Today we are happy to announce the next major release of Jest. We have made major changes to Jest which are going to benefit you and all of Facebook's JavaScript test infrastructure. Most importantly, we added static types to all of Jest's code during a recent Jest hackathon at Facebook. Fifteen people worked for a day and night to add Flow types to Jest and to add new features to Jest. The Flow types serve two purposes: First, we believe that code is written to be read. Most of the time, cod...
