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There's an issue open for JSX: https://gitlab.com/Rich-Harris/buble/issues/26. The short answer is it's definitely on the TODO list, either as a separate preprocessing step that uses the same techniques (buble-jsx), or in the tool itself. Just haven't got round to it yet :)

I continue to use babel 5.x which is much easier to use than babel 6.x which cannot be globally installed. Babel 5.x supports jsx by default. Would be great if buble would have feature parity with babel 5.x to ease the switch over.

It appears somebody has made a standalone JSX transform that will operate directly on files if you desire, and output to string.

https://github.com/alexmingoia/jsx-transform/

I think it would not be too much work to wrap it in a script to let you pipe into/out of other build steps.

I haven't used it, but another option might be TypeScript with the "jsx" flag. Or use babel, but only with the react preset.