Object doesn't support property or method 'find' in IE11

[wzc19920413]

Bug or feature request?

Bug

Expected behavior

To be able to drag and drop on IE11

Actual behavior

App can not be opened and cause error:

SCRIPT438: Object doesn't support property or method 'find'

Steps to reproduce

I think this is related to #320

The console error points to the file supported-page-visibility-event-name.js

Not sure whether there are other files that would cause the error

What version of React are you using?

16.2.0

What version of react-beautiful-dnd are you running?

9.0.0

What browser are you using?

IE11

Demo

[alexreardon]

Related: #320

For now you can polyfill .find

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/find#Polyfill

[alexreardon]

I don't think we will stop using .find, but we should be clearer about what polyfills are required for IE11.

[wuweiweiwu]

Can I pick this up? :)

[alexreardon]

Sure @wuweiweiwu. At this stage we would be after a guide that states that we require .find to be polyfilled for ie11

[tgormtx]

I've added polyfills to my app and it doesn't solve the problem. Why is filter, which is support, not being used?

[alexreardon]

@tgormtx this has now been resolved in version 10 which should be shipping soon. We will no longer require any poly filling for ie 11

#838

[alexreardon]

Closed by #838. See version 10 release notes

[wuweiweiwu]

Should the README be updated?

[alexreardon]

Yep! PR welcome!

…

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