Adds polyfill for CustomEvent
What does this MR do?
CustomEvent is not supported by IE.- https://developer.mozilla.org/en-US/docs/Web/API/CustomEvent
In order to stop using jQuery in new files that need to listen to custom events we need this polyfill.
Are there points in the code the reviewer needs to double check?
Why was this MR needed?
Screenshots (if relevant)
Does this MR meet the acceptance criteria?
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Changelog entry added -
Documentation created/updated -
API support added - Tests
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Added for this feature/bug -
All builds are passing
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Conform by the merge request performance guides -
Conform by the style guides -
Branch has no merge conflicts with master(if it does - rebase it please) -
Squashed related commits together