refator: use error-first-handler

src/pre.js

@@ -6,21 +6,19 @@ var semver = require('semver')
 
 var type = require('../lib/type')
 var version = require('../lib/version')
+var efh = require('../lib/error').efh
 
 module.exports = function (options, cb) {
-  type(function (err, type) {
-    if (err) return cb(err)
+  type(efh(cb)(function (type) {
     if (!type) return cb(null, null)
 
     var path = './package.json'
     var pkg = JSON.parse(fs.readFileSync(path))
-    version(pkg, function (err, version, unpublished) {
-      if (err) return cb(err)
-
+    version(pkg, efh(cb)(function (version, unpublished) {
       pkg.version = unpublished ? '1.0.0' : semver.inc(version, type)
       if (!options.debug) fs.writeFileSync(path, JSON.stringify(pkg, null, 2))
 
       cb(null, pkg.version)
-    })
-  })
+    }))
+  }))
 }