$ yarn global add vuepress
yarn global v0.27.5
warning package.json: No license field
warning No license field
[1/4] Resolving packages...
[2/4] Fetching packages...
[3/4] Linking dependencies...
[4/4] Building fresh packages...
warning Your current version of Yarn is out of date. The latest version is "1.6.0" while you're on "0.27.5".
info To upgrade, run the following command:
$ npm upgrade --global yarn
success Installed "vuepress@0.7.1" with binaries:
      - vuepress
warning No license field
Done in 14.12s.

$ echo '# Hello VuePress' > README.md

$ vuepress dev
Error: Cannot find module './Mime'
    at Function.Module._resolveFilename (module.js:547:15)
    at Function.Module._load (module.js:474:25)
    at Module.require (module.js:596:17)
    at require (internal/module.js:11:18)
    at Object.<anonymous> (/Users/z/.config/yarn/global/node_modules/mime/index.js:3:12)
    at Module._compile (module.js:652:30)
    at Object.Module._extensions..js (module.js:663:10)
    at Module.load (module.js:565:32)
    at tryModuleLoad (module.js:505:12)
    at Function.Module._load (module.js:497:3)

$ node -v
v8.10.0