Hi. I'm the original (and the only!) author of jazzle. I started working on it around Sep. 2015. I am from a country where I can no longer access npm without tor, and even then it is so excruciatingly slow as to be unusable. As such, aside from the ever essential node and vi, I had to build everything, including the builder and the test framework, not to mention the parser, the emitter, and the transformer, and the bundler, from scratch, by myself.

it certainly took some time, but now, it can even build itself!

Among its features are:

* very fast compilation times (2x faster than babel, with sourcemaps, on my early benchmarks.)

* on-the-fly minification

* built-in bundling

* economic sourcemaps

* built-in regex-verifier (and I'm working on a standalone regex-emitter, too)

* runtime this-before-super() checks

* runtime (rather than parse-time) checks for constant re-assignments

* cheap yet full temporal-dead-zone tracker (and everyone thought it is impossible)

* non-invasive, arguably more efficient transformation for loops having closures around their lexicals

* zero-dependencies, obviously (though I'm not much proud of it; cf. above)

* aggressive temporary-variable-reuse (though I have to say there are still some rough edges)

* and needless to say, nearly all ES2015 constructs (except for getters/setters and generators; I'm currently working on a cool generator transformer too, but that's at least two months away.)

Now, this is a project still in its infancy (and the two years I've been working on it had better be looked at as its embryohood), and I have to confess I'm getting more and more spent working on it, so I'm actively, eagerly looking for collaborators, particularly for receiving real-world feedback and for helping me complete the test suite.

Comments, suggestions and any other sort of feedback is most welcome.

Thanks a lot reading this far.