[spion]

I feel more comfortable writing TypeScript rather than using an ES6 transpiler, really. The compiler is built really well - you can observe the team's development process on github and I have to say the level is quite impressive (extensive code reviews and great discussions on the issue tracker).

[BinaryIdiot]

I'm sure the compiler is well built but stability is my main concern. JavaScript, even with its many flaws, is used by millions of people every day and is one of the most used programming languages in existence. That's a ton of testing through real world use. Since transpilers just compile to JavaScript, they can take advantage of some of the same stability of JavaScript for its output but the act of transpiling is only used by maybe a few thousand users. Sure they'll find bugs and fix them but that's nowhere near the same level as simply writing in native JavaScript (native JavaScript, is that an oxymoron? lol).

Besides all that everything ever created has bugs; why risk introducing bugs from a JavaScript engine and from a transpiler when you can risk a single one?

As an aside my first and last time using CoffeeScript I ran into an issue that, since this was about two years ago, has already been fixed but at the time it cost me hours of debugging time. It really soured my experience with any transpiler.

[peferron]

You have a very valid point regarding bugs. Transpiler bugs definitely happen. When I first tried using Babel - still named 6to5 then - instead of Traceur, it immediately broke my code because of an incorrect TCO implementation in Babel. Babel's maintainer (sebmck) is insanely responsive and the bug was fixed almost immediately, but still.

If I used Babel or any other transpiler for critical production code, I would only enable a whitelist of features that I thoroughly understand: for example, how a fat arrow is translated into a regular function. This vetting would be time-consuming, but that's a price I'd be willing to pay because I enjoy writing ES6 much more than ES5. That's highly subjective though, so I completely understand how some other people would rather just stick to ES5 and get stuff done with the lowest possible risk of weird things happening.

[zghst]

Babel is a completely different transpirer than all the others. It's goal is readable, understandable transpiled code and Sebastian (sebmck) is a genius robot wunderkind. I check the repo everyday and see new updates, bug fixes, etc. It is heartening to see someone give a project so much dedication.

I have an affinity for Babel unlike any other JS project (except React). They team works really hard to keep it interesting.

[peferron]

Yeah, Babel and the Babel team is great. I got very suspicious of the project after my first experience with it broke perfectly valid code, but after reporting the issue and then another and having them fix it almost immediately they won my confidence back. :)

For production code I'd still stick to a whitelist of features that have been released for at least a month though. Babel is aggressively pursuing ES6 coverage and new features might not have all edge cases covered when they're released. Give them one month though and with their responsiveness it's 90% likely it's going to be fixed.

[hokkos]

The same can be said for Babel, and it is actually very simple to predict or retro-engineer the transpilation from ES6 to 5.