webpack-dev-server

#!/usr/bin/env ruby
# frozen_string_literal: true

$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_FILE       = File.join(APP_PATH, 'config/webpacker.yml')
NODE_MODULES_PATH = File.join(APP_PATH, 'node_modules')
WEBPACK_CONFIG    = File.join(APP_PATH, 'config/webpack/development.js')

def args(key)
  index = ARGV.index(key)
  index ? ARGV[index + 1] : nil
end

begin
  dev_server = YAML.load_file(CONFIG_FILE)['development']['dev_server']

  DEV_SERVER_HOST = "http#{'s' if args('--https') || dev_server['https']}://#{args('--host') || dev_server['host']}:#{args('--port') || dev_server['port']}"
rescue Errno::ENOENT, NoMethodError
  puts "Webpack dev_server configuration not found in #{CONFIG_FILE}."
  puts 'Please run bundle exec rails webpacker:install to install webpacker'
  exit!
end

newenv = {
  'NODE_PATH' => NODE_MODULES_PATH.shellescape,
  'ASSET_HOST' => DEV_SERVER_HOST.shellescape,
}.freeze

cmdline = ['yarn', 'webpack-dev-server', WEBPACK_CONFIG] + ARGV

Dir.chdir(APP_PATH) do
  exec newenv, *cmdline
end