Merge pull request #239 from hathitrust/swap_terser_for_uglifier

Replace Uglifier with Terser for Bootstrap 5/ES6 compatibility.

Gemfile

@@ -23,8 +23,8 @@ gem "rails", "~> 6.1.7.9"
 gem "puma", "~> 5.6"
 # Use SCSS/SASS for stylesheets
 gem "sassc-rails"
-# Use Uglifier as compressor for JavaScript assets
-gem "uglifier", ">= 1.3.0"
+# Use Terser as compressor for JavaScript assets, previously used Uglifier
+gem "terser"
 # See https://github.com/rails/execjs#readme for more supported runtimes
 # gem 'mini_racer', platforms: :ruby
 

Gemfile.lock

@@ -352,6 +352,8 @@ GEM
       rubocop-performance (= 1.14.3)
     terminal-table (3.0.2)
       unicode-display_width (>= 1.1.1, < 3)
+    terser (1.2.4)
+      execjs (>= 0.3.0, < 3)
     thor (1.3.1)
     tilt (2.0.11)
     timeout (0.4.1)
@@ -360,8 +362,6 @@ GEM
     turbolinks-source (5.2.0)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
-    uglifier (4.2.0)
-      execjs (>= 0.3.0, < 3)
     unf (0.1.4)
       unf_ext
     unf_ext (0.0.8.2)
@@ -438,9 +438,9 @@ DEPENDENCIES
   simplecov-lcov
   sqlite3
   standard
+  terser
   turbolinks (~> 5)
   tzinfo-data
-  uglifier (>= 1.3.0)
   w3c_validators
   web-console (>= 3.3.0)
   whois

config/environments/production.rb

@@ -23,7 +23,7 @@
   config.public_file_server.enabled = ENV["RAILS_SERVE_STATIC_FILES"].present?
 
   # Compress JavaScripts and CSS.
-  config.assets.js_compressor = :uglifier
+  config.assets.js_compressor = :terser
   # config.assets.css_compressor = :sass
 
   # Do not fallback to assets pipeline if a precompiled asset is missed.