LoadError：无法加载此类文件--sassc

Question

运行rake assets:precompile因错误而结束。找不到为什么它仍然需要 sassc，sassc 仅在使用从 Sprockets 3.x 升级到 4.x 的指南迁移到 sprockets 4 时才在项目中：

gem 'sass-rails', '>= 5'
bundle update sass-rails sprockets

然后按照 dartsass-rails 安装文档进行操作。做过：

rails tmp:clear
rake assets:clobber
rake assets:precompile

红宝石-3.1.2

gem 'rails', '7.0.3.1'
gem 'webrick'
gem 'sprockets-rails', '~> 3.4', '>= 3.4.2'
gem 'dartsass-rails', '~> 0.4.0'
...

manifest.js 文件内容：

//= link_tree ../images
//= link application.css
//= link application.js
//
//= link_tree ../builds

错误日志：

** Invoke assets:precompile (first_time)
** Invoke assets:environment (first_time)
** Execute assets:environment
** Invoke environment (first_time)
** Execute environment
** Invoke dartsass:build (first_time)
** Invoke environment 
** Execute dartsass:build
+ /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/dartsass-rails-0.4.0/exe/darwin/sass --style\=compressed --no-source-map --load-path 

/app/assets/stylesheets --load-path 
/app/assets/builds --load-path 
/app/assets/config --load-path 
/app/assets/fonts --load-path 
/app/assets/images --load-path 
/app/assets/javascripts --load-path 
/app/assets/stylesheets --load-path 
/lib/assets/javascripts --load-path 
/lib/assets/stylesheets --load-path 
/vendor/assets/javascripts --load-path 
/vendor/assets/stylesheets --load-path 

/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/bundler/gems/flex_calendar-aae0ac1c9b3f/app/assets/javascripts --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/bundler/gems/flex_calendar-aae0ac1c9b3f/app/assets/images --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/bundler/gems/flex_calendar-aae0ac1c9b3f/app/assets/stylesheets --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/bundler/gems/flex_calendar-aae0ac1c9b3f/lib/assets/javascripts --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/flatpickr-4.5.7.0/vendor/assets/javascripts --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/bundler/gems/flex_calendar-aae0ac1c9b3f/vendor/assets/javascripts --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/flatpickr-4.5.7.0/vendor/assets/stylesheets --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/tinymce-rails-5.10.5/app/assets/javascripts --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/tinymce-rails-5.10.5/app/assets/source --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/tinymce-rails-5.10.5/vendor/assets/config --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/jquery-minicolors-rails-2.2.6.2/vendor/assets/javascripts --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/tinymce-rails-5.10.5/vendor/assets/javascripts --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/jquery-minicolors-rails-2.2.6.2/vendor/assets/stylesheets --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/select2-rails-4.0.13/vendor/assets/javascripts --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/select2-rails-4.0.13/vendor/assets/stylesheets --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/jquery-ui-rails-5.0.5/app/assets/images --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/jquery-ui-rails-5.0.5/app/assets/javascripts --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/jquery-ui-rails-5.0.5/app/assets/stylesheets --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/jquery-rails-4.2.1/vendor/assets/javascripts --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/coffee-rails-5.0.0/lib/assets/javascripts --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/actiontext-7.0.3.1/app/assets/javascripts --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/actiontext-7.0.3.1/app/assets/stylesheets --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/actioncable-7.0.3.1/app/assets/javascripts --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/activestorage-7.0.3.1/app/assets/javascripts --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/actionview-7.0.3.1/lib/assets/compiled --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/react-rails-1.9.0/lib/assets/react-source/development --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/react-rails-1.9.0/lib/assets/javascripts/ --load-path 
/app/assets/fonts 
/app/assets/stylesheets/application.scss:
/app/assets/builds/application.css
  ** Execute assets:precompile
  rake aborted!
  LoadError: cannot load such file -- sassc
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/zeitwerk-2.6.0/lib/zeitwerk/kernel.rb:35:in `require'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/zeitwerk-2.6.0/lib/zeitwerk/kernel.rb:35:in `require'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/autoload/sassc.rb:2:in `<top (required)>'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/zeitwerk-2.6.0/lib/zeitwerk/kernel.rb:35:in `require'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/zeitwerk-2.6.0/lib/zeitwerk/kernel.rb:35:in `require'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/sassc_processor.rb:42:in `initialize'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/sassc_processor.rb:27:in `new'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/sassc_processor.rb:27:in `instance'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/sassc_processor.rb:31:in `call'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/processor_utils.rb:84:in `call_processor'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/processor_utils.rb:66:in `block in call_processors'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/processor_utils.rb:65:in `reverse_each'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/processor_utils.rb:65:in `call_processors'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/processor_utils.rb:22:in `block in <class:CompositeProcessor>'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/processor_utils.rb:33:in `call'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/processor_utils.rb:84:in `call_processor'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/processor_utils.rb:66:in `block in call_processors'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/processor_utils.rb:65:in `reverse_each'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/processor_utils.rb:65:in `call_processors'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/loader.rb:182:in `load_from_unloaded'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/loader.rb:59:in `block in load'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/loader.rb:337:in `fetch_asset_from_dependency_cache'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/loader.rb:43:in `load'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/cached_environment.rb:44:in `block in load'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/cached_environment.rb:44:in `fetch'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/cached_environment.rb:44:in `load'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/bundle.rb:27:in `call'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/processor_utils.rb:84:in `call_processor'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/processor_utils.rb:66:in `block in call_processors'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/processor_utils.rb:65:in `reverse_each'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/processor_utils.rb:65:in `call_processors'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/loader.rb:182:in `load_from_unloaded'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/loader.rb:59:in `block in load'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/loader.rb:337:in `fetch_asset_from_dependency_cache'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/loader.rb:43:in `load'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/cached_environment.rb:44:in `block in load'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/cached_environment.rb:44:in `fetch'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/cached_environment.rb:44:in `load'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/base.rb:81:in `find_asset'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/base.rb:88:in `find_all_linked_assets'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/manifest.rb:125:in `each'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/manifest.rb:125:in `to_a'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/manifest.rb:125:in `block (2 levels) in find'
 /.rbenv/versions/3.1.2/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'
 /.rbenv/versions/3.1.2/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'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/concurrent-ruby-1.1.10/lib/concurrent-ruby/concurrent/synchronization/mutex_lockable_object.rb:47:in `synchronize'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/concurrent-ruby-1.1.10/lib/concurrent-ruby/concurrent/synchronization/mutex_lockable_object.rb:47:in `synchronize'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/concurrent-ruby-1.1.10/lib/concurrent-ruby/concurrent/executor/safe_task_executor.rb:22:in `execute'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/concurrent-ruby-1.1.10/lib/concurrent-ruby/concurrent/promise.rb:564:in `block in realize'
 /.rbenv/versions/3.1.2/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'
 /.rbenv/versions/3.1.2/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'
 /.rbenv/versions/3.1.2/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'
 /.rbenv/versions/3.1.2/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'
 /.rbenv/versions/3.1.2/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'
 /.rbenv/versions/3.1.2/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

操作系统: mac

当我安装依赖于 sassc-rails （例如pdfjs_viewer-rails）的 gem 并使用 启动服务器./bin/dev 时，网络启动并正常工作。

问题：知道这可能是什么原因以及可能的解决方案吗？

Answer 1

我通过运行rails tmp:clear并重新启动服务器来修复它；我没有在我的 asset.rb 文件中包含任何文件，当我运行时，这种情况也开始发生在我身上：

$ rails importmap:install
$ rails turbo:install stimulus:install

Answer 2

# Use Sass to process CSS
gem "sassc-rails"

他们在 7.0.8 之后默认删除了 sassc 支持！

Answer 3

发现问题：由于样式表根文件夹下有额外example.scss文件，并且它被设置为预编译：

Rails.application.config.assets.precompile += %w( example.css )

显示此错误是因为文件实际上具有不同的扩展名。

解决方案：

1. 从预编译中取出example.css；
2. 添加了 dartsass 文件来处理它：

Rails.application.config.dartsass.builds = {
      "application.scss"    => "application.css",
      "example.scss"        => "example.css"
    }