gems/1.9.1/gems/execjs-2.0.2/lib/execjs/external_runtime.rb:41:in `compile_to_tempfile'
  C:/Ruby193/lib/ruby/gems/1.9.1/gems/execjs-2.0.2/lib/execjs/external_runtime.rb:27:in `exec'
  C:/Ruby193/lib/ruby/gems/1.9.1/gems/execjs-2.0.2/lib/execjs/external_runtime.rb:19:in `eval'
  C:/Ruby193/lib/ruby/gems/1.9.1/gems/execjs-2.0.2/lib/execjs/external_runtime.rb:33:in `call'
  C:/Ruby193/lib/ruby/gems/1.9.1/gems/autoprefixer-rails-1.1.20140327/lib/autoprefixer-rails/processor.rb:20:in `p
rocess'
  C:/Ruby193/lib/ruby/gems/1.9.1/gems/autoprefixer-rails-1.1.20140327/lib/autoprefixer-rails.rb:10:in `process'
  C:/xampp/htdocs/githubs/wp-content/themes/scottnix2014/config.rb:25:in `block (2 levels) in get_binding'
  C:/xampp/htdocs/githubs/wp-content/themes/scottnix2014/config.rb:24:in `open'
  C:/xampp/htdocs/githubs/wp-content/themes/scottnix2014/config.rb:24:in `block in get_binding'
  C:/Ruby193/lib/ruby/gems/1.9.1/gems/sass-3.3.4/lib/sass/callbacks.rb:61:in `[]'
  C:/Ruby193/lib/ruby/gems/1.9.1/gems/sass-3.3.4/lib/sass/callbacks.rb:61:in `block in run_stylesheet_saved'
  C:/Ruby193/lib/ruby/gems/1.9.1/gems/sass-3.3.4/lib/sass/callbacks.rb:61:in `each'
  C:/Ruby193/lib/ruby/gems/1.9.1/gems/sass-3.3.4/lib/sass/callbacks.rb:61:in `run_stylesheet_saved'
  C:/Ruby193/lib/ruby/gems/1.9.1/gems/compass-core-1.0.0.alpha.19/lib/compass/configuration/inheritance.rb:167:in
`run_stylesheet_saved'
  C:/Ruby193/lib/ruby/gems/1.9.1/gems/compass-core-1.0.0.alpha.19/lib/compass/configuration/inheritance.rb:169:in
`run_stylesheet_saved'
  C:/Ruby193/lib/ruby/gems/1.9.1/gems/compass-1.0.0.alpha.19/lib/compass/compiler.rb:177:in `compile'
  C:/Ruby193/lib/ruby/gems/1.9.1/gems/compass-1.0.0.alpha.19/lib/compass/compiler.rb:144:in `compile_if_required'
  C:/Ruby193/lib/ruby/gems/1.9.1/gems/compass-1.0.0.alpha.19/lib/compass/compiler.rb:129:in `block (2 levels) in r
un'
  C:/Ruby193/lib/ruby/gems/1.9.1/gems/compass-1.0.0.alpha.19/lib/compass/compiler.rb:127:in `each'
  C:/Ruby193/lib/ruby/gems/1.9.1/gems/compass-1.0.0.alpha.19/lib/compass/compiler.rb:127:in `block in run'
  C:/Ruby193/lib/ruby/gems/1.9.1/gems/compass-1.0.0.alpha.19/lib/compass/compiler.rb:153:in `timed'
  C:/Ruby193/lib/ruby/gems/1.9.1/gems/compass-1.0.0.alpha.19/lib/compass/compiler.rb:126:in `run'
  C:/Ruby193/lib/ruby/gems/1.9.1/gems/compass-1.0.0.alpha.19/lib/compass/watcher/compiler.rb:24:in `compile'
  C:/Ruby193/lib/ruby/1.9.1/forwardable.rb:201:in `compile'
  C:/Ruby193/lib/ruby/gems/1.9.1/gems/compass-1.0.0.alpha.19/lib/compass/watcher/project_watcher.rb:101:in `sass_m
odified'
  C:/Ruby193/lib/ruby/gems/1.9.1/gems/compass-1.0.0.alpha.19/lib/compass/watcher/project_watcher.rb:89:in `sass_ca
llback'
  C:/Ruby193/lib/ruby/gems/1.9.1/gems/compass-1.0.0.alpha.19/lib/compass/watcher/watch.rb:14:in `call'
  C:/Ruby193/lib/ruby/gems/1.9.1/gems/compass-1.0.0.alpha.19/lib/compass/watcher/watch.rb:14:in `run_callback'
  C:/Ruby193/lib/ruby/gems/1.9.1/gems/compass-1.0.0.alpha.19/lib/compass/watcher/project_watcher.rb:69:in `block i
n listen_callback'
  C:/Ruby193/lib/ruby/gems/1.9.1/gems/compass-1.0.0.alpha.19/lib/compass/watcher/project_watcher.rb:66:in `each'
  C:/Ruby193/lib/ruby/gems/1.9.1/gems/compass-1.0.0.alpha.19/lib/compass/watcher/project_watcher.rb:66:in `listen_
callback'
  C:/Ruby193/lib/ruby/gems/1.9.1/gems/listen-1.1.6/lib/listen/listener.rb:236:in `call'
  C:/Ruby193/lib/ruby/gems/1.9.1/gems/listen-1.1.6/lib/listen/listener.rb:236:in `on_change'
  C:/Ruby193/lib/ruby/gems/1.9.1/gems/listen-1.1.6/lib/listen/listener.rb:271:in `block in initialize_adapter'
  C:/Ruby193/lib/ruby/gems/1.9.1/gems/listen-1.1.6/lib/listen/adapter.rb:244:in `call'
  C:/Ruby193/lib/ruby/gems/1.9.1/gems/listen-1.1.6/lib/listen/adapter.rb:244:in `report_changes'
  C:/Ruby193/lib/ruby/gems/1.9.1/gems/listen-1.1.6/lib/listen/adapter.rb:313:in `poll_changed_directories'
  C:/Ruby193/lib/ruby/gems/1.9.1/gems/listen-1.1.6/lib/listen/adapter.rb:289:in `block in start_poller'

gem query --local

autoprefixer-rails (1.1.20140327)
bigdecimal (1.1.0)
celluloid (0.15.2)
chunky_png (1.3.0, 1.2.9)
compass (1.0.0.alpha.19, 0.12.4, 0.12.2)
compass-core (1.0.0.alpha.19)
compass-import-once (1.0.4)
csso-rails (0.3.4)
execjs (2.0.2)
ffi (1.9.3 x86-mingw32)
fssm (0.2.10)
io-console (0.3)
json (1.8.1, 1.5.5)
listen (1.1.6)
minitest (5.3.1, 2.5.1)
multi_json (1.9.2)
rake (10.2.1, 0.9.2.2)
rb-fsevent (0.9.4)
rb-inotify (0.9.3)
rb-kqueue (0.2.2)
rdoc (4.1.1, 3.9.5)
sass (3.3.4, 3.2.18, 3.2.12)
susy (2.1.1, 1.0.9)
timers (1.1.0)
wdm (0.1.0)

[ghost]

Hiya, Did you ever manage to find out what the issue was? I am having the same drama. Super keen to get it to work.

[scottnix]

I couldn't find any information, Pretty sure I gave up trying to fix it after a few hours, but I was still hell-bent on using Autoprefixer.

I actually ended up switching my workflow to incorporate http://gulpjs.com/ which Autoprefixer worked in with no issues, not to mention gulp provided a ton of other benefits. So if you have a little free time, I highly recommend using gulp as a build system.

If you go that route, check out http://markgoodyear.com/2014/01/getting-started-with-gulp/ which made it pretty easy to setup.

If you are trying to get this setup for WordPress related projects, this is a very simple gulpfile.js I use https://github.com/scottnix/responsive-base-plus/blob/master/gulpfile.js which might help as a reference which uses Autoprefixer, Livereload, Sass. The gems Susy and Compass are also in there too, but require an addtional step of using @import 'susy'; in the actual Sass files.