Rails, sprockets, google closure and advanced opts

Question

I've added the closure-compiler gem to my Gemfile and set

config.assets.js_compressor = :closure

in the config/environments/production.rb file.

I believe this defaults to using the SIMPLE_OPTIMIZATIONS compilation level and I was wondering if there is a config variable I can set somewhere to specify the advanced level instead.

I tried digging through the sprockets code but haven't found a way to pass options to the js_compressor yet.

Answer 1

Check out this issue: https://github.com/rails/rails/issues/2693

To put in simple terms, the given solution is:

# config.assets.js_compressor = :closure
require 'closure-compiler'
config.assets.js_compressor = Closure::Compiler.new(compilation_level: 'ADVANCED_OPTIMIZATIONS')