Add optional argument isDeep to File.clone

README.md

@@ -77,9 +77,11 @@ Returns true if file.contents is a Stream.
 
 Returns true if file.contents is null.
 
-### clone()
+### clone([opt])
 
-Returns a new File object with all attributes cloned. Custom attributes are deep-cloned.
+Returns a new File object with all attributes cloned. Custom attributes are deep-cloned by default.
+
+If opt.isDeep is false, a shallow clone will be performed.
 
 ### pipe(stream[, opt])
 

index.js

@@ -2,7 +2,7 @@ var path = require('path');
 
 var cloneStats = require('clone-stats');
 var _ = require('lodash');
-var cloneDeep = _.cloneDeep;
+var cloneShallow = _.clone;
 
 var isBuffer = require('./lib/isBuffer');
 var isStream = require('./lib/isStream');
@@ -44,12 +44,15 @@ File.prototype.isDirectory = function() {
   return this.isNull() && this.stat && this.stat.isDirectory();
 };
 
-File.prototype.clone = function() {
+File.prototype.clone = function(opt) {
+  if (!opt) opt = {};
+  if (typeof opt.isDeep === 'undefined') opt.isDeep = true;
+
   var clone = new File();
 
   Object.keys(this).forEach(function(key) {
     if (key !== '_contents' && key !== 'stat') {
-      clone[key] = cloneDeep(this[key]);
+      clone[key] = cloneShallow(this[key], opt.isDeep);
     }
   }, this);
 

test/File.js

@@ -251,7 +251,7 @@ describe('File', function() {
 
       done();
     });
-  
+
     it('should copy custom properties', function(done) {
       var options = {
         cwd: "/",
@@ -270,7 +270,27 @@ describe('File', function() {
       file2.base.should.equal(file.base);
       file2.path.should.equal(file.path);
       file2.custom.should.not.equal(file.custom);
+
+      done();
+    });
+
+    it('should support shallow cloning of custom properties', function(done) {
+      var options = {
+        cwd: "/",
+        base: "/test/",
+        path: "/test/test.coffee",
+        contents: null
+      };
+
+      var file = new File(options);
+      file.custom = { a: { b: 'custom property' } };
+
+      var file2 = file.clone({ isDeep: false });
+
+      file2.should.not.equal(file, 'refs should be different');
+      file2.custom.should.not.equal(file.custom);
       file2.custom.a.should.equal(file.custom.a);
+      file2.custom.a.b.should.equal(file.custom.a.b);
 
       done();
     });