use node-v8-clone for performance, fallback to lodash #29

.gitignore

@@ -3,4 +3,5 @@
 node_modules
 build
 *.node
-components
+components
+coverage

index.js

@@ -1,13 +1,17 @@
 var path = require('path');
 
+var clone;
+try {
+  clone = require('node-v8-clone').clone;
+} catch(e) {
+  clone = require('lodash').clone;
+}
 var cloneStats = require('clone-stats');
-var cloneDeep = require('lodash').cloneDeep;
-
+var cloneBuffer = require('./lib/cloneBuffer');
 var isBuffer = require('./lib/isBuffer');
 var isStream = require('./lib/isStream');
 var isNull = require('./lib/isNull');
 var inspectStream = require('./lib/inspectStream');
-var cloneBuffer = require('./lib/cloneBuffer');
 
 function File(file) {
   if (!file) file = {};
@@ -54,18 +58,18 @@ File.prototype.clone = function(opt) {
     opt.contents = opt.contents !== false;
   }
 
-  var clone = new File();
+  var file = new File();
 
   Object.keys(this).forEach(function(key) {
     if (key !== '_contents' && key !== 'stat') {
-      clone[key] = opt.deep === true ? cloneDeep(this[key]) : this[key];
+      file[key] = opt.deep === true ? clone(this[key], true) : this[key];
     }
   }, this);
 
-  clone.contents = opt.contents && this.isBuffer() ? cloneBuffer(this.contents) : this.contents;
-  clone.stat = this.stat ? cloneStats(this.stat) : null;
+  file.contents = opt.contents && this.isBuffer() ? cloneBuffer(this.contents) : this.contents;
+  file.stat = this.stat ? cloneStats(this.stat) : null;
 
-  return clone;
+  return file;
 };
 
 File.prototype.pipe = function(stream, opt) {

package.json

@@ -22,6 +22,9 @@
     "lodash.templatesettings": "^2.4.1",
     "event-stream": "^3.1.0"
   },
+  "optionalDependencies": {
+    "node-v8-clone": "~0.6.2"
+  },
   "scripts": {
     "test": "mocha --reporter spec && jshint . --exclude node_modules",
     "coveralls": "istanbul cover _mocha --report lcovonly -- -R spec && cat ./coverage/lcov.info | coveralls && rm -rf ./coverage"

test/File.js

@@ -1,4 +1,3 @@
-var File = require('../');
 var Stream = require('stream');
 var fs = require('fs');
 var path = require('path');
@@ -8,6 +7,26 @@ require('mocha');
 
 describe('File', function() {
 
+  describe('using node-v8-clone', function() {
+    var File = require('../');
+    testFile(File);
+  });
+
+  describe('using lodash', function() {
+    delete require.cache[path.join(__dirname, '../index.js')];
+    var clonePath = path.join(__dirname, '../node_modules/node-v8-clone/lib/clone.js');
+    var exports = require.cache[clonePath].exports;
+    // test lodash when node-v8-clone is not found
+    require.cache[clonePath].exports = undefined;
+    after(function() {
+      require.cache[clonePath].exports = exports;
+    });
+    var File = require('../');
+    testFile(File);
+  });
+});
+
+function testFile(File) {
   describe('constructor()', function() {
     it('should default cwd to process.cwd', function(done) {
       var file = new File();
@@ -703,5 +722,4 @@ describe('File', function() {
       }).should.throw('path should be string');
     });
   });
-
-});
+}