Webpack dev server

Rakefile

namespace :server do
  desc "Start the webpack dev server"
  task :webpack do
    system "./bin/webpack-dev-server"
  end

  desc "Start the rails dev server"
  task :rails do
    system "rails server"
  end
end

desc "Start the rails and webpack dev servers"
task :server do
  threads = []
  %w{webpack rails}.each do |task|
    threads << Thread.new(task) do
      Rake::Task["server:#{task}"].invoke
    end
  end
  threads.each { |thread| thread.join }
end