推送到 Heroku 时遇到以下错误。前几天工作正常。我尝试推送的提交没有重大配置更改。我很困惑如何解决这个问题。Rails 5.1 应用程序使用以下构建包：
1. heroku/nodejs
2. heroku/ruby
我正在使用 webpacker 和纱线。我认为这与它有关，但难以挖掘更多信息。
remote: -----> Preparing app for Rails asset pipeline
remote: Running: rake assets:precompile
remote: yarn install v0.27.5
remote: [1/4] Resolving packages...
remote: [2/4] Fetching packages...
remote: warning fsevents@1.1.2: The platform "linux" is incompatible with this module.
remote: info "fsevents@1.1.2" is an optional dependency and failed compatibility check. Excluding it from installation.
remote: [3/4] Linking dependencies...
remote: [4/4] Building fresh packages...
remote: Done in 6.62s.
remote: rake aborted!
remote: ExecJS::RuntimeError: SyntaxError: Name expected
remote: JS_Parse_Error.get ((execjs):3538:621)
remote: (execjs):4060:47
remote: (execjs):1:102
remote: Object.<anonymous> ((execjs):1:120)
remote: Module._compile (module.js:571:32)
remote: Object.Module._extensions..js (module.js:580:10)
remote: Module.load (module.js:488:32)
remote: tryModuleLoad (module.js:447:12)
remote: Function.Module._load (module.js:439:3)
remote: Module.runMain (module.js:605:10)
remote: /tmp/build_d7b1075d17c0c421422ebdbfc017919a/vendor/bundle/ruby/2.4.0/gems/execjs-2.7.0/lib/execjs/external_runtime.rb:39:in `exec'
remote: /tmp/build_d7b1075d17c0c421422ebdbfc017919a/vendor/bundle/ruby/2.4.0/gems/execjs-2.7.0/lib/execjs/external_runtime.rb:21:in `eval'
remote: /tmp/build_d7b1075d17c0c421422ebdbfc017919a/vendor/bundle/ruby/2.4.0/gems/execjs-2.7.0/lib/execjs/external_runtime.rb:46:in `call'
remote: /tmp/build_d7b1075d17c0c421422ebdbfc017919a/vendor/bundle/ruby/2.4.0/gems/uglifier-3.2.0/lib/uglifier.rb:195:in `run_uglifyjs'
remote: /tmp/build_d7b1075d17c0c421422ebdbfc017919a/vendor/bundle/ruby/2.4.0/gems/uglifier-3.2.0/lib/uglifier.rb:157:in `compile'
remote: /tmp/build_d7b1075d17c0c421422ebdbfc017919a/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.1/lib/sprockets/uglifier_compressor.rb:53:in `call'
remote: /tmp/build_d7b1075d17c0c421422ebdbfc017919a/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.1/lib/sprockets/uglifier_compressor.rb:28:in `call'
remote: /tmp/build_d7b1075d17c0c421422ebdbfc017919a/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.1/lib/sprockets/processor_utils.rb:75:in `call_processor'
remote: /tmp/build_d7b1075d17c0c421422ebdbfc017919a/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.1/lib/sprockets/processor_utils.rb:57:in `block in call_processors'
remote: /tmp/build_d7b1075d17c0c421422ebdbfc017919a/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.1/lib/sprockets/processor_utils.rb:56:in `reverse_each'
remote: /tmp/build_d7b1075d17c0c421422ebdbfc017919a/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.1/lib/sprockets/processor_utils.rb:56:in `call_processors'
remote: /tmp/build_d7b1075d17c0c421422ebdbfc017919a/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.1/lib/sprockets/loader.rb:134:in `load_from_unloaded'
remote: /tmp/build_d7b1075d17c0c421422ebdbfc017919a/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.1/lib/sprockets/loader.rb:60:in `block in load'
remote: /tmp/build_d7b1075d17c0c421422ebdbfc017919a/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.1/lib/sprockets/loader.rb:317:in `fetch_asset_from_dependency_cache'
remote: /tmp/build_d7b1075d17c0c421422ebdbfc017919a/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.1/lib/sprockets/loader.rb:44:in `load'
remote: /tmp/build_d7b1075d17c0c421422ebdbfc017919a/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.1/lib/sprockets/cached_environment.rb:20:in `block in initialize'
remote: /tmp/build_d7b1075d17c0c421422ebdbfc017919a/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.1/lib/sprockets/cached_environment.rb:47:in `load'
remote: /tmp/build_d7b1075d17c0c421422ebdbfc017919a/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.1/lib/sprockets/base.rb:66:in `find_asset'
remote: /tmp/build_d7b1075d17c0c421422ebdbfc017919a/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.1/lib/sprockets/base.rb:73:in `find_all_linked_assets'
remote: /tmp/build_d7b1075d17c0c421422ebdbfc017919a/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.1/lib/sprockets/manifest.rb:142:in `block in find'
remote: /tmp/build_d7b1075d17c0c421422ebdbfc017919a/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.1/lib/sprockets/legacy.rb:114:in `block (2 levels) in logical_paths'
remote: /tmp/build_d7b1075d17c0c421422ebdbfc017919a/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.1/lib/sprockets/path_utils.rb:228:in `block in stat_tree'
remote: /tmp/build_d7b1075d17c0c421422ebdbfc017919a/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.1/lib/sprockets/path_utils.rb:212:in `block in stat_directory'
remote: /tmp/build_d7b1075d17c0c421422ebdbfc017919a/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.1/lib/sprockets/path_utils.rb:209:in `each'
remote: /tmp/build_d7b1075d17c0c421422ebdbfc017919a/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.1/lib/sprockets/path_utils.rb:209:in `stat_directory'
remote: /tmp/build_d7b1075d17c0c421422ebdbfc017919a/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.1/lib/sprockets/path_utils.rb:227:in `stat_tree'
remote: /tmp/build_d7b1075d17c0c421422ebdbfc017919a/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.1/lib/sprockets/legacy.rb:105:in `each'
remote: /tmp/build_d7b1075d17c0c421422ebdbfc017919a/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.1/lib/sprockets/legacy.rb:105:in `block in logical_paths'
remote: /tmp/build_d7b1075d17c0c421422ebdbfc017919a/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.1/lib/sprockets/legacy.rb:104:in `each'
remote: /tmp/build_d7b1075d17c0c421422ebdbfc017919a/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.1/lib/sprockets/legacy.rb:104:in `logical_paths'
remote: /tmp/build_d7b1075d17c0c421422ebdbfc017919a/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.1/lib/sprockets/manifest.rb:140:in `find'
remote: /tmp/build_d7b1075d17c0c421422ebdbfc017919a/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.1/lib/sprockets/manifest.rb:185:in `compile'
remote: /tmp/build_d7b1075d17c0c421422ebdbfc017919a/vendor/bundle/ruby/2.4.0/gems/sprockets-rails-3.2.0/lib/sprockets/rails/task.rb:68:in `block (3 levels) in define'
remote: /tmp/build_d7b1075d17c0c421422ebdbfc017919a/vendor/bundle/ruby/2.4.0/gems/sprockets-3.7.1/lib/rake/sprocketstask.rb:147:in `with_logger'
remote: /tmp/build_d7b1075d17c0c421422ebdbfc017919a/vendor/bundle/ruby/2.4.0/gems/sprockets-rails-3.2.0/lib/sprockets/rails/task.rb:67:in `block (2 levels) in define'
remote: /tmp/build_d7b1075d17c0c421422ebdbfc017919a/vendor/bundle/ruby/2.4.0/gems/rake-12.0.0/exe/rake:27:in `<top (required)>'
remote: Tasks: TOP => assets:precompile
remote: (See full trace by running task with --trace)
remote: !
remote: ! Precompiling assets failed.
remote: !
remote: ! Push rejected, failed to compile Ruby app.
remote:
remote: ! Push failed
remote: Verifying deploy...
remote:
remote: ! Push rejected ....
经过进一步研究，发现问题与Uglifier有关。当我将第三方库 datepicker.js 的内容复制并粘贴到 Uglifier 中时，我得到了同样的错误：
> Uglifier.compile( <<< file contents >>> )
ExecJS::RuntimeError: SyntaxError: Name expected
from JS_Parse_Error.get ((execjs):3538:621)