Array.prototype.flat polyfill is missing

[yratanov]

Hello, I'm using "ember-cli-babel": "^7.7.3"

array.flat in Edge browser throws an error, while array.flatMap is working.

[yratanov]

may be related with:

https://github.com/babel/babel/issues/9749

[Exelord]

I confirm. Looks like there is no polyfill for that

[Exelord]

Babel polyfill has been deprecated. (https://github.com/babel/babel/tree/master/packages/babel-polyfill)

We should upgrade this package to use core-js explicitly.

[Exelord]

@rwjblue any plans moving to core-js 3? :)

[rwjblue]

I haven't really looked into it much, but off the cuff I would think that we would follow suit with Babel and remove the polyfilling.

Folks would then use something like ember-auto-import to get these polyfills like the @babel/polyfill site suggests.

[boris-petrov]

@rwjblue - we just hit the same issue (flat missing). I don't understand your comment - is there something we can do right now as users or we have to wait for ember-cli-babel to be updated?

[dbashford]

Also curious if there is something that could be done now

[pzuraq]

One option is to use https://github.com/pzuraq/ember-cli-babel-polyfills, just updated it to use the latest core-js and confirmed it has Array.flat, plus it ensures that the polyfills are only included in legacy browsers by using nomodule, so modern users don't pay the cost 😄

[Exelord]

Awesome. Yep that's the solution :)

[dbashford]

That gets flat in (via core-js/stable), if I was interested in all the esnext stuff as well, should I just be importing core-js myself? Or might that be something ember-cli-babel-polyfills or eventually ember-cli-babel may support?

[bertdeblock]

Going to close this as polyfill support was removed in v8.