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I think ClojureScript has been able to compile itself since ~2015 if I remember correctly. There is some helper libraries that makes the experience nicer nowadays too, tools like KLIPSE (https://github.com/viebel/klipse)
Here are some starting points:
- https://clojurescript.org/guides/self-hosting
- https://practicalli.github.io/clojurescript/quickstart/self-...
- https://blog.klipse.tech/clojurescript/2016/04/04/self-host-...
... except when you target JavaScript - which is not an expression oriented language. So `let` will be wrapped in an immediately invoked function expression (IIFE). Google Closure does elide these when it can, but it will give up after only a few levels of nesting. For an IIFE to appear in the middle of conditional is a performance killer.
Another complication is that it's not safe to just use `&&` and `||` blindly because of `0` and the empty string and the other cases which are not false-y in Clojure(Script). Checks for JavaScript false-y values are a performance killer.
So years ago we implemented a simple form of type inference which annotates the AST with type information as a compiler pass on every node when possible. As long we know the JavaScript `if` will receive a boolean value we can elide the JS false-y value check.
But this is also exactly the information we need to safely run a following pass that looks for the above and/or syntactical patterns and optimize it. As long as each nested `if` is guaranteed to return a boolean, we can remove the local and use `&&` or `||` instead.
The and/or optimization pass ended up being ~120 lines of code with no actual dependencies on anything else in the ClojureScript analyzer or compiler because the ClojureScript AST is just plain EDN - https://github.com/clojure/clojurescript/blob/master/src/mai...
Happy to answer any further questions about this!