class Webpacker::DevServerRunner

def execute_cmd
  env = Webpacker::Compiler.env
  cmd = if node_modules_bin_exist?
    ["#{@node_modules_bin_path}/webpack-dev-server"]
  else
    ["yarn", "webpack-dev-server"]
  end
  cmd += ["--config", @webpack_config]
  cmd += ["--progress", "--color"] if @pretty
  Dir.chdir(@app_path) do
    Kernel.exec env, *cmd
  end
end