每当我跑步时rake assets:precompile RAILS_ENV=production在我的命令行中，我收到此错误，它阻止我预编译我的资产。
以下是命令行中显示的完整错误：
rake aborted!
Uglifier::Error: Unexpected token: operator (<)
/usr/local/rvm/gems/ruby-2.3.4/gems/uglifier-4.1.4/lib/uglifier.rb:234:in parse_result'
/usr/local/rvm/gems/ruby-2.3.4/gems/uglifier-4.1.4/lib/uglifier.rb:216:in run_uglifyjs'
/usr/local/rvm/gems/ruby-2.3.4/gems/uglifier-4.1.4/lib/uglifier.rb:168:in compile'
/usr/local/rvm/gems/ruby-2.3.4/gems/sprockets-3.7.1/lib/sprockets/compressing.rb:65:in block in js_compressor='
/usr/local/rvm/gems/ruby-2.3.4/gems/sprockets-3.7.1/lib/sprockets/legacy_proc_processor.rb:31:in call'
/usr/local/rvm/gems/ruby-2.3.4/gems/sprockets-3.7.1/lib/sprockets/processor_utils.rb:75:in call_processor'
/usr/local/rvm/gems/ruby-2.3.4/gems/sprockets-3.7.1/lib/sprockets/processor_utils.rb:57:in block in call_processors'
/usr/local/rvm/gems/ruby-2.3.4/gems/sprockets-3.7.1/lib/sprockets/processor_utils.rb:56:in reverse_each'
/usr/local/rvm/gems/ruby-2.3.4/gems/sprockets-3.7.1/lib/sprockets/processor_utils.rb:56:in call_processors'
/usr/local/rvm/gems/ruby-2.3.4/gems/sprockets-3.7.1/lib/sprockets/loader.rb:134:in load_from_unloaded'
/usr/local/rvm/gems/ruby-2.3.4/gems/sprockets-3.7.1/lib/sprockets/loader.rb:60:in block in load'
/usr/local/rvm/gems/ruby-2.3.4/gems/sprockets-3.7.1/lib/sprockets/loader.rb:317:in fetch_asset_from_dependency_cache'
/usr/local/rvm/gems/ruby-2.3.4/gems/sprockets-3.7.1/lib/sprockets/loader.rb:44:in load'
/usr/local/rvm/gems/ruby-2.3.4/gems/sprockets-3.7.1/lib/sprockets/cached_environment.rb:20:in block in initialize'
/usr/local/rvm/gems/ruby-2.3.4/gems/sprockets-3.7.1/lib/sprockets/cached_environment.rb:47:in load'
/usr/local/rvm/gems/ruby-2.3.4/gems/sprockets-3.7.1/lib/sprockets/base.rb:66:in find_asset'
/usr/local/rvm/gems/ruby-2.3.4/gems/sprockets-3.7.1/lib/sprockets/base.rb:73:in find_all_linked_assets'
/usr/local/rvm/gems/ruby-2.3.4/gems/sprockets-3.7.1/lib/sprockets/manifest.rb:142:in block in find'
/usr/local/rvm/gems/ruby-2.3.4/gems/sprockets-3.7.1/lib/sprockets/legacy.rb:114:in block (2 levels) in logical_paths'
/usr/local/rvm/gems/ruby-2.3.4/gems/sprockets-3.7.1/lib/sprockets/path_utils.rb:228:in block in stat_tree'
/usr/local/rvm/gems/ruby-2.3.4/gems/sprockets-3.7.1/lib/sprockets/path_utils.rb:212:in block in stat_directory'
/usr/local/rvm/gems/ruby-2.3.4/gems/sprockets-3.7.1/lib/sprockets/path_utils.rb:209:in each'
/usr/local/rvm/gems/ruby-2.3.4/gems/sprockets-3.7.1/lib/sprockets/path_utils.rb:209:in stat_directory'
/usr/local/rvm/gems/ruby-2.3.4/gems/sprockets-3.7.1/lib/sprockets/path_utils.rb:227:in stat_tree'
/usr/local/rvm/gems/ruby-2.3.4/gems/sprockets-3.7.1/lib/sprockets/legacy.rb:105:in each'
/usr/local/rvm/gems/ruby-2.3.4/gems/sprockets-3.7.1/lib/sprockets/legacy.rb:105:in block in logical_paths'
/usr/local/rvm/gems/ruby-2.3.4/gems/sprockets-3.7.1/lib/sprockets/legacy.rb:104:in each'
/usr/local/rvm/gems/ruby-2.3.4/gems/sprockets-3.7.1/lib/sprockets/legacy.rb:104:in logical_paths'
/usr/local/rvm/gems/ruby-2.3.4/gems/sprockets-3.7.1/lib/sprockets/manifest.rb:140:in find'
/usr/local/rvm/gems/ruby-2.3.4/gems/sprockets-3.7.1/lib/sprockets/manifest.rb:185:in compile'
/usr/local/rvm/gems/ruby-2.3.4/gems/sprockets-rails-3.2.1/lib/sprockets/rails/task.rb:68:in block (3 levels) in define'
/usr/local/rvm/gems/ruby-2.3.4/gems/sprockets-3.7.1/lib/rake/sprocketstask.rb:147:in with_logger'
/usr/local/rvm/gems/ruby-2.3.4/gems/sprockets-rails-3.2.1/lib/sprockets/rails/task.rb:67:in block (2 levels) in define'
/usr/local/rvm/gems/ruby-2.3.4/gems/rake-12.3.0/exe/rake:27:in <top (required)>'
/usr/local/rvm/gems/ruby-2.3.4/bin/ruby_executable_hooks:15:in eval'
/usr/local/rvm/gems/ruby-2.3.4/bin/ruby_executable_hooks:15:in <main>'
Tasks: TOP => assets:precompile
(See full trace by running task with --trace)
我到底需要做什么来修复这个错误？
我遇到了同样的错误。有趣的是，它是由直接上传.js https://edgeguides.rubyonrails.org/active_storage_overview.html#direct-upload-javascript-eventsRails 本身推荐用于 ActiveStorage 的文件！我在这里找到了解决方案：https://github.com/lautis/uglifier/issues/127 https://github.com/lautis/uglifier/issues/127
尝试更换
config.assets.js_compressor = :uglifier
with
config.assets.js_compressor = Uglifier.new(harmony: true)
in config/environments/production.rb
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