index.js

var npm = require('npm')
  , fs = require('fs')
  , rimraf = require('rimraf')
  , _ = require('underscore')
  , skipVersions = [ '0.2.1' ]
  , moduleBase = __dirname + '/node_modules/'
  , levelupBase = moduleBase + 'levelup'

if (fs.existsSync(levelupBase)) {
  rimraf.sync(levelupBase)
}

npm.load({}, function (err, npm) {
  npm.commands.info(['levelup'], getInfo)
})

function getInfo(err, info) {
  if (err) return
  var blob = Object.keys(info)[0]
  if (blob.versions && blob.versions.length) {
    installVersions(blob.versions)
    benchmarkVersions(blob.versions)
  }
}

function installVersions(versions) {

  function install(v, cb) {
    var levelupInstall = 'levelup@' + v
      , folder = moduleBase + levelupInstall

    if (!_.contains(skipVersions, v) && !fs.existsSync(folder)) {
      npm.commands.install([ levelupInstall ], function(err) {
        if (err) {
          cb(err)
        }
        else {
          fs.rename(levelupBase, folder, function(err) {
            cb(err ? err : null)
          })
        }
      })
    }
    else
      cb(null)
  }

  function installer(i) {
    if (i < versions.length) {
      install(versions[i], function(err) {
        if (err)
          console.log(err)
        else
          installer(i+1)
      })
    }
  }

  installer(0)
}

function benchmarkVersions(versions) {

}

jshintrc.js

{
    "predef": [ "assert", "refute", "define" ]
  , "boss": true
  , "bitwise": true
  , "shadow": true
  , "trailing": true
  , "immed": true
  , "latedef": false
  , "forin": false
  , "curly": false
  , "debug": true
  , "devel": false
  , "evil": true
  , "regexp": false
  , "undef": true
  , "sub": true
  , "white": false
  , "trailing": true
  , "asi": true
  , "laxbreak": true
  , "eqnull": true
  , "browser": true
  , "node": true
  , "laxcomma": true
  , "proto": true
  , "expr": true
  , "es5": true
  , "esnext": true
  , "strict": false
  , "onevar": true
}

result.txt

magnus@emachines|22:12|~/src/levelup-benchmark (master) $ jshint --config .jshintrc index.js 
index.js: line 17, col 17, 'getInfo' was used before it was defined.
index.js: line 26, col 25, 'installVersions' was used before it was defined.
index.js: line 62, col 27, 'benchmarkVersions' was used before it was defined.

3 errors