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Nice idea as a faster incremental development tool, but not something that one should run in production.

Why not? Stick an HTTP cache (Varnish, Cloudflare, whatever) in front of it, and I see no reason not to do the preprocessing on the fly.

Also: "Harp apps run directly with the built-in web server, or exported to HTML, CSS & JS, putting you in full control of your production environment."

I agree, I'd run it production. Full disclosure: I know the team. But I'm a fan of the approach!

Just because you can, doesn't mean you should.

Again, why not?

It would reduce the number of differences between dev and production, for one.

>"A witty saying proves nothing."

Node + Varnish + (optionally) CDN is a very production-ready stack for serving static content.

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