[STRML]

I agree that this is the future. But that will mean telling everyone that they should now run their node_modules through Babel - no inconsequential feat, given the size of the code that must now be transpiled.

[untog]

It's not just that - is JSX part of ES6? It isn't, but a lot of pre-Babel transpiled code uses it. So people would need to transpile to ES6 for distribution, then to ES5 when someone uses the library.

Messy.

[spankalee]

Don't distribute JSX, it's not JavaScript. Distribute what engines actually support.

[untog]

A nice sentiment, but you could say the exact same thing about ES6. "What engines actually support" is a pretty fuzzy metric.