Merge pull request #4051 from alphagov/move-from-uglifier-to-terser

Move from Uglifier to Terser

Gemfile

@@ -19,7 +19,7 @@ gem "rails-i18n"
 gem "rails_translation_manager"
 gem "slimmer"
 gem "sprockets-rails"
-gem "uglifier"
+gem "terser"
 gem "uk_postcode"
 
 group :development do

Gemfile.lock

@@ -133,7 +133,7 @@ GEM
       railties (>= 6.1)
     drb (2.2.1)
     erubi (1.12.0)
-    execjs (2.8.1)
+    execjs (2.9.1)
     expgen (0.1.1)
       parslet
     ffi (1.16.3)
@@ -678,15 +678,15 @@ GEM
       tins (~> 1.0)
     terminal-table (3.0.2)
       unicode-display_width (>= 1.1.1, < 3)
+    terser (1.2.2)
+      execjs (>= 0.3.0, < 3)
     thor (1.3.1)
     timecop (0.9.8)
     timeout (0.4.1)
     tins (1.32.1)
       sync
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
-    uglifier (4.2.0)
-      execjs (>= 0.3.0, < 3)
     uk_postcode (2.1.8)
     unicode-display_width (2.5.0)
     webmock (3.23.0)
@@ -739,8 +739,8 @@ DEPENDENCIES
   simplecov
   slimmer
   sprockets-rails
+  terser
   timecop
-  uglifier
   uk_postcode
   webmock
 

config/environments/production.rb

@@ -89,7 +89,7 @@
 
   config.assets.compress = true
   config.assets.digest = true
-  config.assets.js_compressor = :uglifier
+  config.assets.js_compressor = :terser
 
   # Specifies the header that your server uses for sending files
   config.action_dispatch.x_sendfile_header = ENV["HEROKU_APP_NAME"] ? nil : "X-Sendfile"