From a245d4707ef65a5326d9325efb67e224cb057822 Mon Sep 17 00:00:00 2001
From: Thai Pangsakulyanont <dtinth@spacet.me>
Date: Mon, 17 Feb 2020 14:49:28 +0700
Subject: [PATCH] Do not use postMessage on file:// protocols

Fixed #770
---
 packages/core-js/internals/task.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/core-js/internals/task.js b/packages/core-js/internals/task.js
index 834585fe5a9a..459a01923a75 100644
--- a/packages/core-js/internals/task.js
+++ b/packages/core-js/internals/task.js
@@ -76,7 +76,7 @@ if (!set || !clear) {
     defer = bind(port.postMessage, port, 1);
   // Browsers with postMessage, skip WebWorkers
   // IE8 has postMessage, but it's sync & typeof its postMessage is 'object'
-  } else if (global.addEventListener && typeof postMessage == 'function' && !global.importScripts && !fails(post)) {
+  } else if (global.addEventListener && typeof postMessage == 'function' && !global.importScripts && !fails(post) && location.protocol !== 'file:') {
     defer = post;
     global.addEventListener('message', listener, false);
   // IE8-