rails5系でwebpack + reactを導入する方法

下記の手順で行けました！

# gemfile
gem 'webpacker'

# terminal
$ bundle install

$ ./bin/rails webpacker:install
$ ./bin/rails webpacker:install:react

# application.html.haml
= javascript_pack_tag 'hello_react'

参考記事

https://learnetto.com/tutorials/how-to-use-react-with-the-webpacker-gem-and-rails-5-1