From c6c0bc07e2127d99a6ae9a594dbdae480aeedaca Mon Sep 17 00:00:00 2001
From: Sebastian McKenzie <sebmck@gmail.com>
Date: Fri, 3 Apr 2015 04:39:39 +1100
Subject: [PATCH] fix empty whitelist in build-external-helpers - fixes #1129

---
 src/babel/tools/build-external-helpers.js | 4 ++--
 test/core/api.js                          | 6 ++++++
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/babel/tools/build-external-helpers.js b/src/babel/tools/build-external-helpers.js
index 8f026258d8..4e3401af78 100644
--- a/src/babel/tools/build-external-helpers.js
+++ b/src/babel/tools/build-external-helpers.js
@@ -50,9 +50,9 @@ function buildVar(namespace, builder) {
   return t.program(body);
 }
 
-function buildHelpers(body, namespace, whitelist = []) {
+function buildHelpers(body, namespace, whitelist) {
   each(File.helpers, function (name) {
-    if (whitelist.length && whitelist.indexOf(name) === -1) return;
+    if (whitelist && whitelist.indexOf(name) === -1) return;
 
     var key = t.identifier(t.toIdentifier(name));
     body.push(t.expressionStatement(
diff --git a/test/core/api.js b/test/core/api.js
index ca7c42ad15..b662cc1fe1 100644
--- a/test/core/api.js
+++ b/test/core/api.js
@@ -33,5 +33,11 @@ suite("api", function () {
       assert.ok(script.indexOf("classCallCheck") === -1);
       assert.ok(script.indexOf("inherits") >= 0);
     });
+
+    test("empty whitelist", function () {
+      var script = buildExternalHelpers([]);
+      assert.ok(script.indexOf("classCallCheck") === -1);
+      assert.ok(script.indexOf("inherits") === -1);
+    });
   });
 });