yarn versions
显示当前安装的 Yarn、Node.js 及他们的依赖项的版本信息。
yarn versions 
yarn versions
yarn versions v0.24.5
{ http_parser: '2.7.0',
  node: '7.10.0',
  v8: '5.5.372.43',
  uv: '1.11.0',
  zlib: '1.2.11',
  ares: '1.10.1-DEV',
  modules: '51',
  openssl: '1.0.2k',
  icu: '58.2',
  unicode: '9.0',
  cldr: '30.0.3',
  tz: '2016j' }
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