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# Description The `stress_internals` tests can fail sometimes, but usually not on the CI, because Nushell exits while the plugin is still trying to read or maybe write something, leading to a broken pipe. `nu-plugin` already exits with 1 without printing a message on a protocol-level I/O error, so this just doing the same thing. I think there's probably a way to correct the plugin handling so that we wait for plugins to shut down before exiting and this doesn't happen, but this is the quick fix in the meantime.
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.