perf(resolve): resolve package.json according to npm version

task/lib/isNpm3Up.js

@@ -0,0 +1,16 @@
+// 3rd party modules
+var childProcess = require('child_process');
+
+// public
+module.exports = isNpm3Up;
+
+// implementation
+function isNpm3Up () {
+  return parseFloat(getNpmVersion()) >= 3;
+}
+
+function getNpmVersion () {
+  return childProcess.execSync('npm --version', {
+    encoding: 'utf8'
+  }).trim();
+}

task/resolveTarball/resolveLocally/index.js

@@ -1,10 +1,14 @@
 // modules
-var getPkgPath = require('./getPkgPath');
+var getNpm2PkgPath = require('./npm2');
+var getNpm3PkgPath = require('./npm3');
+var isNpm3Up = require('../../lib/isNpm3Up');
 
 // public
 module.exports = resolveLocally;
 
 // implementation
+var getPkgPath = isNpm3Up() ? getNpm3PkgPath : getNpm2PkgPath;
+
 function resolveLocally (dep) {
   return getPkgPath(dep)
     .then(function (pkgPath) {