From db4aa95d4ad0901c690ff517c6600ae63cc905a5 Mon Sep 17 00:00:00 2001 From: Kyle Date: Fri, 25 Aug 2017 15:56:54 -0700 Subject: [PATCH] Only polyfill Promise if it doesn't exist at all --- src/polyfills.js | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/src/polyfills.js b/src/polyfills.js index 295898a6..d3695134 100644 --- a/src/polyfills.js +++ b/src/polyfills.js @@ -1,2 +1,5 @@ // Promise global, Used ( at least ) by 'whatwg-fetch'. And required by IE 11 -require("core-js/fn/promise") + +if(!window.Promise) { + require("core-js/fn/promise") +}