$ cue help environment
The cue command consults environment variables for configuration.
If an environment variable is unset or empty, sensible default setting is used.

	CUE_CACHE_DIR
		A directory structure to hold files which are reused between operations.
		It defaults to a directory for user-specific temporary data, such as:

		- "$XDG_CACHE_HOME/cue" or "$HOME/.cache/cue" on Linux
		- "$HOME/Library/Caches/cue" on MacOS
		- "%LocalAppData%/cue" on Windows

		Its contents are generally read-only and include:

		- mod/download for modules fetched from registries
		- mod/extract for extracted module archives

	CUE_CONFIG_DIR
		A directory to hold configuration and long-lived state files.
		It defaults to a directory for user-specific persistent data, such as:

		- "$XDG_CONFIG_HOME/cue" or "$HOME/.config/cue" on Linux
		- "$HOME/Library/Application Support/cue" on MacOS
		- "%AppData%/cue" on Windows

	CUE_REGISTRY
		The configuration to use when downloading and publishing modules.
		See "cue help registryconfig" for details.

	CUE_EXPERIMENT
		Comma-separated list of experiment flags to enable or disable:

		evalv3 (default true)
			Enable the new CUE evaluator, addressing performance issues
			and bringing a better disjunction algorithm.
		cmdreferencepkg (default true)
			Require referencing imported tool packages to declare "cue cmd" tasks.
		keepvalidators (default true)
			Prevent validators from simplifying into concrete values.
			See: https://cuelang.org/discussion/3775

	CUE_DEBUG
		Comma-separated list of debug flags to enable or disable, such as:

		http
			Log a JSON message per HTTP request and response made
			when interacting with module registries.
		sortfields
			Force fields in stucts to be sorted lexicographically.
		toolsflow
			Print task dependency mermaid graphs in 'cue cmd'.
		parsertrace
			Print a trace of parsed CUE productions.

CUE_EXPERIMENT and CUE_DEBUG are comma-separated lists of key-value strings,
where the value is a boolean "true" or "1" if omitted. For example:

	CUE_EXPERIMENT=toenable,todisable=0