From 5f6f757bd059fe6ec3e30c2382420886d9e3834f Mon Sep 17 00:00:00 2001
From: Andreas Hocevar <andreas.hocevar@gmail.com>
Date: Mon, 10 Jul 2017 18:59:58 +0200
Subject: [PATCH] Update rollup configuration

---
 tasks/build-ext.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tasks/build-ext.js b/tasks/build-ext.js
index 211e5df494..18651389c5 100644
--- a/tasks/build-ext.js
+++ b/tasks/build-ext.js
@@ -47,6 +47,7 @@ function main() {
   return Promise.all(pkg.ext.map(ext => {
     const moduleName = ext.name || ext.module;
     const options = {
+      extend: true,
       entry: require.resolve(ext.module),
       dest: `${path.join(__dirname, '..', 'build', 'ol.ext', moduleName.toLowerCase())}.js`,
       format: 'iife',