Add support for the Bun and pnpm package managers.

[commiterate]

Description

Mirroring a similar contribution to shadow-cljs.

• Issue: Add support for the Bun and pnpm package managers. thheller/shadow-cljs#1196
• Pull Request: Add support for the Bun and pnpm package managers. thheller/shadow-cljs#1193

See the shadow-cljs issue for a more detailed "why".

This also adds support for node_modules indexing with the Bun runtime.

Testing

I've avoided adding additional tests in src/test/clojure/cljs/foreign/node_test.clj for the time being since I'm not sure how the ClojureScript CI environment is configured (not sure if Bun and pnpm are available).

Instead, I created a test repository with a barebones CLJS project using the fork (sourced in deps.edn with the git procurer).

https://github.com/commiterate/test-clojurescript-bun

This repository uses Emmy to create a Node.js application that just prints 2¹ (using Emmy's exp2 function) to stdout.

A reproducible shell is provided with Nix for additional testing by the ClojureScript team and others.

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There's notes in the test repository's readme detailing some sharp edges with:

• Using the ClojureScript compiler build API with tools.build (classpath issues breaking deps.cljs searches).
• Using the ClojureScript compiler CLI.

These might be of interest to the ClojureScript team for future improvements.