If this is something you're open to

Depends on how much work it is.
If its a few imports, yes.
If its a major rewrite of a some subsystem no.
Something in between, maybe.

(Feel free to share what you found here)

Unlikely will happen officially, there is no benefit for us to maintain multiple runtimes, we will use more time to deal with it in the future. The situation would be similar to current situation SQLite + MariaDB. There are a few SQL statements won't work on both DBs, we have to handle it and test it with extra efforts.

For unofficial fork or experiment, feel free to try. I think it could possible by removing some unsupported features, since Bun is promoted itself as a Node.js drop-in replacement.

I just have a quick test. It is not able to start the server on both Bun and Deno currently on the master branch.

Bun

bun install
bun server/server.js

• Knex issues
• NotImplementedError: perf_hooks.monitorEventLoopDelay is not yet implemented in Bun.

Deno

deno install
deno --unstable-detect-cjs --allow-all server/server.js

• Knex issues