Hack provides an option that no other popular member of the MPDPL family has: the ability to introduce a type system after initial development, and only in the parts of the system where the value exceeds the cost.
Taking PHP Seriously
Keith Adams
2.4K109

There is now Flow for JS (by FB) and also type hinting in Python

One clap, two clap, three clap, forty?

By clapping more or less, you can signal to us which stories really stand out.