1. it often fails to find the type for an imported piece of code 2. more often than not refers to the type definition being a problem rather than whoever's calling a function with an incorrect type 3. it seems to have an issue with cache busting(?) (I `killall flow` multiple times per day to make sure it's not complaining about old code)
All in all I feel very sad for choosing Flow over TypeScript two weeks ago. We felt TS would be more invasive to our Webpack pipeline but I think I might just take a weekend to migrate over to TS...
TS seems to have a lot more type definitions available as well, a more active community perhaps?
Looking at the issue list of Flow I'm starting to suspect they're not very active in maintenance / issue handling. TS seems much more active.