If the flow plugin runs before the class properties one (or if the class properties plugin isn't used), we remove uninitialize class fields:

class Foo { x: string }

currently becomes

class Foo {}

while it should be

class Foo { x }

If someone still wants the old behavior, they can either use flow comments (as [offically recommended](https://github.c

The function returned by createAnalyticsEventHandler() in new checkout is used by many parts of checkout, but the most critical may be error reporting where it logs fatal errors to logstash so we can be notified of them.

Unfortunately, there are occasionally bugs introduced into this rather large function and if an error occurs there, it will not be reported.

I think it would be a good ide

This would be a nice little feature to have, Excel users are using this a lot.