Erik Arvidsson, Mark Miller, Waldemar Horwat, Andreas Rossberg, Nebojša Ćirić, Mark Davis, Jungshik Shin and I attend TC39 meetings, work on implementations, and try to push JS forward in good faith. And boy, does it need a push.
Erik and I have specifically been working to focus the TC39 agenda away from syntax-free, semantics-only APIs (Object.defineProperty, anyone?) which might be good for tools, compilers, and frameworks but which are hard for day-to-day use.
Through Traceur and other efforts we’ve been socializing the idea that the one thing the committee can exclusively do — and should do more of — is to carve out syntax for commonly exercised semantics. Seemingly small things like the
But it’s not the end — not by a long shot. Classes will give us a humane, interoperable inheritance syntax, but it leaves composition unaddressed by syntax. I’m hopeful that we bless traits in future versions, removing the use of inheritance in most cases. Similarly, I think we can find a way to repair “this” binding foot-guns with softly-bound “this”. Repairing the shared-prototypes issue, either through DOM or through something like Scoped Object Extensions, can and should be done. And once we have all of this, the stage will be set for a flexible, advanced type system that does not need to be all-or nothing and does not need to be hobbled by the ghost of C++/Java’s inflexible nominal-only types. That’s the dream, and we’re not shying away from it.
There are risks, of course. TC39 is long on seasoned language design skill and short on webdev experience, meaning that many things that Erik and I may take for granted as pressing problems need to be explained, sometimes to an incredulous audience. The flip side risk is that naïve solutions may have better alternatives that seasoned language hands can quickly spot and that simple answers have non-obvious risks or preclude movement in other important areas later. It’s good, then, that the committee is working well and is taking appeals to developer productivity seriously.
The only thing that’s going to replace the web as universal platform is the next version of the web. Those of us working on Chrome believe that to the core and feel a deep urge to make things better faster. We might not always agree on the “how,” but we all believe that we can’t do it alone.