Keep imports to babel helpers (#8)

Author: Andarist

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(),