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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
That's not an issue of the kata rather the compiler used to compile the ES2015 code.
If you could mark this issue as resolved though, thanks :)