autoprefixer-rails: 7.2.4 ExecJS::RuntimeError: SyntaxError: Unexpected token , in JSON at position 3

After upgrading autoprefixer-rails to 7.2.4 I cannot precompile my assets anylonger. It even doesn’t work if I have a clean application.css.

With version 7.2.3 everything works as expected.

May there be an error in autoprefixer.js?

Ruby version is 2.4.2 and Rails version is 5.1.4

Stacktrace:

** Execute assets:precompile
rake aborted!
ExecJS::RuntimeError: SyntaxError: Unexpected token , in JSON at position 3
JSON.parse (<anonymous>)
Object.parseSourceMapInput ((execjs):23959:15)
new SourceMapConsumer ((execjs):21685:22)
PreviousMap.consumer ((execjs):19209:34)
new Input ((execjs):16624:28)
parse ((execjs):18260:17)
new LazyResult ((execjs):16827:24)
Processor.process ((execjs):19427:12)
Function.creator.process ((execjs):18989:43)
process ((execjs):24220:45)
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/execjs-2.7.0/lib/execjs/external_runtime.rb:39:in `exec'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/execjs-2.7.0/lib/execjs/external_runtime.rb:21:in `eval'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/execjs-2.7.0/lib/execjs/external_runtime.rb:46:in `call'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/autoprefixer-rails-7.2.4/lib/autoprefixer-rails/processor.rb:36:in `process'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/autoprefixer-rails-7.2.4/lib/autoprefixer-rails/sprockets.rb:20:in `run'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/autoprefixer-rails-7.2.4/lib/autoprefixer-rails/sprockets.rb:14:in `call'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/sprockets-3.7.1/lib/sprockets/processor_utils.rb:75:in `call_processor'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/sprockets-3.7.1/lib/sprockets/processor_utils.rb:57:in `block in call_processors'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/sprockets-3.7.1/lib/sprockets/processor_utils.rb:56:in `reverse_each'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/sprockets-3.7.1/lib/sprockets/processor_utils.rb:56:in `call_processors'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/sprockets-3.7.1/lib/sprockets/loader.rb:134:in `load_from_unloaded'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/sprockets-3.7.1/lib/sprockets/loader.rb:60:in `block in load'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/sprockets-3.7.1/lib/sprockets/loader.rb:317:in `fetch_asset_from_dependency_cache'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/sprockets-3.7.1/lib/sprockets/loader.rb:44:in `load'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/sprockets-3.7.1/lib/sprockets/cached_environment.rb:20:in `block in initialize'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/sprockets-3.7.1/lib/sprockets/cached_environment.rb:47:in `load'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/sprockets-3.7.1/lib/sprockets/bundle.rb:23:in `block in call'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/sprockets-3.7.1/lib/sprockets/utils.rb:200:in `dfs'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/sprockets-3.7.1/lib/sprockets/bundle.rb:24:in `call'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/sprockets-3.7.1/lib/sprockets/processor_utils.rb:75:in `call_processor'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/sprockets-3.7.1/lib/sprockets/processor_utils.rb:57:in `block in call_processors'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/sprockets-3.7.1/lib/sprockets/processor_utils.rb:56:in `reverse_each'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/sprockets-3.7.1/lib/sprockets/processor_utils.rb:56:in `call_processors'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/sprockets-3.7.1/lib/sprockets/loader.rb:134:in `load_from_unloaded'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/sprockets-3.7.1/lib/sprockets/loader.rb:60:in `block in load'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/sprockets-3.7.1/lib/sprockets/loader.rb:317:in `fetch_asset_from_dependency_cache'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/sprockets-3.7.1/lib/sprockets/loader.rb:44:in `load'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/sprockets-3.7.1/lib/sprockets/cached_environment.rb:20:in `block in initialize'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/sprockets-3.7.1/lib/sprockets/cached_environment.rb:47:in `load'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/sprockets-3.7.1/lib/sprockets/base.rb:66:in `find_asset'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/sprockets-3.7.1/lib/sprockets/base.rb:73:in `find_all_linked_assets'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/sprockets-3.7.1/lib/sprockets/manifest.rb:134:in `block in find'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/sprockets-3.7.1/lib/sprockets/manifest.rb:133:in `each'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/sprockets-3.7.1/lib/sprockets/manifest.rb:133:in `find'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/sprockets-3.7.1/lib/sprockets/manifest.rb:185:in `compile'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/sprockets-rails-3.2.1/lib/sprockets/rails/task.rb:68:in `block (3 levels) in define'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/sprockets-3.7.1/lib/rake/sprocketstask.rb:147:in `with_logger'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/sprockets-rails-3.2.1/lib/sprockets/rails/task.rb:67:in `block (2 levels) in define'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/rake-12.3.0/lib/rake/task.rb:251:in `block in execute'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/rake-12.3.0/lib/rake/task.rb:251:in `each'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/rake-12.3.0/lib/rake/task.rb:251:in `execute'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/airbrake-7.1.1/lib/airbrake/rake.rb:19:in `execute'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/rake-12.3.0/lib/rake/task.rb:195:in `block in invoke_with_call_chain'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/2.4.0/monitor.rb:214:in `mon_synchronize'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/rake-12.3.0/lib/rake/task.rb:188:in `invoke_with_call_chain'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/rake-12.3.0/lib/rake/task.rb:181:in `invoke'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/rake-12.3.0/lib/rake/application.rb:160:in `invoke_task'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/rake-12.3.0/lib/rake/application.rb:116:in `block (2 levels) in top_level'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/rake-12.3.0/lib/rake/application.rb:116:in `each'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/rake-12.3.0/lib/rake/application.rb:116:in `block in top_level'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/rake-12.3.0/lib/rake/application.rb:125:in `run_with_threads'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/rake-12.3.0/lib/rake/application.rb:110:in `top_level'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/rake-12.3.0/lib/rake/application.rb:83:in `block in run'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/rake-12.3.0/lib/rake/application.rb:186:in `standard_exception_handling'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/rake-12.3.0/lib/rake/application.rb:80:in `run'
/Users/pabse/project/bin/rake:9:in `<top (required)>'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:286:in `load'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:286:in `block in load'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:258:in `load_dependency'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/gems/2.4.0/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:286:in `load'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/site_ruby/2.4.0/rubygems/core_ext/kernel_require.rb:59:in `require'
/Users/pabse/.rbenv/versions/2.4.2/lib/ruby/site_ruby/2.4.0/rubygems/core_ext/kernel_require.rb:59:in `require'
-e:1:in `<main>'
Tasks: TOP => assets:precompile

About this issue

Original URL
State: closed
Created 6 years ago
Reactions: 15
Comments: 32 (12 by maintainers)

Commits related to this issue

Update autoprefixer-rails dependency to >= 9.1.4 autoprefixer-rails 9.1.4 fixes the issue described here: https://github.com/ai/autoprefixer-rails/issues/130. I can reproduce this bug when using aut... — committed to heimpogo/middleman-autoprefixer by heimpogo 6 years ago

Most upvoted comments

I’m using the sassc-rails gem and had this error. I managed to fix this by adjusting my config/environments/development.rb configuration file to include the line:

config.sass.inline_source_maps = false

MikeRogers0 on May 31, 2018

@vindia I am planning to remove all other ExecJS runtimes and keep only Node.js. So the problem will be solved 😄.

ai on Mar 26, 2018

I encountered the same issue while updating a rails project to 5.1.6. Last working version is 7.2.3 … tried all up to 9.0.0 (with mini_racer)

stepahn on Jul 25, 2018