I rather replace bun with deno, given that now both bun and deno are written in Rust, and Deno have even more node compatibility than bun. Deno and Node both runs on V8, while Bun runs on JSC, and Deno has a killer feature that you don't have to even run npm install to use package, you can just top-level import or await import an URL (given that you allowed it with a command prompt or bypass it competely with -A but discouraged).

I've used Deno, CucumberJS and Playwright to write E2E test suites. Zero npm install and not even deno.json or package.json