remove console.log on assets precompile

Question

During assets:precompile the javascript is minified, but console.logs are left in.

is there a way to remove all console.logs on precompile when the code is pushed to production?

Answer 1

As of Uglifier 2.4.0 the :compress option includes support for :drop_console which means you can easily remove all console.* functions using something like this in your config/environments/production.rb file:

# Compress JavaScripts
config.assets.compress = true
config.assets.js_compressor = Uglifier.new(
  # Remove all console.* functions
  :compress => { :drop_console => true }
) if defined? Uglifier

Answer 2

You could add this to application.js.erb. This solution would prevent any logging to console.log() in production environment, period. But it will still allow logging to console.error().

<% if Rails.env.production? %>
  window.console = {};
  window.console.log = function(){};
<% else %>
  // the || in the code ensures IE compatability
  window.console = window.console || {};
  window.console.log = window.console.log || function(){};
<% end %>