The author has an entire section on long cycle times (time to make a change, compile/transpile it, and try it out) but it hasn't been nearly as bad for me. The

The author has an entire section on long cycle times (time to make a change, compile/transpile it, and try it out) but it hasn't been nearly as bad for me. The worst case I've experienced was a large Grails app using Babel transpilation that could take a minute to compile all assets on first startup. But that worst case only happened after a full clean. Incremental builds took about 2 seconds. I've never experienced a 5 minute cycle time due to a transpiler. In our case the productivity gains from ES6 features easily outweighed the compilation time.