diff --git a/README.md b/README.md
index 8005b3f..e2fe903 100644
--- a/README.md
+++ b/README.md
@@ -59,7 +59,7 @@ var bar = require('foo/bar.js')
 ### Attentions
 
 - Require hook will pollute `Module._load()`. You must be knowing this, and there's a `requere/deregister` to help you disable require hook.
-- `requere`'s require hook may conflict with other package's require hook, e.g. [`CoffeeScript`](http://coffeescript.org/), [`Babel`](https://babeljs.io/). Though my test looks fine when using `requere`, `CoffeeScript` and `Babel` together.
+- `requere`'s require hook may conflict with other package's require hook, e.g. [`CoffeeScript`](http://coffeescript.org/), [`Babel`](https://babeljs.io/). If you use `requere()` instead register hook, everything goes fine.
 
 # Contributors
 
diff --git a/lib/resolver.js b/lib/resolver.js
index c7e6a80..5547d8d 100644
--- a/lib/resolver.js
+++ b/lib/resolver.js
@@ -1,16 +1,20 @@
+var Module = require('module')
 var path = require('path')
 var fs = require('fs')
 
-function exists (target) {
-  var found = false
-
-  found = fs.existsSync(target)
-
-  if (!found && path.extname(target) === '') {
-    found = fs.existsSync(target + '.js')
+function exists (target, extensions) {
+  if (fs.existsSync(target)) {
+    return target
   }
 
-  return found
+  if (path.extname(target) === '') {
+    for (var i = 0; i < extensions.length; i++) {
+      var resolvedPath = target + extensions[i]
+      if (fs.existsSync(resolvedPath)) {
+        return resolvedPath
+      }
+    }
+  }
 }
 
 module.exports = function resolver (request, parent) {
@@ -20,17 +24,19 @@ module.exports = function resolver (request, parent) {
 
   var resolvedPath
   var i = 0
+  var extensions = Object.keys(Module._extensions)
 
   for (i = 0; i < parent.paths.length; i++) {
-    resolvedPath = path.resolve(parent.paths[i], request)
-    if (fs.existsSync(resolvedPath)) {
+    resolvedPath = exists(path.resolve(parent.paths[i], request), extensions)
+    if (resolvedPath) {
       return resolvedPath
     }
   }
 
   for (i = 0; i < parent.paths.length; i++) {
     resolvedPath = path.resolve(parent.paths[i].slice(0, parent.paths[i].lastIndexOf('node_modules')), request)
-    if (exists(resolvedPath)) {
+    resolvedPath = exists(resolvedPath, extensions)
+    if (resolvedPath) {
       return resolvedPath
     }
   }
diff --git a/package.json b/package.json
index 0a58bc9..6f58142 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,7 @@
   "main": "index.js",
   "scripts": {
     "lint": "./node_modules/eslint/bin/eslint.js .",
-    "test": "node node_modules/istanbul/lib/cli.js cover node_modules/mocha/bin/_mocha --check-leaks test/*.js",
+    "test": "node node_modules/istanbul/lib/cli.js cover node_modules/mocha/bin/_mocha --check-leaks test/standalone/index.js test/register/index.js",
     "test-travis": "npm run lint && npm test"
   },
   "repository": {
@@ -19,7 +19,6 @@
   },
   "homepage": "https://github.com/chrisyip/requere",
   "devDependencies": {
-    "babel": "^5.0.12",
     "chai": "^2.2.0",
     "coffee-script": "^1.9.1",
     "eslint": "^0.19.0",
diff --git a/test/index.js b/test/index.js
deleted file mode 100644
index f932977..0000000
--- a/test/index.js
+++ /dev/null
@@ -1,79 +0,0 @@
-var expect = require('chai').expect
-var requere = require('../')
-
-describe('requere()', function () {
-  afterEach(function () {
-    require('../deregister.js')
-  })
-
-  it('should be a function', function () {
-    expect(requere).to.be.a('function')
-  })
-
-  it('should require module correctly', function () {
-    var path = requere('path')
-    expect(path).to.equal(require('path'))
-    expect(require('./textual/a.js')).to.equal(requere('test/textual/a.js'))
-  })
-
-  it('should resolve module start from module root', function () {
-    var res1 = requere('test/textual/nested/nested')
-    var res2 = require('../test/textual/nested/nested.js')
-
-    expect(res1).to.be.equal(res2)
-  })
-
-  it('should work with transipler', function () {
-    require('babel/register')
-
-    require('coffee-script/register')
-
-    var b = requere('test/textual/b.coffee')
-    expect(b()).to.equal('Module B')
-
-    var es = requere('test/textual/es6.js').func
-    expect(es()).to.equal('ES 6 Module')
-  })
-
-  it('should throw exception if module cannot found', function () {
-    var func = function () {
-      requere('module_not_found')
-    }
-    expect(func).to.throw('Cannot find module \'module_not_found\'')
-  })
-})
-
-describe('requere/register', function () {
-  var path = require('path')
-  requere('register.js')
-
-  it('should require module correctly', function () {
-    var _path = require('path')
-    expect(path).to.equal(_path)
-  })
-
-  it('should resolve module start from module root', function () {
-    var res = require('test/textual/nested/nested')
-
-    expect(res).to.be.equal('foo.js in nested folders')
-  })
-
-  it('should work with transipler', function () {
-    require('babel/register')
-
-    require('coffee-script/register')
-
-    var b = require('test/textual/b.coffee')
-    expect(b()).to.equal('Module B')
-
-    var es = require('test/textual/es6.js').func
-    expect(es()).to.equal('ES 6 Module')
-  })
-
-  it('should throw exception if module cannot found', function () {
-    var func = function () {
-      require('module_not_found')
-    }
-    expect(func).to.throw('Cannot find module \'module_not_found\'')
-  })
-})
diff --git a/test/register/index.js b/test/register/index.js
new file mode 100644
index 0000000..c50a283
--- /dev/null
+++ b/test/register/index.js
@@ -0,0 +1,31 @@
+var expect = require('chai').expect
+var path = require('path')
+
+require('../../register.js')
+
+describe('requere/register', function () {
+  it('should require module correctly', function () {
+    var _path = require('path')
+    expect(path).to.equal(_path)
+  })
+
+  it('should resolve module start from module root', function () {
+    var res = require('test/textual/nested/nested')
+
+    expect(res).to.be.equal('foo.js in nested folders')
+  })
+
+  it('should work with transipler', function () {
+    require('coffee-script/register')
+
+    var b = require('test/textual/b.coffee')
+    expect(b()).to.equal('Module B')
+  })
+
+  it('should throw exception if module cannot found', function () {
+    var func = function () {
+      require('module_not_found')
+    }
+    expect(func).to.throw('Cannot find module \'module_not_found\'')
+  })
+})
diff --git a/test/standalone/index.js b/test/standalone/index.js
new file mode 100644
index 0000000..a671907
--- /dev/null
+++ b/test/standalone/index.js
@@ -0,0 +1,35 @@
+var expect = require('chai').expect
+var requere = require('../../index.js')
+
+describe('requere()', function () {
+  it('should be a function', function () {
+    expect(requere).to.be.a('function')
+  })
+
+  it('should require module correctly', function () {
+    var path = requere('path')
+    expect(path).to.equal(require('path'))
+    expect(require('../textual/a.js')).to.equal(requere('test/textual/a.js'))
+  })
+
+  it('should resolve module start from module root', function () {
+    var res1 = requere('test/textual/nested/nested')
+    var res2 = require('../../test/textual/nested/nested.js')
+
+    expect(res1).to.be.equal(res2)
+  })
+
+  it('should work with transipler', function () {
+    require('coffee-script/register')
+
+    var b = requere('test/textual/b.coffee')
+    expect(b()).to.equal('Module B')
+  })
+
+  it('should throw exception if module cannot found', function () {
+    var func = function () {
+      requere('module_not_found')
+    }
+    expect(func).to.throw('Cannot find module \'module_not_found\'')
+  })
+})
diff --git a/test/textual/es6.js b/test/textual/es6.js
deleted file mode 100644
index 3ebcb6d..0000000
--- a/test/textual/es6.js
+++ /dev/null
@@ -1,5 +0,0 @@
-function func() {
-  return 'ES 6 Module'
-}
-
-export {func}
diff --git a/test/textual/nested/nested.js b/test/textual/nested/nested.js
index 7b11892..ee136b2 100644
--- a/test/textual/nested/nested.js
+++ b/test/textual/nested/nested.js
@@ -1 +1,2 @@
-module.exports = require('test/textual/nested/foo.js')
+var requere = require('../../../index.js')
+module.exports = requere('test/textual/nested/foo.js')