whippy-edition/bin/yarn

#!/usr/bin/env ruby
APP_ROOT = File.expand_path('..', __dir__)
Dir.chdir(APP_ROOT) do
  yarn = ENV["PATH"].split(File::PATH_SEPARATOR).
    select { |dir| File.expand_path(dir) != __dir__ }.
    product(["yarn", "yarn.cmd", "yarn.ps1"]).
    map { |dir, file| File.expand_path(file, dir) }.
    find { |file| File.executable?(file) }

  if yarn
    exec yarn, *ARGV
  else
    $stderr.puts "Yarn executable was not detected in the system."
    $stderr.puts "Download Yarn at https://yarnpkg.com/en/docs/install"
    exit 1
  end
end