From 3793776f75748e1629bb9b732d09ce34ff197eb3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mateusz=20Burzy=C5=84ski?= <mateuszburzynski@gmail.com>
Date: Fri, 8 Feb 2019 09:47:45 +0100
Subject: [PATCH] Keep imports to babel helpers

---
 rollup.config.js | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/rollup.config.js b/rollup.config.js
index 12b23fb..8efcdd5 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -4,6 +4,15 @@ import flow from 'rollup-plugin-flow'
 import commonjs from 'rollup-plugin-commonjs'
 import { uglify } from 'rollup-plugin-uglify'
 import replace from 'rollup-plugin-replace'
+import pkg from './package.json'
+
+const makeExternalPredicate = externalArr => {
+  if (externalArr.length === 0) {
+    return () => false
+  }
+  const pattern = new RegExp(`^(${externalArr.join('|')})($|/)`)
+  return id => pattern.test(id)
+}
 
 const minify = process.env.MINIFY
 const format = process.env.FORMAT
@@ -47,7 +56,14 @@ export default {
     },
     output
   ),
-  external: ['react', 'prop-types', 'final-form', 'react-final-form'],
+  external: makeExternalPredicate(
+    umd
+      ? Object.keys(pkg.peerDependencies || {})
+      : [
+          ...Object.keys(pkg.dependencies || {}),
+          ...Object.keys(pkg.peerDependencies || {})
+        ]
+  ),
   plugins: [
     resolve({ jsnext: true, main: true }),
     flow(),