require 'rails/generators'
require 'rails'

module Uswds
  module Generators
    class InstallGenerator < Rails::Generators::Base

      desc "This generator installs USWDS framework to Asset Pipeline"
      def add_assets
        js_inject = " //= require uswds"
        app_js = File.join(Rails.root, 'app', 'assets', 'javascripts', 'application.js')
        css_inject = " *= require uswds"
        app_scss = File.join(Rails.root, 'app', 'assets', 'stylesheets', 'application.scss')
        app_css = File.join(Rails.root, 'app', 'assets', 'stylesheets', 'application.css')

        if File.exist?(app_js)
          insert_into_file app_js, js_inject, :after => "require jjquery\n"
        else
          say_status('','Nor application.js could not be found!')
        end

        if File.exist?(app_scss)
          insert_into_file app_scss, css_inject, :after => "require_self\n"
        elsif File.exist?(app_css)
          insert_into_file app_css, css_inject, :after => "require_self\n"
        else
          say_status('','Nor application.css/application.scss could not be found!')
        end
      end
    end
  end
end

require 'rails/generators'
require 'rails'

module Uswds
  module Generators
    class InstallGenerator < Rails::Generators::Base

      desc "This generator installs USWDS framework to Asset Pipeline"
      def add_assets
        js_inject = " //= require uswds"
        app_js = File.join(Rails.root, 'app', 'assets', 'javascripts', 'application.js')
        css_inject = " *= require uswds"
        app_scss = File.join(Rails.root, 'app', 'assets', 'stylesheets', 'application.scss')
        app_css = File.join(Rails.root, 'app', 'assets', 'stylesheets', 'application.css')

        if File.exist?(app_js)
          insert_into_file app_js, js_inject, :after => "require jquery\n"
        else
          say_status('','Nor application.js could not be found!')
        end

        if File.exist?(app_scss)
          insert_into_file app_scss, css_inject, :after => "require_self\n"
        elsif File.exist?(app_css)
          insert_into_file app_css, css_inject, :after => "require_self\n"
        else
          say_status('','Nor application.css/application.scss could not be found!')
        end
      end
    end
  end
end

Update install generator - unfortunate typo.
Update install generator - unfortunate typo.