Uglifier::Error: - Solution: Switch to terser

Hi there,

I am using:

• Ruby 3.1.2p20
• Rails 7.0.3
• Uglifier 4.2.0

In a previous version of Rails/Ruby (Rails 6 on Ruby 3.0), it was working correctly. However now I just see this:

$ RAILS_ENV=production bundle exec rails assets:precompile
autoprefixer: /Users/hackeron/Development/Tether/timeline/app/assets/stylesheets/application_dark_theme.scss:26033:3: Replace color-adjust to print-color-adjust. The color-adjust shorthand is currently deprecated.
rails aborted!
Uglifier::Error:

Tasks: TOP => assets:precompile
(See full trace by running task with --trace)

When I run with trace, I see this:

$ RAILS_ENV=production bundle exec rails assets:precompile --trace
** Invoke assets:precompile (first_time)
** Invoke assets:environment (first_time)
** Execute assets:environment
** Invoke environment (first_time)
** Execute environment
** Execute assets:precompile
autoprefixer: /Users/hackeron/Development/Tether/timeline/app/assets/stylesheets/application_dark_theme.scss:26033:3: Replace color-adjust to print-color-adjust. The color-adjust shorthand is currently deprecated.
rails aborted!
Uglifier::Error:
/usr/local/lib/ruby/gems/3.1.0/gems/uglifier-4.2.0/lib/uglifier.rb:291:in `parse_result'
/usr/local/lib/ruby/gems/3.1.0/gems/uglifier-4.2.0/lib/uglifier.rb:221:in `run_uglifyjs'
/usr/local/lib/ruby/gems/3.1.0/gems/uglifier-4.2.0/lib/uglifier.rb:166:in `compile'
/usr/local/lib/ruby/gems/3.1.0/gems/sprockets-4.0.3/lib/sprockets/compressing.rb:84:in `block in js_compressor='
/usr/local/lib/ruby/gems/3.1.0/gems/sprockets-4.0.3/lib/sprockets/processor_utils.rb:84:in `call_processor'
/usr/local/lib/ruby/gems/3.1.0/gems/sprockets-4.0.3/lib/sprockets/processor_utils.rb:66:in `block in call_processors'
/usr/local/lib/ruby/gems/3.1.0/gems/sprockets-4.0.3/lib/sprockets/processor_utils.rb:65:in `reverse_each'
/usr/local/lib/ruby/gems/3.1.0/gems/sprockets-4.0.3/lib/sprockets/processor_utils.rb:65:in `call_processors'
/usr/local/lib/ruby/gems/3.1.0/gems/sprockets-4.0.3/lib/sprockets/loader.rb:182:in `load_from_unloaded'
/usr/local/lib/ruby/gems/3.1.0/gems/sprockets-4.0.3/lib/sprockets/loader.rb:59:in `block in load'
/usr/local/lib/ruby/gems/3.1.0/gems/sprockets-4.0.3/lib/sprockets/loader.rb:337:in `fetch_asset_from_dependency_cache'
/usr/local/lib/ruby/gems/3.1.0/gems/sprockets-4.0.3/lib/sprockets/loader.rb:43:in `load'
/usr/local/lib/ruby/gems/3.1.0/gems/sprockets-4.0.3/lib/sprockets/cached_environment.rb:44:in `load'
/usr/local/lib/ruby/gems/3.1.0/gems/sprockets-4.0.3/lib/sprockets/bundle.rb:32:in `block in call'
/usr/local/Cellar/ruby/3.1.2/lib/ruby/3.1.0/set.rb:511:in `each_key'
/usr/local/Cellar/ruby/3.1.2/lib/ruby/3.1.0/set.rb:511:in `each'
/usr/local/lib/ruby/gems/3.1.0/gems/sprockets-4.0.3/lib/sprockets/bundle.rb:31:in `call'
/usr/local/lib/ruby/gems/3.1.0/gems/sprockets-4.0.3/lib/sprockets/processor_utils.rb:84:in `call_processor'
/usr/local/lib/ruby/gems/3.1.0/gems/sprockets-4.0.3/lib/sprockets/processor_utils.rb:66:in `block in call_processors'
/usr/local/lib/ruby/gems/3.1.0/gems/sprockets-4.0.3/lib/sprockets/processor_utils.rb:65:in `reverse_each'
/usr/local/lib/ruby/gems/3.1.0/gems/sprockets-4.0.3/lib/sprockets/processor_utils.rb:65:in `call_processors'
/usr/local/lib/ruby/gems/3.1.0/gems/sprockets-4.0.3/lib/sprockets/loader.rb:182:in `load_from_unloaded'
/usr/local/lib/ruby/gems/3.1.0/gems/sprockets-4.0.3/lib/sprockets/loader.rb:59:in `block in load'
/usr/local/lib/ruby/gems/3.1.0/gems/sprockets-4.0.3/lib/sprockets/loader.rb:337:in `fetch_asset_from_dependency_cache'
/usr/local/lib/ruby/gems/3.1.0/gems/sprockets-4.0.3/lib/sprockets/loader.rb:43:in `load'
/usr/local/lib/ruby/gems/3.1.0/gems/sprockets-4.0.3/lib/sprockets/cached_environment.rb:44:in `load'
/usr/local/lib/ruby/gems/3.1.0/gems/sprockets-4.0.3/lib/sprockets/base.rb:81:in `find_asset'
/usr/local/lib/ruby/gems/3.1.0/gems/sprockets-4.0.3/lib/sprockets/base.rb:88:in `find_all_linked_assets'
/usr/local/lib/ruby/gems/3.1.0/gems/sprockets-4.0.3/lib/sprockets/manifest.rb:125:in `each'
/usr/local/lib/ruby/gems/3.1.0/gems/sprockets-4.0.3/lib/sprockets/manifest.rb:125:in `to_a'
/usr/local/lib/ruby/gems/3.1.0/gems/sprockets-4.0.3/lib/sprockets/manifest.rb:125:in `block (2 levels) in find'
/usr/local/lib/ruby/gems/3.1.0/gems/concurrent-ruby-1.1.10/lib/concurrent-ruby/concurrent/executor/safe_task_executor.rb:24:in `block in execute'
/usr/local/lib/ruby/gems/3.1.0/gems/concurrent-ruby-1.1.10/lib/concurrent-ruby/concurrent/synchronization/mutex_lockable_object.rb:47:in `block in synchronize'
/usr/local/lib/ruby/gems/3.1.0/gems/concurrent-ruby-1.1.10/lib/concurrent-ruby/concurrent/synchronization/mutex_lockable_object.rb:47:in `synchronize'
/usr/local/lib/ruby/gems/3.1.0/gems/concurrent-ruby-1.1.10/lib/concurrent-ruby/concurrent/synchronization/mutex_lockable_object.rb:47:in `synchronize'
/usr/local/lib/ruby/gems/3.1.0/gems/concurrent-ruby-1.1.10/lib/concurrent-ruby/concurrent/executor/safe_task_executor.rb:22:in `execute'
/usr/local/lib/ruby/gems/3.1.0/gems/concurrent-ruby-1.1.10/lib/concurrent-ruby/concurrent/promise.rb:564:in `block in realize'
/usr/local/lib/ruby/gems/3.1.0/gems/concurrent-ruby-1.1.10/lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:352:in `run_task'
/usr/local/lib/ruby/gems/3.1.0/gems/concurrent-ruby-1.1.10/lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:343:in `block (3 levels) in create_worker'
/usr/local/lib/ruby/gems/3.1.0/gems/concurrent-ruby-1.1.10/lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:334:in `loop'
/usr/local/lib/ruby/gems/3.1.0/gems/concurrent-ruby-1.1.10/lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:334:in `block (2 levels) in create_worker'
/usr/local/lib/ruby/gems/3.1.0/gems/concurrent-ruby-1.1.10/lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:333:in `catch'
/usr/local/lib/ruby/gems/3.1.0/gems/concurrent-ruby-1.1.10/lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:333:in `block in create_worker'
Tasks: TOP => assets:precompile

The autoprefixer warning shows up when I disable uglifier too and doesn’t seem to be related to this.

I can’t for the life of me figure out what’s wrong… any ideas how to troubleshoot this or what could be going wrong?

[puneetpandey]

Hi @rgaufman, replacing config.assets.js_compressor = Uglifier.new(harmony: true) with the block below:

config.assets.configure do |env|
  env.js_compressor  = :uglifier # or :closure, :yui
  env.css_compressor = :sass   # or :yui
end

worked for me. I have gem "sprockets-rails", :require => 'sprockets/railtie' in my Gemfile.

Need to confirm if this is a valid fix.

[puneetpandey]

As per Uglifier’s Readme: UglifyJS only works with ES5. If you need to compress ES6, ruby-terser is a better option. It seems ES6 won’t work well with Uglifier