Only polyfill Promise if it doesn't exist at all
#3613
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Confirmed working in IE11. Merging! |
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Fixes #3586.
Adding this conditional overrides the test in core-js that overwrites
window.Promiseif the Promise implementation isn't standard (discussion: zloirock/core-js#283, angular/zone.js#783).This may open us up to issues with non-standard browsers, and applications that use funky Promise implementations, but the risk isn't widespread.
TODO: