webpack-dev-server

#!/usr/bin/env ruby
$stdout.sync = true

require "shellwords"
require "yaml"

ENV["RAILS_ENV"] ||= "development"
RAILS_ENV = ENV["RAILS_ENV"]

ENV["NODE_ENV"] ||= RAILS_ENV
NODE_ENV = ENV["NODE_ENV"]

APP_PATH    = File.expand_path("../", __dir__)
CONFIG_PATH = File.join(APP_PATH, "config/webpack/paths.yml")

begin
  paths = YAML.load(File.read(CONFIG_PATH))[NODE_ENV]

  NODE_MODULES_PATH   = File.join(APP_PATH.shellescape, paths["node_modules"])
  WEBPACK_CONFIG_PATH = File.join(APP_PATH.shellescape, paths["config"])

  WEBPACK_BIN       = "#{NODE_MODULES_PATH}/.bin/webpack-dev-server"
  DEV_SERVER_CONFIG = "#{WEBPACK_CONFIG_PATH}/development.server.js"
rescue Errno::ENOENT, NoMethodError
  puts "Configuration not found in config/webpacker/paths.yml."
  puts "Please run bundle exec rails webpacker:install to install webpacker"
  exit!
end

Dir.chdir(APP_PATH) do
  exec "NODE_PATH=#{NODE_MODULES_PATH} #{WEBPACK_BIN} --progress --color " \
    "--config #{DEV_SERVER_CONFIG} #{ARGV.join(" ")}"
end