flow-typed usage metrics

[Brianzchen]

Do you want to request a feature or report a bug?
feature

What is the current behavior?
N/A

If this is a feature request, what is motivation or use case for changing the behavior?
Albeit less than TS, we do have many flow-typed defs. It would be interesting if there was a metric of usage to better understand, which defs the community largely depended on and need maintenance vs completely unused which gives the chance to clean up, eg: styled-components in their earlier iterations have completely broken tests that would need a major overhaul but we don't know what the impact would be.

I'm also interested to know how many consumers there are vs the handful of contributors.

Metrics could include

• Downloads, which can be pinged everytime flow-typed install is run on a single dependency regardless if an update actually happens to the users codebase
• flow-typed install of non-existent defs which would cause stubs which can help to understand defs that may be missing
• reports split up by flow version to form a metric on what version the community is largely on