$ 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:
  ast           inspect and manipulate CUE syntax trees
  gengotypes    generate Go types from CUE definitions
  writefs       remove and create files in bulk

Global Flags:
  -E, --all-errors[=true|false]   print all available errors
  -C, --chdir string              change working directory before running command (must be the first flag)
  -i, --ignore[=true|false]       proceed in the presence of errors

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