Come to think of it, I don’t know why Node doesn’t have this. It’d be pretty trivial, no?
You do have a few nodejs/typescript/javascript kernels that work fine, so I don't see the point for rewriting Jupiter in node specifically for any reason.
In any case, maybe creating something for the browser only is easier because JS is native, but still I wouldn't call it "pretty trivial". For this use case (and more) you have projects like
It is a really powerful toolset, and building your own environment from separate parts is not trivial; so having it preconfigured in a standard way that others can reuse is no small matter.
I prefer online notebooks with a functional-reactive behaviour, such as ObservableHQ (which is JavaScript-based, rather than python); but Jupyter was the first popular one, so it hit hard.
https://mobile.twitter.com/observablehq/status/1234868724588...
Observable looks cool, but it doesn’t seem portable. It really bums me out that so much of the JS ecosystem is so sheerly commercial in this way. Sometimes I don’t understand why this is like this compared to the Python ecosystem. It’s not that I’m cheap either. I’ll happily pay for things that are properly monetized and provide a good value for my time. This doesn’t seem like it.