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# Description Before this PR, `length` did not check its input type at run-time, so it would attempt to calculate a length for any input with indeterminate type (e.g., `echo` which has an `any` output type). This PR makes `length` only work on the types specifically supported in its input/output types (list/table, binary, and nothing), making the behavior the same at parse-time and at run-time. Fixes #14462 # User-Facing Changes Length will error if passed an unsupported type: Before (only caught at parse-time): ```nushell "hello" | length Error: nu::parser::input_type_mismatch × Command does not support string input. ╭─[entry #2:1:11] 1 │ "hello" | length · ───┬── · ╰── command doesn't support string input ╰──── echo "hello" | length # => 1 ``` After (caught at parse-time and run-time): ```nushell "hello" | length Error: nu::parser::input_type_mismatch × Command does not support string input. ╭─[entry #22:1:11] 1 │ "hello" | length · ───┬── · ╰── command doesn't support string input ╰──── echo "hello" | length Error: nu:🐚:only_supports_this_input_type × Input type not supported. ╭─[entry #23:1:6] 1 │ echo "hello" | length · ───┬─── ───┬── · │ ╰── only list, table, binary, and nothing input data is supported · ╰── input type: string ╰──── ```
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.