rails71: uglifier を terser-ruby に置き換える

アセットプリコンパイル時に JavaScript のコンパイルができなくなっていたため

Gemfile

@@ -26,8 +26,8 @@ gem 'activerecord-import'
 
 # Use SCSS for stylesheets
 gem 'sassc-rails', '>= 2.1'
-# Use Uglifier as compressor for JavaScript assets
-gem 'uglifier', '>= 1.3'
+# Use Terser as compressor for JavaScript assets
+gem 'terser'
 # See https://github.com/rails/execjs#readme for more supported runtimes
 # gem 'therubyracer', platforms: :ruby
 

Gemfile.lock

@@ -387,6 +387,8 @@ GEM
       sprockets (>= 3.0.0)
     stringio (3.1.0)
     sysexits (1.2.0)
+    terser (1.2.0)
+      execjs (>= 0.3.0, < 3)
     test-unit (3.6.1)
       power_assert
     test-unit-activesupport (1.1.1)
@@ -410,8 +412,6 @@ GEM
     timeout (0.4.1)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
-    uglifier (4.2.0)
-      execjs (>= 0.3.0, < 3)
     unicode-display_width (2.5.0)
     uri (0.13.0)
     version_gem (1.1.3)
@@ -479,8 +479,8 @@ DEPENDENCIES
   sorcery
   sprockets-rails
   sysexits
+  terser
   test-unit-rails
-  uglifier (>= 1.3)
   web-console (~> 4.0)
   xmlrpc
 

config/environments/production.rb

@@ -24,7 +24,8 @@
   # config.public_file_server.enabled = false
 
   # Compress CSS using a preprocessor.
-  config.assets.js_compressor = :uglifier
+  config.assets.js_compressor = :terser
+  config.assets.terser = { output: { ascii_only: false } }
   # config.assets.css_compressor = :sass
 
   # Do not fallback to assets pipeline if a precompiled asset is missed.