From 46efa1da86d2f886afa2323aef25944b049a6709 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hu=C3=A1ng=20J=C3=B9nli=C3=A0ng?= <jlhwung@gmail.com>
Date: Wed, 11 Dec 2019 17:20:59 -0500
Subject: [PATCH] fix: add .js extension to injected polyfill imports

---
 packages/babel-preset-env/src/utils.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/packages/babel-preset-env/src/utils.js b/packages/babel-preset-env/src/utils.js
index dc81f30e4b00..4184eb745f21 100644
--- a/packages/babel-preset-env/src/utils.js
+++ b/packages/babel-preset-env/src/utils.js
@@ -57,11 +57,11 @@ export function isPolyfillSource(source: ?string): boolean {
 }
 
 const modulePathMap = {
-  "regenerator-runtime": "regenerator-runtime/runtime",
+  "regenerator-runtime": "regenerator-runtime/runtime.js",
 };
 
 export function getModulePath(mod: string): string {
-  return modulePathMap[mod] || `core-js/modules/${mod}`;
+  return modulePathMap[mod] || `core-js/modules/${mod}.js`;
 }
 
 export function createImport(path: NodePath, mod: string) {