Let's try to change Uglifier settings properly

config/environments/production.rb

@@ -12,11 +12,7 @@ Discourse::Application.configure do
   # Disable Rails's static asset server (Apache or nginx will already do this)
   config.serve_static_assets = GlobalSetting.serve_static_assets
 
-  if defined?(Uglifier)
-    config.assets.js_compressor = Uglifier.new(output: {max_line_len: 1024}, screw_ie8: false)
-  else
-    config.assets.js_compressor = :uglifier
-  end
+  config.assets.js_compressor = :uglifier
 
   config.assets.css_compressor = :sass
 

lib/tasks/assets.rake

@@ -54,7 +54,7 @@ task 'assets:precompile:before' do
 
       def evaluate(context, locals, &block)
         ::Sprockets.cache_compiled("uglifier", data) do
-           Uglifier.new(:comments => :none).compile(data)
+           Uglifier.new(:comments => :none, screw_ie8 => false, :output => {max_line_len: 1024}).compile(data)
         end
       end