新手问题 有没有 Asset Pipeline 的增强 gem 支持编译 ES6 的？
想在 js 里用 ES6 特性但是感觉不想用 Webpacker（要安装的依赖太多），有没有好办法？
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jasl
jasl
命令行显示：
Fetching gem metadata from https://rubygems.org/.............
Fetching gem metadata from https://rubygems.org/.
Could not find gem 'sprockets (~> 4.0)' in any of the gem sources listed in your Gemfile.
Gemfile 文件：
source 'https://rubygems.org'
git_source(:github) do |repo_name|
repo_name = "#{repo_name}/#{repo_name}" unless repo_name.include?("/")
"https://github.com/#{repo_name}.git"
end