Meta hands its open-source Jest JavaScript testing framework to the OpenJS Foundation to let the project flourish as a community-led initiative.

Now open sourced by Facebook under an MIT licence, Hermes is supposed to supercharge startup times, drain less memory and result in a smaller overall application code footprint.

With Tuesday’s release of Flow, an open source static type checker, Facebook engineers are continuing their recent efforts to seed the community at large with tools built in-house. “Flow adds ...