use same instance on symlinked modules

index.js

@@ -27,6 +27,7 @@ var readonly = require('read-only-stream');
 module.exports = Browserify;
 inherits(Browserify, EventEmitter);
 
+var fs = require('fs');
 var path = require('path');
 var paths = {
     empty: path.join(__dirname, 'lib/_empty.js')
@@ -481,7 +482,7 @@ Browserify.prototype._createDeps = function (opts) {
                     return cb(null, paths.empty, {});
                 }
             }
-            cb(err, file, pkg);
+            cb(err, file && fs.realpathSync(file), pkg);
         });
     };
 

test/symlink_dedupe.js

@@ -0,0 +1,16 @@
+var browserify = require('../');
+var vm = require('vm');
+var test = require('tap').test;
+
+test('hash instances with hashed contexts', function (t) {
+    t.plan(5);
+
+    var b = browserify(__dirname + '/symlink_dedupe/main.js');
+    b.bundle(function (err, buf) {
+        var c = { t: t };
+        var src = buf.toString('utf8');
+        t.equal(src.match(RegExp('// FILE F ONE', 'g')).length, 1);
+        t.equal(src.match(RegExp('// FILE G ONE', 'g')).length, 1);
+        vm.runInNewContext(src, c);
+    });
+});

test/symlink_dedupe/main.js

@@ -0,0 +1,6 @@
+var A = require('./one/f.js');
+var B = require('./one/dir/f.js');
+t.equal(A, B);
+t.equal(A(), 555);
+t.equal(B(), 555);
+

test/symlink_dedupe/one/dir

@@ -0,0 +1 @@
+.

test/symlink_dedupe/one/f.js

@@ -0,0 +1,3 @@
+// FILE F ONE
+var G = require('./g.js');
+module.exports = function () { return 111 * G };

test/symlink_dedupe/one/g.js

@@ -0,0 +1,2 @@
+// FILE G ONE
+module.exports = 5