From 4bddd5c5a282ec9a528687323cbed1df45c8daba Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ond=C5=99ej=20=C5=A0pan=C4=9Bl?=
 <OndrejSpanel@users.noreply.github.com>
Date: Wed, 8 Feb 2017 09:22:39 +0100
Subject: [PATCH] Avoid using exports when they are not defined (like running
 in a browser).

---
 lib/ast.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/ast.js b/lib/ast.js
index 42506cb2..61643aed 100644
--- a/lib/ast.js
+++ b/lib/ast.js
@@ -81,7 +81,9 @@ function DEFNODE(type, props, methods, base) {
     ctor.DEFMETHOD = function(name, method) {
         this.prototype[name] = method;
     };
-    exports["AST_" + type] = ctor;
+    if (typeof exports !== "undefined") {
+        exports["AST_" + type] = ctor;
+    }
     return ctor;
 };