Abusing constants table in ClojureScript's compiler

roman01la · January 6, 2020, 11:02am

I wrote a short note about extending constants hoisting mechanism in ClojureScript’s compiler to arbitrary values, not only symbols and keywords. The example described in the post is based on the implementation in UIx library. Though it might be interesting for someone who wants to learn more about the compiler.

gist.github.com

https://gist.github.com/roman01la/85b7a473f5a5d48612c99d9bc6dc4f03

index.md

# Abusing constants table in ClojureScript's compiler

In React wrapper library [UIx](https://github.com/roman01la/uix) that I'm working on there's `defui` macro that [compiles Hiccup directly into React's VirtualDOM](https://github.com/roman01la/uix#hiccup-pre-compilation-advanced). Apart from doing that the macro also hooks into the compiler to hoist constant parts of VirtualDOM across components and namespaces, so that those parts will be essentially [interned](https://en.wikipedia.org/wiki/String_interning) (cached).

Here's an example of two components defined in different namespaces where both of them share a part of the structure.

```clojure
(ns foo.core
  (:require [uix.core.alpha :refer [defui]]))

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system · July 6, 2020, 11:02pm

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