TypeError: promisify is not a function

[gps67]

sudo npm install -g vuepress
/usr/bin/vuepress -> /usr/lib/node_modules/vuepress/bin/vuepress.js
/usr/lib
└── [email protected]

npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@^1.1.2 (node_modules/vuepress/node_modules/chokidar/node_modules/fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for [email protected]: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})

vuepress dev

TypeError: promisify is not a function
at Object. (/usr/lib/node_modules/vuepress/lib/prepare.js:6:18)
at Module._compile (module.js:571:32)
at Object.Module._extensions..js (module.js:580:10)
at Module.load (module.js:488:32)
at tryModuleLoad (module.js:447:12)
at Function.Module._load (module.js:439:3)
at Module.require (module.js:498:17)
at require (internal/module.js:20:19)
at dev (/usr/lib/node_modules/vuepress/lib/dev.js:14:19)
at args (/usr/lib/node_modules/vuepress/bin/vuepress.js:83:12)

[ulivz]

util.promisify is introduced from node 8, try to update your node version.

  // package.json
  "engines": {
    "node": ">=8"
  },