# Packaging guidelines
## Entrypoint
Every lovelace module has an entrypoint in the form of a `.js` file. By
default the nixos module will try to load `${pname}.js` when a module is
configured.
The entrypoint used can be overridden in `passthru` like this:
```nix
{ passthru.entrypoint = "demo-card-bundle.js"; }
```