When trying to deploy a rails 5 app to heroku, I get the following error, when it reaches Running: rake assets:precompile:
remote: ExecJS::ProgramError: SyntaxError: Unexpected token: name (autoRegisterNamespace) (line: 14767, col: 7, pos: 457487)
remote: Error
remote: at new JS_Parse_Error (<eval>:3623:11948)
remote: at js_error (<eval>:3623:12167)
remote: at croak (<eval>:3623:21858)
remote: at token_error (<eval>:3623:21995)
remote: at unexpected (<eval>:3623:22083)
remote: at semicolon (<eval>:3623:22601)
remote: at simple_statement (<eval>:3623:25779)
remote: at <eval>:3623:23567
remote: at <eval>:3623:22774
remote: at block_ (<eval>:3623:27903)
remote: at <eval>:3623:23677
remote: at <eval>:3623:22774
remote: new JS_Parse_Error ((execjs):3623:11948)
remote: js_error ((execjs):3623:12167)
remote: croak ((execjs):3623:21858)
remote: token_error ((execjs):3623:21995)
remote: unexpected ((execjs):3623:22083)
remote: semicolon ((execjs):3623:22601)
remote: simple_statement ((execjs):3623:25779)
remote: (execjs):3623:23567
remote: (execjs):3623:22774
remote: block_ ((execjs):3623:27903)
remote: (execjs):3623:23677
remote: (execjs):3623:22774
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/execjs-2.7.0/lib/execjs/ruby_racer_runtime.rb:47:in `rescue in block in call'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/execjs-2.7.0/lib/execjs/ruby_racer_runtime.rb:44:in `block in call'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/execjs-2.7.0/lib/execjs/ruby_racer_runtime.rb:75:in `block in lock'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/execjs-2.7.0/lib/execjs/ruby_racer_runtime.rb:73:in `call'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/execjs-2.7.0/lib/execjs/ruby_racer_runtime.rb:73:in `Locker'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/execjs-2.7.0/lib/execjs/ruby_racer_runtime.rb:73:in `lock'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/execjs-2.7.0/lib/execjs/ruby_racer_runtime.rb:43:in `call'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/uglifier-3.0.1/lib/uglifier.rb:179:in `run_uglifyjs'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/uglifier-3.0.1/lib/uglifier.rb:141:in `compile'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/uglifier_compressor.rb:52:in `call'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/uglifier_compressor.rb:28:in `call'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/processor_utils.rb:75:in `call_processor'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/processor_utils.rb:57:in `block in call_processors'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/processor_utils.rb:56:in `reverse_each'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/processor_utils.rb:56:in `call_processors'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/loader.rb:134:in `load_from_unloaded'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/loader.rb:60:in `block in load'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/loader.rb:317:in `fetch_asset_from_dependency_cache'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/loader.rb:44:in `load'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/cached_environment.rb:20:in `block in initialize'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/cached_environment.rb:47:in `yield'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/cached_environment.rb:47:in `load'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/base.rb:66:in `find_asset'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/base.rb:73:in `find_all_linked_assets'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/manifest.rb:142:in `block in find'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/legacy.rb:114:in `block (2 levels) in logical_paths'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/path_utils.rb:228:in `block in stat_tree'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/path_utils.rb:212:in `block in stat_directory'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/path_utils.rb:209:in `each'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/path_utils.rb:209:in `stat_directory'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/path_utils.rb:227:in `stat_tree'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/legacy.rb:105:in `each'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/legacy.rb:105:in `block in logical_paths'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/legacy.rb:104:in `each'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/legacy.rb:104:in `logical_paths'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/manifest.rb:140:in `find'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/manifest.rb:185:in `compile'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-3.1.1/lib/sprockets/rails/task.rb:68:in `block (3 levels) in define'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/rake/sprocketstask.rb:147:in `with_logger'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-3.1.1/lib/sprockets/rails/task.rb:67:in `block (2 levels) in define'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/rake-11.2.2/exe/rake:27:in `<top (required)>'
remote: V8::Error: SyntaxError: Unexpected token: name (autoRegisterNamespace)
remote: at js_error (<eval>:3623:12167)
remote: at croak (<eval>:3623:21858)
remote: at token_error (<eval>:3623:21995)
remote: at unexpected (<eval>:3623:22083)
remote: at semicolon (<eval>:3623:22601)
remote: at simple_statement (<eval>:3623:25779)
remote: at <eval>:3623:23567
remote: at <eval>:3623:22774
remote: at block_ (<eval>:3623:27903)
remote: at <eval>:3623:23677
remote: at <eval>:3623:22774
remote: at if_ (<eval>:3623:27671)
remote: at <eval>:3623:24326
remote: at <eval>:3623:22774
remote: at block_ (<eval>:3623:27903)
remote: at ctor.body (<eval>:3623:27506)
remote: at function_ (<eval>:3623:27602)
remote: at expr_atom (<eval>:3623:30888)
remote: at maybe_unary (<eval>:3624:1562)
remote: at expr_ops (<eval>:3624:2333)
remote: at maybe_conditional (<eval>:3624:2425)
remote: at maybe_assign (<eval>:3624:2868)
remote: at expression (<eval>:3624:3194)
remote: at expr_atom (<eval>:3623:30640)
remote: at maybe_unary (<eval>:3624:1562)
remote: at expr_ops (<eval>:3624:2333)
remote: at maybe_conditional (<eval>:3624:2425)
remote: at maybe_assign (<eval>:3624:2868)
remote: at expression (<eval>:3624:3194)
remote: at simple_statement (<eval>:3623:25762)
remote: at <eval>:3623:23722
remote: at <eval>:3623:22774
remote: at block_ (<eval>:3623:27903)
remote: at ctor.body (<eval>:3623:27506)
remote: at function_ (<eval>:3623:27602)
remote: at expr_atom (<eval>:3623:30888)
remote: at maybe_unary (<eval>:3624:1562)
remote: at expr_ops (<eval>:3624:2333)
remote: at maybe_conditional (<eval>:3624:2425)
remote: at maybe_assign (<eval>:3624:2868)
remote: at expression (<eval>:3624:3194)
remote: at expr_list (<eval>:3623:31368)
remote: at subscripts (<eval>:3624:1271)
remote: at expr_atom (<eval>:3623:30952)
remote: at maybe_unary (<eval>:3624:1562)
remote: at expr_ops (<eval>:3624:2333)
remote: at maybe_conditional (<eval>:3624:2425)
remote: at maybe_assign (<eval>:3624:2868)
remote: at expression (<eval>:3624:3194)
remote: at expr_atom (<eval>:3623:30640)
remote: at maybe_unary (<eval>:3624:1562)
remote: at expr_ops (<eval>:3624:2333)
remote: at maybe_conditional (<eval>:3624:2425)
remote: at maybe_assign (<eval>:3624:2868)
remote: at expression (<eval>:3624:3194)
remote: at simple_statement (<eval>:3623:25762)
remote: at <eval>:3623:23722
remote: at <eval>:3623:22774
remote: at <eval>:3624:3569
remote: at parse (<eval>:3624:3809)
remote: at parse (<eval>:3958:22)
remote: at uglifier (<eval>:4001:13)
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/execjs-2.7.0/lib/execjs/ruby_racer_runtime.rb:45:in `block in call'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/execjs-2.7.0/lib/execjs/ruby_racer_runtime.rb:75:in `block in lock'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/execjs-2.7.0/lib/execjs/ruby_racer_runtime.rb:73:in `call'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/execjs-2.7.0/lib/execjs/ruby_racer_runtime.rb:73:in `Locker'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/execjs-2.7.0/lib/execjs/ruby_racer_runtime.rb:73:in `lock'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/execjs-2.7.0/lib/execjs/ruby_racer_runtime.rb:43:in `call'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/uglifier-3.0.1/lib/uglifier.rb:179:in `run_uglifyjs'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/uglifier-3.0.1/lib/uglifier.rb:141:in `compile'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/uglifier_compressor.rb:52:in `call'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/uglifier_compressor.rb:28:in `call'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/processor_utils.rb:75:in `call_processor'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/processor_utils.rb:57:in `block in call_processors'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/processor_utils.rb:56:in `reverse_each'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/processor_utils.rb:56:in `call_processors'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/loader.rb:134:in `load_from_unloaded'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/loader.rb:60:in `block in load'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/loader.rb:317:in `fetch_asset_from_dependency_cache'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/loader.rb:44:in `load'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/cached_environment.rb:20:in `block in initialize'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/cached_environment.rb:47:in `yield'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/cached_environment.rb:47:in `load'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/base.rb:66:in `find_asset'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/base.rb:73:in `find_all_linked_assets'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/manifest.rb:142:in `block in find'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/legacy.rb:114:in `block (2 levels) in logical_paths'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/path_utils.rb:228:in `block in stat_tree'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/path_utils.rb:212:in `block in stat_directory'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/path_utils.rb:209:in `each'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/path_utils.rb:209:in `stat_directory'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/path_utils.rb:227:in `stat_tree'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/legacy.rb:105:in `each'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/legacy.rb:105:in `block in logical_paths'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/legacy.rb:104:in `each'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/legacy.rb:104:in `logical_paths'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/manifest.rb:140:in `find'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/sprockets/manifest.rb:185:in `compile'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-3.1.1/lib/sprockets/rails/task.rb:68:in `block (3 levels) in define'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-3.7.0/lib/rake/sprocketstask.rb:147:in `with_logger'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/sprockets-rails-3.1.1/lib/sprockets/rails/task.rb:67:in `block (2 levels) in define'
remote: /tmp/build_371be96e0ec063bb6c90d7770da64944/vendor/bundle/ruby/2.2.0/gems/rake-11.2.2/exe/rake:27:in `<top (required)>'
remote: Tasks: TOP => assets:precompile
remote: (See full trace by running task with --trace)
My Gemfile looks like this:
source 'https://rubygems.org'
gem 'rails', '~> 5.0.0'
gem 'pg'
gem 'puma', '~> 3.0'
gem 'httparty', '~> 0.14.0'
gem 'sass-rails', '~> 5.0'
gem 'uglifier', '>= 1.3.0'
gem 'coffee-rails', '~> 4.2'
gem 'jquery-rails', '~> 4.1', '>= 4.1.1'
gem 'haml-rails', '~> 0.9.0'
gem 'bootstrap-sass', '~> 3.3', '>= 3.3.7'
gem 'owlcarousel-rails', '~> 1.1', '>= 1.1.3.3'
gem 'font-awesome-rails', '~> 4.6', '>= 4.6.3.1'
gem 'turbolinks', '~> 5'
gem 'jbuilder', '~> 2.5'
# Use Redis adapter to run Action Cable in production
# gem 'redis', '~> 3.0'
gem 'therubyracer'
gem 'execjs'
group :development, :test do
gem 'byebug', platform: :mri
end
group :development do
gem 'web-console'
gem 'listen', '~> 3.0.5'
gem 'spring'
gem 'spring-watcher-listen', '~> 2.0.0'
end
gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
I tried both with and without:
gem 'therubyracer'
gem 'execjs'
Nothing helps. Running rake assets:precompile locally on my mac works...
It may have something to do with javascript/coffescript syntax. Check if you have let, it shout be replaced with var.
Edit - see @Guilherme Lages Santos's response. Uglifier added ES6 support since version 3.2.0 so you can just use it like this in your environment file
config.assets.js_compressor = Uglifier.new(harmony: true)
As the Uglifier official documentation says (https://github.com/lautis/uglifier):
"The experimental ES6 syntax support can be enabled by passing :harmony => true option to Uglifier."
Uglifier.compile(js, harmony: true)
So replace in config/environments/production.rb.
config.assets.js_compressor = :uglifier
with
config.assets.js_compressor = Uglifier.new(harmony: true)
I also had this issue.
It's important to remember that by default Heroku is precompiling in a production environment. When you run rake assets:precompile locally it's typically a development environment, which for me didn't exhibit the issue.
So in order to reproduce the issue locally, try
RAILS_ENV=production rake assets:precompile --trace
In my case I am using angularjs-rails gem and some how used es6 standard so solve it by commenting uglifier compressor in file config/environments/production.rb.
#config.assets.js_compressor = :uglifier
Seems to be some issues with newer ES syntax. Backtick's also won't pre-compile.
my example:
http://localhost:3000//${bike_file}.html
I changed to
"http://localhost:3000//" + bike_file + ".html"
I had this issue and it was throwing Uglifier::Error: Unexpected token: name (subscription)
It ended up being an actual syntax error.
I accidentally had left the words "cancel subscription" in one of my JS files and it was causing it to throw that error
来源：https://stackoverflow.com/questions/39221152/rails-5-heroku-deploy-error-execjsprogramerror-syntaxerror-unexpected-token