Heroku: Precompiling assets failed. Push rejected, failed to compile Ruby app - ruby-on-rails

Question

I am trying on pushing and making my app live on heroku but when I tried execute git push heroku master I got the ff error:
giboapp git:master ❯ git push heroku master ⏎
Enumerating objects: 930, done.
Counting objects: 100% (930/930), done.
Delta compression using up to 2 threads
Compressing objects: 100% (645/645), done.
Writing objects: 100% (930/930), 263.37 KiB | 2.29 MiB/s, done.
Total 930 (delta 516), reused 470 (delta 255), pack-reused 0
remote: Compressing source files... done.
remote: Building source:
remote:
remote: ! Warning: Multiple default buildpacks reported the ability to handle this app. The first buildpack in the list below will be used.
remote: Detected buildpacks: Ruby,Node.js
remote: See https://devcenter.heroku.com/articles/buildpacks#buildpack-detect-order
remote: -----> Ruby app detected
remote: -----> Installing bundler 2.0.2
remote: -----> Removing BUNDLED WITH version in the Gemfile.lock
remote: -----> Compiling Ruby/Rails
remote: -----> Using Ruby version: ruby-2.6.5
remote: -----> Installing dependencies using bundler 2.0.2
remote: Running: bundle install --without development:test --path vendor/bundle --binstubs vendor/bundle/bin -j4 --deployment
remote: The dependency tzinfo-data (>= 0) will be unused by any of the platforms Bundler is installing for. Bundler is installing for ruby but the dependency is only for x86-mingw32, x86-mswin32, x64-mingw32, java. To add those platforms to the bundle, run `bundle lock --add-platform x86-mingw32 x86-mswin32 x64-mingw32 java`.
remote: Fetching gem metadata from https://rubygems.org/............
remote: Fetching rake 13.0.1
remote: Installing rake 13.0.1
remote: Fetching concurrent-ruby 1.1.6
remote: Fetching thread_safe 0.3.6
remote: Fetching minitest 5.14.1
remote: Installing minitest 5.14.1
remote: Installing thread_safe 0.3.6
remote: Installing concurrent-ruby 1.1.6
remote: Fetching builder 3.2.4
remote: Installing builder 3.2.4
remote: Fetching erubi 1.9.0
remote: Installing erubi 1.9.0
remote: Fetching mini_portile2 2.4.0
remote: Fetching crass 1.0.6
remote: Installing mini_portile2 2.4.0
remote: Installing crass 1.0.6
remote: Fetching rack 2.2.2
remote: Fetching nio4r 2.5.2
remote: Installing rack 2.2.2
remote: Installing nio4r 2.5.2 with native extensions
remote: Fetching websocket-extensions 0.1.4
remote: Installing websocket-extensions 0.1.4
remote: Fetching mini_mime 1.0.2
remote: Installing mini_mime 1.0.2
remote: Fetching arel 9.0.0
remote: Installing arel 9.0.0
remote: Fetching mimemagic 0.3.5
remote: Installing mimemagic 0.3.5
remote: Fetching execjs 2.7.0
remote: Installing execjs 2.7.0
remote: Fetching bcrypt 3.1.13
remote: Installing bcrypt 3.1.13 with native extensions
remote: Fetching msgpack 1.3.3
remote: Installing msgpack 1.3.3 with native extensions
remote: Fetching popper_js 1.16.0
remote: Installing popper_js 1.16.0
remote: Fetching method_source 1.0.0
remote: Installing method_source 1.0.0
remote: Fetching thor 1.0.1
remote: Installing thor 1.0.1
remote: Fetching ffi 1.13.0
remote: Installing ffi 1.13.0 with native extensions
remote: Fetching tilt 2.0.10
remote: Installing tilt 2.0.10
remote: Using bundler 2.0.2
remote: Fetching coffee-script-source 1.12.2
remote: Installing coffee-script-source 1.12.2
remote: Fetching orm_adapter 0.5.0
remote: Installing orm_adapter 0.5.0
remote: Fetching kaminari-core 1.2.0
remote: Installing kaminari-core 1.2.0
remote: Fetching pg 1.2.3
remote: Installing pg 1.2.3 with native extensions
remote: Fetching puma 3.12.4
remote: Installing puma 3.12.4 with native extensions
remote: Fetching rb-fsevent 0.10.4
remote: Installing rb-fsevent 0.10.4
remote: Fetching turbolinks-source 5.2.0
remote: Installing turbolinks-source 5.2.0
remote: Fetching tzinfo 1.2.7
remote: Installing tzinfo 1.2.7
remote: Fetching nokogiri 1.10.9
remote: Installing nokogiri 1.10.9 with native extensions
remote: Fetching i18n 1.8.2
remote: Installing i18n 1.8.2
remote: Fetching websocket-driver 0.7.2
remote: Installing websocket-driver 0.7.2 with native extensions
remote: Fetching rack-test 1.1.0
remote: Installing rack-test 1.1.0
remote: Fetching sprockets 3.7.2
remote: Installing sprockets 3.7.2
remote: Fetching warden 1.2.8
remote: Installing warden 1.2.8
remote: Fetching mail 2.7.1
remote: Installing mail 2.7.1
remote: Fetching marcel 0.3.3
remote: Installing marcel 0.3.3
remote: Fetching autoprefixer-rails 9.7.4
remote: Installing autoprefixer-rails 9.7.4
remote: Fetching uglifier 4.2.0
remote: Installing uglifier 4.2.0
remote: Fetching coffee-script 2.4.1
remote: Installing coffee-script 2.4.1
remote: Fetching bootsnap 1.4.6
remote: Installing bootsnap 1.4.6 with native extensions
remote: Fetching sassc 2.3.0
remote: Installing sassc 2.3.0 with native extensions
remote: Fetching rb-inotify 0.10.1
remote: Installing rb-inotify 0.10.1
remote: Fetching turbolinks 5.2.1
remote: Installing turbolinks 5.2.1
remote: Fetching activesupport 5.2.4.2
remote: Installing activesupport 5.2.4.2
remote: Fetching faker 1.9.6
remote: Installing faker 1.9.6
remote: Fetching loofah 2.5.0
remote: Installing loofah 2.5.0
remote: Fetching sass-listen 4.0.0
remote: Installing sass-listen 4.0.0
remote: Fetching rails-dom-testing 2.0.3
remote: Installing rails-dom-testing 2.0.3
remote: Fetching globalid 0.4.2
remote: Installing globalid 0.4.2
remote: Fetching activemodel 5.2.4.2
remote: Installing activemodel 5.2.4.2
remote: Fetching jbuilder 2.10.0
remote: Installing jbuilder 2.10.0
remote: Fetching pundit 1.1.0
remote: Installing pundit 1.1.0
remote: Fetching rails-html-sanitizer 1.3.0
remote: Installing rails-html-sanitizer 1.3.0
remote: Fetching sass 3.7.4
remote: Installing sass 3.7.4
remote: Fetching activejob 5.2.4.2
remote: Installing activejob 5.2.4.2
remote: Fetching activerecord 5.2.4.2
remote: Installing activerecord 5.2.4.2
remote: Fetching actionview 5.2.4.2
remote: Installing actionview 5.2.4.2
remote: Fetching actionpack 5.2.4.2
remote: Installing actionpack 5.2.4.2
remote: Fetching kaminari-actionview 1.2.0
remote: Installing kaminari-actionview 1.2.0
remote: Fetching kaminari-activerecord 1.2.0
remote: Installing kaminari-activerecord 1.2.0
remote: Fetching kaminari 1.2.0
remote: Installing kaminari 1.2.0
remote: Fetching actionmailer 5.2.4.2
remote: Fetching actioncable 5.2.4.2
remote: Installing actionmailer 5.2.4.2
remote: Installing actioncable 5.2.4.2
remote: Fetching activestorage 5.2.4.2
remote: Installing activestorage 5.2.4.2
remote: Fetching railties 5.2.4.2
remote: Installing railties 5.2.4.2
remote: Fetching sprockets-rails 3.2.1
remote: Installing sprockets-rails 3.2.1
remote: Fetching coffee-rails 4.2.2
remote: Fetching responders 3.0.0
remote: Installing coffee-rails 4.2.2
remote: Installing responders 3.0.0
remote: Fetching font-awesome-rails 4.7.0.5
remote: Fetching jquery-rails 4.3.5
remote: Installing font-awesome-rails 4.7.0.5
remote: Installing jquery-rails 4.3.5
remote: Fetching jquery-ui-rails 6.0.1
remote: Installing jquery-ui-rails 6.0.1
remote: Fetching rails 5.2.4.2
remote: Installing rails 5.2.4.2
remote: Fetching rails-ujs 0.1.0
remote: Installing rails-ujs 0.1.0
remote: Fetching sass-rails 5.1.0
remote: Installing sass-rails 5.1.0
remote: Fetching toastr-rails 1.0.3
remote: Installing toastr-rails 1.0.3
remote: Fetching devise 4.7.1
remote: Installing devise 4.7.1
remote: Fetching sassc-rails 2.1.2
remote: Installing sassc-rails 2.1.2
remote: Fetching bootstrap 4.4.1
remote: Installing bootstrap 4.4.1
remote: Bundle complete! 29 Gemfile dependencies, 81 gems now installed.
remote: Gems in the groups development and test were not installed.
remote: Bundled gems are installed into `./vendor/bundle`
remote: Post-install message from i18n:
remote:
remote: HEADS UP! i18n 1.1 changed fallbacks to exclude default locale.
remote: But that may break your application.
remote:
remote: If you are upgrading your Rails application from an older version of Rails:
remote:
remote: Please check your Rails app for 'config.i18n.fallbacks = true'.
remote: If you're using I18n (>= 1.1.0) and Rails (< 5.2.2), this should be
remote: 'config.i18n.fallbacks = [I18n.default_locale]'.
remote: If not, fallbacks will be broken in your app by I18n 1.1.x.
remote:
remote: If you are starting a NEW Rails application, you can ignore this notice.
remote:
remote: For more info see:
remote: https://github.com/svenfuchs/i18n/releases/tag/v1.1.0
remote:
remote: Post-install message from sass:
remote:
remote: Ruby Sass has reached end-of-life and should no longer be used.
remote:
remote: * If you use Sass as a command-line tool, we recommend using Dart Sass, the new
remote: primary implementation: https://sass-lang.com/install
remote:
remote: * If you use Sass as a plug-in for a Ruby web framework, we recommend using the
remote: sassc gem: https://github.com/sass/sassc-ruby#readme
remote:
remote: * For more details, please refer to the Sass blog:
remote: https://sass-lang.com/blog/posts/7828841
remote:
remote: Bundle completed (205.46s)
remote: Cleaning up the bundler cache.
remote: -----> Installing node-v10.15.3-linux-x64
remote: -----> Detecting rake tasks
remote: -----> Preparing app for Rails asset pipeline
remote: Running: rake assets:precompile
remote: Yarn executable was not detected in the system.
remote: Download Yarn at https://yarnpkg.com/en/docs/install
remote: I, [2020-06-02T04:42:57.811792 #1618] INFO -- : Writing /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/public/assets/custom-0f9c6eb8f419d40212aae1b1abd8dd92617ab9a6b297929f414ad07d06d8499c.css
remote: I, [2020-06-02T04:42:57.812515 #1618] INFO -- : Writing /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/public/assets/custom-0f9c6eb8f419d40212aae1b1abd8dd92617ab9a6b297929f414ad07d06d8499c.css.gz
remote: I, [2020-06-02T04:42:57.815816 #1618] INFO -- : Writing /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/public/assets/100x100-bb24ed89d670dafbdedc9b92250df33b1d7e1ed19a752316576b49ddc59692cd.png
remote: I, [2020-06-02T04:42:57.817712 #1618] INFO -- : Writing /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/public/assets/intro-bg-a44085e80be1f8213987eb40045db6f039e02308c0405b5f84874743f1fb2c63.png
remote: I, [2020-06-02T04:42:57.820262 #1618] INFO -- : Writing /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/public/assets/intro-img-46db85e95b37abe91c9d7356ab6d975b967b2f6da4fab28edad0106658c51b24.svg
remote: I, [2020-06-02T04:42:57.821419 #1618] INFO -- : Writing /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/public/assets/intro-img-46db85e95b37abe91c9d7356ab6d975b967b2f6da4fab28edad0106658c51b24.svg.gz
remote: I, [2020-06-02T04:42:57.824955 #1618] INFO -- : Writing /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/public/assets/list-img-e69b310f8037732ce25e835bdeff8185af501e530047c454248935496f3ed5a5.svg
remote: I, [2020-06-02T04:42:57.825201 #1618] INFO -- : Writing /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/public/assets/list-img-e69b310f8037732ce25e835bdeff8185af501e530047c454248935496f3ed5a5.svg.gz
remote: I, [2020-06-02T04:42:57.828445 #1618] INFO -- : Writing /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/public/assets/logo-e09c3450e5b47daf835806cad4de85b81c66eba28411acfc26072238016c4ab3.png
remote: I, [2020-06-02T04:42:57.831251 #1618] INFO -- : Writing /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/public/assets/testimonial-029a9f73596373572da3aa2b3bf601804ae209e0fbc6bb74e81ffcf3a4f374b9.jpg
remote: rake aborted!
remote: Uglifier::Error: Unexpected token: name (newOption). To use ES6 syntax, harmony mode must be enabled with Uglifier.new(:harmony => true).
remote: --
remote: 38072 $.ajax({
remote: 38073 url: '/categories',
remote: 38074 method: 'post',
remote: 38075 data: {
remote: 38076 category: { name: capitalizeFirstLetter($('#new-category').val()) }
remote: 38077 },
remote: 38078 success: function (category) {
remote: 38079 if (category.id != null) {
remote: => let newOption = $('<option/>')
remote: 38081 .attr('value', category.id)
remote: 38082 .attr('selected', true)
remote: 38083 .text(category.name)
remote: 38084
remote: 38085 $('#category_select').append(newOption);
remote: 38086 $('#new-category').val('');
remote: 38087 }
remote: 38088 },
remote: ==
remote: /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/vendor/bundle/ruby/2.6.0/gems/uglifier-4.2.0/lib/uglifier.rb:291:in `parse_result'
remote: /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/vendor/bundle/ruby/2.6.0/gems/uglifier-4.2.0/lib/uglifier.rb:221:in `run_uglifyjs'
remote: /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/vendor/bundle/ruby/2.6.0/gems/uglifier-4.2.0/lib/uglifier.rb:166:in `compile'
remote: /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/vendor/bundle/ruby/2.6.0/gems/sprockets-3.7.2/lib/sprockets/uglifier_compressor.rb:53:in `call'
remote: /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/vendor/bundle/ruby/2.6.0/gems/sprockets-3.7.2/lib/sprockets/uglifier_compressor.rb:28:in `call'
remote: /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/vendor/bundle/ruby/2.6.0/gems/sprockets-3.7.2/lib/sprockets/processor_utils.rb:75:in `call_processor'
remote: /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/vendor/bundle/ruby/2.6.0/gems/sprockets-3.7.2/lib/sprockets/processor_utils.rb:57:in `block in call_processors'
remote: /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/vendor/bundle/ruby/2.6.0/gems/sprockets-3.7.2/lib/sprockets/processor_utils.rb:56:in `reverse_each'
remote: /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/vendor/bundle/ruby/2.6.0/gems/sprockets-3.7.2/lib/sprockets/processor_utils.rb:56:in `call_processors'
remote: /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/vendor/bundle/ruby/2.6.0/gems/sprockets-3.7.2/lib/sprockets/loader.rb:134:in `load_from_unloaded'
remote: /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/vendor/bundle/ruby/2.6.0/gems/sprockets-3.7.2/lib/sprockets/loader.rb:60:in `block in load'
remote: /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/vendor/bundle/ruby/2.6.0/gems/sprockets-3.7.2/lib/sprockets/loader.rb:317:in `fetch_asset_from_dependency_cache'
remote: /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/vendor/bundle/ruby/2.6.0/gems/sprockets-3.7.2/lib/sprockets/loader.rb:44:in `load'
remote: /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/vendor/bundle/ruby/2.6.0/gems/sprockets-3.7.2/lib/sprockets/cached_environment.rb:20:in `block in initialize'
remote: /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/vendor/bundle/ruby/2.6.0/gems/sprockets-3.7.2/lib/sprockets/cached_environment.rb:47:in `load'
remote: /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/vendor/bundle/ruby/2.6.0/gems/sprockets-3.7.2/lib/sprockets/base.rb:66:in `find_asset'
remote: /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/vendor/bundle/ruby/2.6.0/gems/sprockets-3.7.2/lib/sprockets/base.rb:73:in `find_all_linked_assets'
remote: /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/vendor/bundle/ruby/2.6.0/gems/sprockets-3.7.2/lib/sprockets/manifest.rb:142:in `block in find'
remote: /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/vendor/bundle/ruby/2.6.0/gems/sprockets-3.7.2/lib/sprockets/legacy.rb:114:in `block (2 levels) in logical_paths'
remote: /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/vendor/bundle/ruby/2.6.0/gems/sprockets-3.7.2/lib/sprockets/path_utils.rb:228:in `block in stat_tree
remote: /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/vendor/bundle/ruby/2.6.0/gems/sprockets-3.7.2/lib/sprockets/path_utils.rb:212:in `block in stat_directory'
remote: /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/vendor/bundle/ruby/2.6.0/gems/sprockets-3.7.2/lib/sprockets/path_utils.rb:209:in `each'
remote: /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/vendor/bundle/ruby/2.6.0/gems/sprockets-3.7.2/lib/sprockets/path_utils.rb:209:in `stat_directory'
remote: /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/vendor/bundle/ruby/2.6.0/gems/sprockets-3.7.2/lib/sprockets/path_utils.rb:227:in `stat_tree'
remote: /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/vendor/bundle/ruby/2.6.0/gems/sprockets-3.7.2/lib/sprockets/legacy.rb:105:in `each'
remote: /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/vendor/bundle/ruby/2.6.0/gems/sprockets-3.7.2/lib/sprockets/legacy.rb:105:in `block in logical_paths
remote: /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/vendor/bundle/ruby/2.6.0/gems/sprockets-3.7.2/lib/sprockets/legacy.rb:104:in `each'
remote: /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/vendor/bundle/ruby/2.6.0/gems/sprockets-3.7.2/lib/sprockets/legacy.rb:104:in `logical_paths'
remote: /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/vendor/bundle/ruby/2.6.0/gems/sprockets-3.7.2/lib/sprockets/manifest.rb:140:in `find'
remote: /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/vendor/bundle/ruby/2.6.0/gems/sprockets-3.7.2/lib/sprockets/manifest.rb:186:in `compile'
remote: /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/vendor/bundle/ruby/2.6.0/gems/sprockets-rails-3.2.1/lib/sprockets/rails/task.rb:68:in `block (3 levels) in define'
remote: /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/vendor/bundle/ruby/2.6.0/gems/sprockets-3.7.2/lib/rake/sprocketstask.rb:147:in `with_logger'
remote: /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/vendor/bundle/ruby/2.6.0/gems/sprockets-rails-3.2.1/lib/sprockets/rails/task.rb:67:in `block (2 levels) in define'
remote: /tmp/build_9bbd97d889fb02756ba5cbdef84e8320/vendor/bundle/ruby/2.6.0/gems/rake-13.0.1/exe/rake:27:in `<top (required)>'
remote: Tasks: TOP => assets:precompile
remote: (See full trace by running task with --trace)
remote:
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 to giboapp.
remote:
To https://git.heroku.com/giboapp.git
! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/giboapp.git'
giboapp git:master ❯ ⏎
For the record I am using postgresql for my app.
I tried to on adding this code on my config/application.rb file:
config.assets.initialize_on_precompile = false
But still did not work after pushing again.
I also tried compiling my assets via rails precompile:assets but still no effect.
Can anyone help me on this please? I am beginner with heroku.

Answer 1

Your Heroku Log states this:
#...
remote: Uglifier::Error: Unexpected token: name (newOption). To use ES6 syntax, harmony mode must be enabled with Uglifier.new(:harmony => true).
#...
Joel_Blum mentions it already in the comments, try replacing
config.assets.js_compressor = :uglifier
with
config.assets.js_compressor = Uglifier.new(harmony: true)
in config/environments/production.rb
See https://github.com/lautis/uglifier/issues/127#issuecomment-352224986