HotSwap: Bringing Hot Code Reloading to Buck

HotSwap: Bringing hot code reloading to Buck

Every day hundreds of Facebook engineers make thousands of code changes, each of which requires at least one, and usually many, iterations of the edit-compile-run development cycle. To speed up this process, we built and open-sourced Buck, a build tool designed from the ground up for fast iteration, allowing engineers to compile and run changes quickly.