uglifier: Uglifier error in production mode on RoR 7.0.3.1 with Bootstrap 5.2

Ruby 3.1.2 Ruby on Rails 7.0.3.1 gem Uglifier 4.2.0 Third party library: Bootstrap 5.2 ( new version 5.2 released )

With bootstrap 5.1.3 (previous version) all works fine!

app/assets/config/manifest.js :

//= link_tree ../images
//= link_directory ../javascripts .js
//= link_directory ../stylesheets .css

//= link lib/bootstrap/5.2.0/js/bootstrap.bundle.min.js
//= link lib/bootstrap/5.2.0/js/bootstrap.min.js
//= link lib/bootstrap/5.2.0/css/bootstrap.min.css

in view stylesheets and javascripts are attached via stylesheet_link_tag and javascript_include_tag

config/environments/production.rb :

config.assets.compile = true
config.assets.js_compressor = Uglifier.new(harmony: true)

log/production.log :

I, [2022-08-04T20:29:16.542499 #11922]  INFO -- : [425e1b3d-5d27-4e00-afdf-d698f79e50ab] Started GET "/" for 127.0.0.1 at 2022-08-04 20:29:16 +0500
I, [2022-08-04T20:29:16.545698 #11922]  INFO -- : [425e1b3d-5d27-4e00-afdf-d698f79e50ab] Processing by ApplicationBaseController#index as HTML
I, [2022-08-04T20:29:16.554844 #11922]  INFO -- : [425e1b3d-5d27-4e00-afdf-d698f79e50ab]   Rendered application_base/index.html.erb within layouts/application (Duration: 0.9ms | Allocations: 314)
I, [2022-08-04T20:29:33.586606 #11922]  INFO -- : [425e1b3d-5d27-4e00-afdf-d698f79e50ab]   Rendered layout layouts/application.html.erb (Duration: 17032.8ms | Allocations: 628213)
I, [2022-08-04T20:29:33.586988 #11922]  INFO -- : [425e1b3d-5d27-4e00-afdf-d698f79e50ab] Completed 500 Internal Server Error in 17041ms (ActiveRecord: 0.7ms | Allocations: 630135)
F, [2022-08-04T20:29:33.587842 #11922] FATAL -- : [425e1b3d-5d27-4e00-afdf-d698f79e50ab]   
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] ActionView::Template::Error (
):
[425e1b3d-5d27-4e00-afdf-d698f79e50ab]   
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] uglifier (4.2.0) lib/uglifier.rb:291:in `parse_result'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] uglifier (4.2.0) lib/uglifier.rb:221:in `run_uglifyjs'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] uglifier (4.2.0) lib/uglifier.rb:166:in `compile'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/compressing.rb:84:in `block in js_compressor='
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/processor_utils.rb:84:in `call_processor'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/processor_utils.rb:66:in `block in call_processors'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/processor_utils.rb:65:in `reverse_each'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/processor_utils.rb:65:in `call_processors'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/loader.rb:182:in `load_from_unloaded'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/loader.rb:59:in `block in load'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/loader.rb:337:in `fetch_asset_from_dependency_cache'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/loader.rb:43:in `load'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/cached_environment.rb:44:in `block in load'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/cached_environment.rb:44:in `fetch'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/cached_environment.rb:44:in `load'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/bundle.rb:32:in `block in call'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] /home/ruby/.rbenv/versions/3.1.2/lib/ruby/3.1.0/set.rb:511:in `each_key'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] /home/ruby/.rbenv/versions/3.1.2/lib/ruby/3.1.0/set.rb:511:in `each'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/bundle.rb:31:in `call'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/processor_utils.rb:84:in `call_processor'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/processor_utils.rb:66:in `block in call_processors'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/processor_utils.rb:65:in `reverse_each'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/processor_utils.rb:65:in `call_processors'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/loader.rb:182:in `load_from_unloaded'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/loader.rb:59:in `block in load'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/loader.rb:337:in `fetch_asset_from_dependency_cache'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/loader.rb:43:in `load'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/cached_environment.rb:44:in `block in load'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/cached_environment.rb:44:in `fetch'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/cached_environment.rb:44:in `load'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/bundle.rb:32:in `block in call'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] /home/ruby/.rbenv/versions/3.1.2/lib/ruby/3.1.0/set.rb:511:in `each_key'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] /home/ruby/.rbenv/versions/3.1.2/lib/ruby/3.1.0/set.rb:511:in `each'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/bundle.rb:31:in `call'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/processor_utils.rb:84:in `call_processor'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/processor_utils.rb:66:in `block in call_processors'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/processor_utils.rb:65:in `reverse_each'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/processor_utils.rb:65:in `call_processors'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/loader.rb:182:in `load_from_unloaded'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/loader.rb:59:in `block in load'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/loader.rb:337:in `fetch_asset_from_dependency_cache'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/loader.rb:43:in `load'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/cached_environment.rb:44:in `block in load'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/cached_environment.rb:44:in `fetch'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/cached_environment.rb:44:in `load'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/base.rb:81:in `find_asset'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/base.rb:88:in `find_all_linked_assets'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/manifest.rb:125:in `each'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/manifest.rb:125:in `to_a'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] sprockets (4.1.1) lib/sprockets/manifest.rb:125:in `block (2 levels) in find'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] concurrent-ruby (1.1.10) lib/concurrent-ruby/concurrent/executor/safe_task_executor.rb:24:in `block in execute'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] concurrent-ruby (1.1.10) lib/concurrent-ruby/concurrent/synchronization/mutex_lockable_object.rb:47:in `block in synchronize'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] concurrent-ruby (1.1.10) lib/concurrent-ruby/concurrent/synchronization/mutex_lockable_object.rb:47:in `synchronize'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] concurrent-ruby (1.1.10) lib/concurrent-ruby/concurrent/synchronization/mutex_lockable_object.rb:47:in `synchronize'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] concurrent-ruby (1.1.10) lib/concurrent-ruby/concurrent/executor/safe_task_executor.rb:22:in `execute'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] concurrent-ruby (1.1.10) lib/concurrent-ruby/concurrent/promise.rb:564:in `block in realize'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] concurrent-ruby (1.1.10) lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:352:in `run_task'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] concurrent-ruby (1.1.10) lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:343:in `block (3 levels) in create_worker'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] concurrent-ruby (1.1.10) lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:334:in `loop'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] concurrent-ruby (1.1.10) lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:334:in `block (2 levels) in create_worker'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] concurrent-ruby (1.1.10) lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:333:in `catch'
[425e1b3d-5d27-4e00-afdf-d698f79e50ab] concurrent-ruby (1.1.10) lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:333:in `block in create_worker'

All other compressors are works with errors in this case

About this issue

Most upvoted comments

@itsalongstory Ah, ok - that explains it.

The README does say UglifyJS only works with ES5. If you need to compress ES6, [ruby-terser](https://github.com/ahorek/terser-ruby) is a better option.

I switched to terser and that solved my problem, so I think that’s the resolution for this issue. If terser doesn’t work for you I would suggest opening an issue against the terser repo.

+3
Jaco-Pretorius on Aug 16, 2022

I faced a similar problem. And I solved the problem by switching to terser. Thanks.

+1
bekkou68 on Jan 23, 2024

No way! I don’t see a solution, so I stayed on Bootstrap v5.1.3 for now. The fact is that technology is advancing, and RoR is no longer keeping up with them.

I think we should first understand why it’s blowing up. It’s not clear to me if the issue is in uglifier or in Bootstrap.

I think the problem is uglifier doesn’t full support ES6, and Bootstrap 5.2 has some new ES6 code.

+1
itsalongstory on Aug 16, 2022 
# gem 'uglifier', '~> 4.2'
gem 'terser', '~> 1.1', '>= 1.1.12'

# config.assets.js_compressor = Uglifier.new(harmony: true)
config.assets.js_compressor = :terser
+1
itsalongstory on Aug 16, 2022
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