From aacbce87595f681689ca4b8198534e5570b5b991 Mon Sep 17 00:00:00 2001
From: Rich Harris <richard.a.harris@gmail.com>
Date: Thu, 9 Jul 2015 17:05:18 -0400
Subject: [PATCH] prevent some unnecessary work

---
 src/Statement.js | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/Statement.js b/src/Statement.js
index 7bde15e..0d665f6 100644
--- a/src/Statement.js
+++ b/src/Statement.js
@@ -221,6 +221,8 @@ export default class Statement {
 		const dependencies = Object.keys( this.dependsOn );
 
 		return sequence( dependencies, name => {
+			if ( this.defines[ name ] ) return; // TODO maybe exclude from `this.dependsOn` in the first place?
+
 			return this.module.define( name ).then( definition => {
 				result.push.apply( result, definition );
 			});