$ mkdir projects
$ cd projects
$ rails new ideastore
    create
    create  README.md
    create  Rakefile
...
    remove  config/initializers/cors.rb
    remove  config/initializers/new_framework_defaults_6_0.rb
       run  bundle install
Fetching gem metadata from https://rubygems.org/............
Fetching gem metadata from https://rubygems.org/.
Resolving dependencies...
Using rake 13.0.1
Using concurrent-ruby 1.1.7
...
Fetching webpacker 4.3.0
Installing webpacker 4.3.0
Bundle complete! 17 Gemfile dependencies, 74 gems now installed.
Use `bundle info [gemname]` to see where a bundled gem is installed.
    run  bundle binstubs bundler
    run  bundle exec spring binstub --all
* bin/rake: Spring inserted
* bin/rails: Spring inserted
      rails  webpacker:install
    create  config/webpacker.yml
Copying webpack core config
    create  config/webpack
    create  config/webpack/development.js
    create  config/webpack/environment.js
    create  config/webpack/production.js
    create  config/webpack/test.js
...
Installing all JavaScript dependencies [4.3.0]
         run  yarn add @rails/webpacker@4.3.0 from "."
yarn add v1.22.4
info No lockfile found.
[1/4] 🔍  Resolving packages...
...
[2/4] 🚚  Fetching packages...
[3/4] 🔗  Linking dependencies...
[4/4] 🔨  Building fresh packages...
...
├─ webpack-dev-middleware@3.7.2
├─ webpack-dev-server@3.11.0
└─ ws@6.2.1
✨  Done in 19.51s.
Webpacker successfully installed 🎉 🍰