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Trying to call `metadata $env` or `metadata $nu` will throw an error: ```Nushell ~> metadata $nu Error: × Built-in variables `$env` and `$nu` have no metadata ╭─[entry #1:1:1] 1 │ metadata $nu · ─┬─ · ╰── no metadata available ╰──── ```
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.