What sort of tooling is required for wasm? Let's say I wanted to deploy a middle tier in our app, consisting of some nodejs code that talks to an external datab

What sort of tooling is required for wasm? Let's say I wanted to deploy a middle tier in our app, consisting of some nodejs code that talks to an external database. We'd use a Dockerfile, install nodejs or use a source image to build from. How does that work for wasm? Does it have layers to reuse?