HerokuでRailsアプリのデプロイエラー

前提・実現したいこと

Rails初心者です。
Ruby on Rails でWebアプリを作っています。
git push heroku master してデプロイしようとするとエラーが発生します。

発生している問題・エラーメッセージ

remote: Compressing source files... done.
remote: Building source:
remote:
remote: -----> Ruby app detected
remote: -----> Compiling Ruby/Rails
remote:
remote: ###### WARNING:
remote:

remote: Uglifier::Error: Unexpected token: name (draw). To use ES6 syntax, harmony mode must be enabled with Uglifier.new(:harmony => true).

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 ~.
remote:
To https://git.heroku.com/~.git
! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/~.git'

該当のソースコード

production
1Rails.application.configure do
2  # Settings specified here will take precedence over those in config/application.rb.
3
4  # Code is not reloaded between requests.
5  config.cache_classes = true
6
7  # Eager load code on boot. This eager loads most of Rails and
8  # your application in memory, allowing both threaded web servers
9  # and those relying on copy on write to perform better.
10  # Rake tasks automatically ignore this option for performance.
11  config.eager_load = true
12
13  # Full error reports are disabled and caching is turned on.
14  config.consider_all_requests_local       = false
15  config.action_controller.perform_caching = true
16
17  # Ensures that a master key has been made available in either ENV["RAILS_MASTER_KEY"]
18  # or in config/master.key. This key is used to decrypt credentials (and other encrypted files).
19  # config.require_master_key = true
20
21  # Disable serving static files from the `/public` folder by default since
22  # Apache or NGINX already handles this.
23  config.public_file_server.enabled = ENV['RAILS_SERVE_STATIC_FILES'].present?
24
25  # Compress JavaScripts and CSS.
26  config.assets.js_compressor = Uglifier.new(:harmony => true)
27  # config.assets.css_compressor = :sass
28
29  # Do not fallback to assets pipeline if a precompiled asset is missed.
30  config.assets.compile = true
31
32  # `config.assets.precompile` and `config.assets.version` have moved to config/initializers/assets.rb
33
34  # Enable serving of images, stylesheets, and JavaScripts from an asset server.
35  # config.action_controller.asset_host = 'http://assets.example.com'
36
37  # Specifies the header that your server uses for sending files.
38  # config.action_dispatch.x_sendfile_header = 'X-Sendfile' # for Apache
39  # config.action_dispatch.x_sendfile_header = 'X-Accel-Redirect' # for NGINX
40
41  # Store uploaded files on the local file system (see config/storage.yml for options)
42  config.active_storage.service = :local
43
44  # Mount Action Cable outside main process or domain
45  # config.action_cable.mount_path = nil
46  # config.action_cable.url = 'wss://example.com/cable'
47  # config.action_cable.allowed_request_origins = [ 'http://example.com', /http://example.*/ ]
48
49  # Force all access to the app over SSL, use Strict-Transport-Security, and use secure cookies.
50  # config.force_ssl = true
51
52  # Use the lowest log level to ensure availability of diagnostic information
53  # when problems arise.
54  config.log_level = :debug
55
56  # Prepend all log lines with the following tags.
57  config.log_tags = [ :request_id ]
58
59  # Use a different cache store in production.
60  # config.cache_store = :mem_cache_store
61
62  # Use a real queuing backend for Active Job (and separate queues per environment)
63  # config.active_job.queue_adapter     = :resque
64  # config.active_job.queue_name_prefix = "~_#{Rails.env}"
65
66  config.action_mailer.perform_caching = false
67
68  # Ignore bad email addresses and do not raise email delivery errors.
69  # Set this to true and configure the email server for immediate delivery to raise delivery errors.
70  # config.action_mailer.raise_delivery_errors = false
71
72  # Enable locale fallbacks for I18n (makes lookups for any locale fall back to
73  # the I18n.default_locale when a translation cannot be found).
74  config.i18n.fallbacks = true
75
76  # Send deprecation notices to registered listeners.
77  config.active_support.deprecation = :notify
78
79  # Use default logging formatter so that PID and timestamp are not suppressed.
80  config.log_formatter = ::Logger::Formatter.new
81
82  # Use a different logger for distributed setups.
83  # require 'syslog/logger'
84  # config.logger = ActiveSupport::TaggedLogging.new(Syslog::Logger.new 'app-name')
85
86  if ENV["RAILS_LOG_TO_STDOUT"].present?
87    logger           = ActiveSupport::Logger.new(STDOUT)
88    logger.formatter = config.log_formatter
89    config.logger    = ActiveSupport::TaggedLogging.new(logger)
90  end
91
92  # Do not dump schema after migrations.
93  config.active_record.dump_schema_after_migration = false
94end
95

試したこと

https://obel.hatenablog.jp/entry/20180530/1527672119 こちらのサイトを参考に
config/environments/production.rb の config.assets.js_compressor を
Uglifier.new(harmony: true) に書き換えましたが、エラーは消えず、次に、
Uglifier.new(:harmony => true) に書き換えましたが、変わらず。