Uglifier::Error: Unexpected token: name (newline)

[murtyk]

I have in environments/production.rb:

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

$ RAILS_ENV=production bundle exec rake assets:precompile --trace
** Invoke assets:precompile (first_time)
** Invoke assets:environment (first_time)
** Execute assets:environment
** Invoke environment (first_time)
** Execute environment
** Invoke yarn:install (first_time)
** Execute yarn:install
Yarn executable was not detected in the system.
Download Yarn at https://yarnpkg.com/en/docs/install
** Execute assets:precompile
rake aborted!
Uglifier::Error: Unexpected token: name (newline)
/usr/local/bundle/gems/uglifier-4.1.20/lib/uglifier.rb:234:in parse_result' /usr/local/bundle/gems/uglifier-4.1.20/lib/uglifier.rb:216:in run_uglifyjs'
/usr/local/bundle/gems/uglifier-4.1.20/lib/uglifier.rb:168:in compile' /usr/local/bundle/gems/sprockets-3.7.2/lib/sprockets/compressing.rb:65:in block in js_compressor='
/usr/local/bundle/gems/sprockets-3.7.2/lib/sprockets/legacy_proc_processor.rb:31:in call' /usr/local/bundle/gems/sprockets-3.7.2/lib/sprockets/processor_utils.rb:75:in call_processor'
/usr/local/bundle/gems/sprockets-3.7.2/lib/sprockets/processor_utils.rb:57:in block in call_processors' /usr/local/bundle/gems/sprockets-3.7.2/lib/sprockets/processor_utils.rb:56:in reverse_each'
/usr/local/bundle/gems/sprockets-3.7.2/lib/sprockets/processor_utils.rb:56:in call_processors' /usr/local/bundle/gems/sprockets-3.7.2/lib/sprockets/loader.rb:134:in load_from_unloaded'
/usr/local/bundle/gems/sprockets-3.7.2/lib/sprockets/loader.rb:60:in block in load' /usr/local/bundle/gems/sprockets-3.7.2/lib/sprockets/loader.rb:317:in fetch_asset_from_dependency_cache'
/usr/local/bundle/gems/sprockets-3.7.2/lib/sprockets/loader.rb:44:in load' /usr/local/bundle/gems/sprockets-3.7.2/lib/sprockets/cached_environment.rb:20:in block in initialize'
/usr/local/bundle/gems/sprockets-3.7.2/lib/sprockets/cached_environment.rb:47:in load' /usr/local/bundle/gems/sprockets-3.7.2/lib/sprockets/base.rb:66:in find_asset'
/usr/local/bundle/gems/sprockets-3.7.2/lib/sprockets/base.rb:73:in find_all_linked_assets' /usr/local/bundle/gems/sprockets-3.7.2/lib/sprockets/manifest.rb:142:in block in find'
/usr/local/bundle/gems/sprockets-3.7.2/lib/sprockets/legacy.rb:114:in block (2 levels) in logical_paths' /usr/local/bundle/gems/sprockets-3.7.2/lib/sprockets/path_utils.rb:228:in block in stat_tree'
/usr/local/bundle/gems/sprockets-3.7.2/lib/sprockets/path_utils.rb:212:in block in stat_directory' /usr/local/bundle/gems/sprockets-3.7.2/lib/sprockets/path_utils.rb:209:in each'
/usr/local/bundle/gems/sprockets-3.7.2/lib/sprockets/path_utils.rb:209:in stat_directory' /usr/local/bundle/gems/sprockets-3.7.2/lib/sprockets/path_utils.rb:227:in stat_tree'
/usr/local/bundle/gems/sprockets-3.7.2/lib/sprockets/legacy.rb:105:in each' /usr/local/bundle/gems/sprockets-3.7.2/lib/sprockets/legacy.rb:105:in block in logical_paths'
/usr/local/bundle/gems/sprockets-3.7.2/lib/sprockets/legacy.rb:104:in each' /usr/local/bundle/gems/sprockets-3.7.2/lib/sprockets/legacy.rb:104:in logical_paths'
/usr/local/bundle/gems/sprockets-3.7.2/lib/sprockets/manifest.rb:140:in find' /usr/local/bundle/gems/sprockets-3.7.2/lib/sprockets/manifest.rb:186:in compile'
/usr/local/bundle/gems/sprockets-rails-3.2.1/lib/sprockets/rails/task.rb:68:in block (3 levels) in define' /usr/local/bundle/gems/sprockets-3.7.2/lib/rake/sprocketstask.rb:147:in with_logger'
/usr/local/bundle/gems/sprockets-rails-3.2.1/lib/sprockets/rails/task.rb:67:in block (2 levels) in define' /usr/local/bundle/gems/rake-12.3.1/lib/rake/task.rb:271:in block in execute'
/usr/local/bundle/gems/rake-12.3.1/lib/rake/task.rb:271:in each' /usr/local/bundle/gems/rake-12.3.1/lib/rake/task.rb:271:in execute'
/usr/local/bundle/gems/rake-12.3.1/lib/rake/task.rb:213:in block in invoke_with_call_chain' /usr/local/lib/ruby/2.5.0/monitor.rb:226:in mon_synchronize'
/usr/local/bundle/gems/rake-12.3.1/lib/rake/task.rb:193:in invoke_with_call_chain' /usr/local/bundle/gems/rake-12.3.1/lib/rake/task.rb:182:in invoke'
/usr/local/bundle/gems/rake-12.3.1/lib/rake/application.rb:160:in invoke_task' /usr/local/bundle/gems/rake-12.3.1/lib/rake/application.rb:116:in block (2 levels) in top_level'
/usr/local/bundle/gems/rake-12.3.1/lib/rake/application.rb:116:in each' /usr/local/bundle/gems/rake-12.3.1/lib/rake/application.rb:116:in block in top_level'
/usr/local/bundle/gems/rake-12.3.1/lib/rake/application.rb:125:in run_with_threads' /usr/local/bundle/gems/rake-12.3.1/lib/rake/application.rb:110:in top_level'
/usr/local/bundle/gems/rake-12.3.1/lib/rake/application.rb:83:in block in run' /usr/local/bundle/gems/rake-12.3.1/lib/rake/application.rb:186:in standard_exception_handling'
/usr/local/bundle/gems/rake-12.3.1/lib/rake/application.rb:80:in run' /usr/local/bundle/gems/rake-12.3.1/exe/rake:27:in <top (required)>'
/usr/local/bundle/bin/rake:23:in load' /usr/local/bundle/bin/rake:23:in <top (required)>'
/usr/local/lib/ruby/gems/2.5.0/gems/bundler-1.17.1/lib/bundler/cli/exec.rb:74:in load' /usr/local/lib/ruby/gems/2.5.0/gems/bundler-1.17.1/lib/bundler/cli/exec.rb:74:in kernel_load'
/usr/local/lib/ruby/gems/2.5.0/gems/bundler-1.17.1/lib/bundler/cli/exec.rb:28:in run' /usr/local/lib/ruby/gems/2.5.0/gems/bundler-1.17.1/lib/bundler/cli.rb:463:in exec'
/usr/local/lib/ruby/gems/2.5.0/gems/bundler-1.17.1/lib/bundler/vendor/thor/lib/thor/command.rb:27:in run' /usr/local/lib/ruby/gems/2.5.0/gems/bundler-1.17.1/lib/bundler/vendor/thor/lib/thor/invocation.rb:126:in invoke_command'
/usr/local/lib/ruby/gems/2.5.0/gems/bundler-1.17.1/lib/bundler/vendor/thor/lib/thor.rb:387:in dispatch' /usr/local/lib/ruby/gems/2.5.0/gems/bundler-1.17.1/lib/bundler/cli.rb:27:in dispatch'
/usr/local/lib/ruby/gems/2.5.0/gems/bundler-1.17.1/lib/bundler/vendor/thor/lib/thor/base.rb:466:in start' /usr/local/lib/ruby/gems/2.5.0/gems/bundler-1.17.1/lib/bundler/cli.rb:18:in start'
/usr/local/lib/ruby/gems/2.5.0/gems/bundler-1.17.1/exe/bundle:30:in block in <top (required)>' /usr/local/lib/ruby/gems/2.5.0/gems/bundler-1.17.1/lib/bundler/friendly_errors.rb:124:in with_friendly_errors'
/usr/local/lib/ruby/gems/2.5.0/gems/bundler-1.17.1/exe/bundle:22:in <top (required)>' /usr/local/bin/bundle:23:in load'
/usr/local/bin/bundle:23:in `

'
Tasks: TOP => assets:precompile