[elpool2]

I have a Typescript project with over 200k loc and over 200 ts files. The current compiler takes a while to build the whole project, but still under 10 seconds. However, you can also set it up to compile when you save a single ts file, which is much faster. So in practice its not any slower than what I was doing with Javascript, which was hit ctrl-S to save my changes then quickly hit refresh in Chrome to test and debug.