Parse error with type annotation in fat-arrow about flow HOT 7 CLOSED

For what it's worth, this works:

var f: (t: string) => string = (t) => t;

from flow.

👍

from flow.

+1

from flow.

I actually just refactored the parser this weekend to make it really easy to add features to arrow functions, like type annotations, type parameters, async, generators, etc. It slows down the parsing at the moment by like 14%, which isn't great, but parsing isn't the majority of our time at the moment so I'm not sure if we mind too much.

from flow.

This just landed in master (yay!) and will hopefully be fixed in the next release.

from flow.

Also it shouldn't cause a perf regression, thanks to some great advice from @bhosmer :)

from flow.

0.12 is out, should be fixed!

from flow.