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Wow. Could it also work with JavaScript?

Not really due to the fundamental difference between Lisp and JavaScript syntax.

You could borrow the idea of indentation inferring function scope structure and make a plugin that would modify JavaScript syntax accordingly, but I'm not sure that would even be desirable when writing JavaScript.

Parinfer is made possible by Lisp's unique syntax.

Check out Kent Beckman's Prune for ideas along this line: https://www.facebook.com/notes/kent-beck/prune-a-code-editor.... It's not quite the same since it's more like an enforced paredit, but it contains a lot of similar ideas and also enforces indentation.

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