Does core-js/stable include Promise.allSettled?

[Mrman]

Hi there, trying to understand a little more of core-js. I need to polyfill to Promise.allSettled for Edge.

I see allSettled was recognized as stable in v3.2.0 of core-js (Release notes: "Promise.allSettled moved to stable ES, per July TC39 meeting"). Am I interpreting that correctly to mean it should be there when I import "core-js/stable"?

I've tested with a new brand new app using create-react-app and see Promise.allSettled as undefined in Microsoft Edge 44.18362.449.0.

Browserlist from package.json is:

"development": [
            ">0.2%",
            "not dead",
            "not ie <= 11",
            "not op_mini all",
            "edge > 1"
    ]

I see it does get polyfilled correctly if I just import "core-js"

What am I overlooking?

Thanks :)

[erikt9]

I had this problem too. What you need to do is in your @babel/env configuration you need to specify corejs of 3.2 or higher (the examples and docs all just show using 3 😝 so it's difficult to know this). https://babeljs.io/docs/en/babel-preset-env

[Mrman]

Thanks @erikt9. That appears to be the issue, CRA uses just major version 3 in the configuration and it isn't possible to change without ejecting. I created an issue there: facebook/create-react-app#8779