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# Description This PR makes some commands and areas of code preserve pipeline metadata. This is in an attempt to make the issue described in #12599 and #9456 less likely to occur. That is, reading and writing to the same file in a pipeline will result in an empty file. Since we preserve metadata in more places now, there will be a higher chance that we successfully detect this error case and abort the pipeline.
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.