I tried to replace Node with Bun, but had the following compatibility problems.

localAddress on TCP connections ignored, last time I tried it its no-op

Incompatibility with Node module APIs (https://github.com/spamscanner/spamscanner wouldn't work)

EventEmitter race problems (partially worked around with https://www.npmjs.com/package/eventemitter2)

Svelte vites dev server sometimes forever freeze until I wiped node_modules and reinstalled it.