From 7953eb560e61392a68a9fbdb4eed9aeb5c52e213 Mon Sep 17 00:00:00 2001
From: Sebastian McKenzie <sebmck@gmail.com>
Date: Thu, 12 Feb 2015 07:45:50 +1100
Subject: [PATCH] force experimental and playground flag when
 whitelisting/optionalising transformers

---
 lib/6to5/transformation/file.js | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/lib/6to5/transformation/file.js b/lib/6to5/transformation/file.js
index 337de4e922..db41639118 100644
--- a/lib/6to5/transformation/file.js
+++ b/lib/6to5/transformation/file.js
@@ -176,6 +176,15 @@ File.prototype.normalizeOptions = function (opts) {
                   "`reactCompat` - backwards compatibility will be removed in v4.0.0");
   }
 
+  var ensureEnabled = function (key) {
+    var namespace = transform.namespaces[key];
+    if (namespace === "playground") opts.playground = true;
+    if (namespace === "experimental") opts.experimental = true;
+  };
+
+  each(opts.whitelist, ensureEnabled);
+  each(opts.optional, ensureEnabled);
+
   return opts;
 };