I use watchify [1] for incremental builds. The initial build is still long (10 - 30 seconds, as you said), but with each change after that the build updates in

I use watchify [1] for incremental builds. The initial build is still long (10 - 30 seconds, as you said), but with each change after that the build updates in < 1 second. [1] https://github.com/substack/watchify https://github.com/substack/watchify