Couldn't find the language specification anywhere, it basically the Nix source? The repo's README refers to the Nix manual, but it seems incomplete. For example
sql-server
autoresetevent
orchestration-step
tadotable
mongoose-middleware
back
web-clips
react-usememo
sunmi
shopify-activemerchant
dladdr
viewstub
angular2-aot
xgettext
microsoft-graph-files
swiftui-navigationlink
s3proxy
flutter-windows
ytplayerview
paintbox
git-filter
angular-jest
n-dimensional
android-assetpacks
dxf
excel4node
kepserverex
ionic-keyboard
new-expression
io-uring