Ergonomic, hermetic, user-friendly software build system for Python, Go, Java, Kotlin, Protobuf, Scala, Shell. Pants lets you fearlessly scale up your codebase!

Pants

I was just talking to <@U04S45AHA> about the difference between a `RootRule` and a `@rule` with an empty dependency list

a RootRule is something that you are declaring can come in via a `product_request` (ie, at the "root" of the graph).

that means it can change per "call" to the engine: in particular, over the course of a pantsd's lifecycle

whereas an `@rule` with no arguments is created once at pants(d) start time: it's a singleton

there is a bit more about RootRule here: <https://github.com/pantsbuild/pants/blob/f9bb8d6cf172df3e8f68b091614e9fdb6dbc37dc/src/python/pants/engine/README.md#registering-rules>