skeleton for dashboard2 based on vux2.

src/prog/dashboard2/build/check-versions.js

@@ -1,7 +1,7 @@
 var chalk = require('chalk')
 var semver = require('semver')
 var packageConfig = require('../package.json')
-var shell = require('shelljs')
+
 function exec (cmd) {
   return require('child_process').execSync(cmd).toString().trim()
 }
@@ -12,15 +12,12 @@ var versionRequirements = [
     currentVersion: semver.clean(process.version),
     versionRequirement: packageConfig.engines.node
   },
-]
-
-if (shell.which('npm')) {
-  versionRequirements.push({
+  {
     name: 'npm',
     currentVersion: exec('npm --version'),
     versionRequirement: packageConfig.engines.npm
-  })
-}
+  }
+]
 
 module.exports = function () {
   var warnings = []