You can use Node modules in Deno using https://esm.sh/

You can use Deno modules in Node using https://github.com/denoland/dnt

Depends if your package uses any specific Deno/Node APIs. Deno also only supports ESM (which you should be using anyway).

There is, however, a Node compatibility layer for Deno: https://deno.land/manual@v1.14.1/npm_nodejs/std_node