# config/boot.rb
​
require 'bootsnap/setup'

# Gemfile
​
gem 'bootsnap', '>= 1.4.2', require: false

# config/environments/development.rb
​
class Application < Rails::Application
  config.file_watcher = ActiveSupport::EventedFileUpdateChecker
end

# Gemfile
​
group :development do
  gem 'listen', '>= 3.0.5', '< 3.2'
  gem 'spring-watcher-listen', '~> 2.0.0'
end

# config/environments/test.rb
​
class Application < Rails::Application
  config.cache_classes = false
end

# config/spring.rb
​
Spring.watch(
  '.ruby-version',
  '.rbenv-vars',
  'tmp/restart.txt',
  'tmp/caching-dev.txt'
)

# Gemfile
​
group :development do
  gem 'spring'
  gem 'spring-watcher-listen', '~> 2.0.0'
end