# nodejs

Node.js and npm as a module (novox/hq ADR 0477 §4, issue 1573).

- **Declares the packages `nodejs` and `npm`.** Today dev-tools, lab and mesh-build-node declare some of them too,
  which the resolver allows (ADR 0303); once they require `node-toolchain` instead (issue 1573's second step), this
  is the only module that declares them, and `checks/toolchains` refuses another.
- **Provides `node-toolchain` with the machine's reach**: a module that requires it composes only on a machine where
  this module is assigned. It is never pulled in for whatever asked, so `nodejs` is assigned to a node on purpose.
  Nothing requires it yet; dev-tools, lab and mesh-build-node will, in the second step.
- Holds no long-running resource, so it adds nothing to `health-undeclared`.

The node-engine never uninstalls a package, so when the users stop declaring `nodejs` and `npm`, nothing leaves a
node that has this module.