From d9cbce1862d8677a175de779d602286875f39f05 Mon Sep 17 00:00:00 2001
From: Jay Phelps <hello@jayphelps.com>
Date: Fri, 3 Apr 2015 22:42:53 -0700
Subject: [PATCH] [BUGFIX] checking whether value key is in descriptor instead
 of checking if value is truthy since !!0 === false

class Foo {
  static bar = 0;
}

Foo.bar++;
// Cannot assign to read only property 'bar' of function
---
 src/babel/transformation/templates/helper-create-class.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/babel/transformation/templates/helper-create-class.js b/src/babel/transformation/templates/helper-create-class.js
index 09df13e546..f4b4c20145 100644
--- a/src/babel/transformation/templates/helper-create-class.js
+++ b/src/babel/transformation/templates/helper-create-class.js
@@ -4,7 +4,7 @@
       var descriptor = props[i];
       descriptor.enumerable = descriptor.enumerable || false;
       descriptor.configurable = true;
-      if (descriptor.value) descriptor.writable = true;
+      if ("value" in descriptor) descriptor.writable = true;
       Object.defineProperty(target, descriptor.key, descriptor);
     }
   }