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# Description This PR adds a `ListItem` enum to our set of AST types. It encodes the two possible expressions inside of list expression: a singular item or a spread. This is similar to the existing `RecordItem` enum. Adding `ListItem` allows us to remove the existing `Expr::Spread` case which was previously used for list spreads. As a consequence, this guarantees (via the type system) that spreads can only ever occur inside lists, records, or as command args. This PR also does a little bit of cleanup in relevant parser code.
Nushell core libraries and plugins
These sub-crates form both the foundation for Nu and a set of plugins which extend Nu with additional functionality.
Foundational libraries are split into two kinds of crates:
- Core crates - those crates that work together to build the Nushell language engine
- Support crates - a set of crates that support the engine with additional features like JSON support, ANSI support, and more.
Plugins are likewise also split into two types:
- Core plugins - plugins that provide part of the default experience of Nu, including access to the system properties, processes, and web-connectivity features.
- Extra plugins - these plugins run a wide range of different capabilities like working with different file types, charting, viewing binary data, and more.