Set does not work in <IE11

[rdmurphy]

Hello! 👋

Not flagging this to suggest it should work in anything below IE11, but the README currently says quicklink supports IE9+ as long as you have an Intersection Observer polyfill. However Set is not available until IE11. I think a user would need to have a Set polyfill in place to ensure it works that far back?

Apologies if I'm missing something! But wanted to flag just in case.

[tharun208]

Hi,
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set
By Going through this documentation, You can see that , ie11 doesnot have New Set() options

[addyosmani]

Thanks for filling this issue. We should update the README with a reference to Babel's polyfills, or specifically, importing a shim for Set() to work around this problem for IE9+ users https://github.com/zloirock/core-js/blob/master/README.md or
https://github.com/paulmillr/es6-shim/blob/master/README.md.

[rdmurphy]

@addyosmani 👋 After doing another pass I think it may need to mention Array.from too? IE doesn't support it at all, unfortunately.

@tharun208 IE11 is fine with a bare new Set() without parameters (and the other uses of Set in quicklink), it's when you try to pass an interable in it gets mad.

var set = new Set([1, 2, 3]); // IE11 will be upset about this

[addyosmani]

@rdmurphy 👋 I've just landed aa40490. Could you let me know if there's anything more you think we should add?

[rdmurphy]

@addyosmani Looks good to me! 🙌

[addyosmani]

Awesome. Closing this now that it's documented. Cheers! :)