Tonic Notebooks
Any notebook in Tonic can also be a node module, and can be required by any other notebook in Tonic like this:
require("notebook")("tonic/package-server/1.0.0")
Here, package-server is the name of the notebook, and 1.0.0 is the
specific version we're requiring (using semver, of course).
Within Tonic this just works. Outside of Tonic, you can npm install this package to make these requires work.
Note: this package currently makes blocking calls, so you probably don't want to use it in performance sensitive places.