$ cue help exp
exp groups commands which are still in an experimental stage.

Experimental commands may be changed or removed at any time,
as the objective is to gain experience and then move the feature elsewhere.

Usage:
  cue exp <cmd> [arguments] [flags]
  cue exp [command]

Available Commands:
  gengotypes    generate Go types from CUE definitions
  writefs       remove and create files in bulk

Global Flags:
  -E, --all-errors     print all available errors
  -C, --chdir string   change working directory before running command (must be the first flag)
  -i, --ignore         proceed in the presence of errors
  -s, --simplify       simplify output

Use "cue exp [command] --help" for more information about a command.