From 852f78491a212ba20841847436dab93abb0a8181 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: Fri, 24 Feb 2017 01:51:24 +0100
Subject: [PATCH] Avoid using exports when undefined (#1471)

Makes direct usage within web browser easier, even if officially unsupported.
---
 lib/ast.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/ast.js b/lib/ast.js
index 42506cb299..61643aedf4 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;
 };