```ruby
# Frozen-string-literal: true
# Copyright: 2017 - 2018 - MIT License
# Author: Jordon Bedwell
# Encoding: utf-8

module Jekyll
  module Assets
    module Compressors
      class Uglify < Sprockets::UglifierCompressor
        def call(input)
          out = super(input)
          Hook.trigger :asset, :after_compression do |h|
            h.call(input, out, "application/javascript")
          end
          out
        end
      end

      Hook.register :env, :before_init, priority: 1 do |e|
        uglifier_config = e.asset_config[:compressors][:uglifier].symbolize_keys

        Sprockets.register_compressor "application/javascript",
          :assets_uglify,
          Uglify.new(uglifier_config)
      end

      Hook.register :env, :after_init, priority: 3 do |e|
        e.js_compressor = nil
        next unless e.asset_config[:compression]
        if Utils.javascript?
          e.js_compressor = :assets_uglify
        end
      end
    end
  end
end
```

Make sure our compressor is ran, the hooks are necessary.
user
```ruby
# Frozen-string-literal: true
# Copyright: 2017 - 2018 - MIT License
# Author: Jordon Bedwell
# Encoding: utf-8

module Jekyll
  module Assets
    module Compressors
      class Uglify < Sprockets::UglifierCompressor
        def call(input)
          out = super(input)
          Hook.trigger :asset, :after_compression do |h|
            h.call(input, out, "application/javascript")
          end
          out
        end
      end

      # rubocop:disable Metrics/LineLength
      Sprockets.register_compressor "application/javascript", :assets_uglify, Uglify
      Hook.register :env, :after_init, priority: 3 do |e|
        next unless e.asset_config[:compression]

        e.js_compressor = nil unless Utils.javascript?
        config = e.asset_config[:compressors][:uglifier].symbolize_keys
        e.js_compressor = Uglify.new(config) if Utils.javascript?
      end
    end
  end
end
```
assistant