`sig val switch : ?compiler:OpamTypes.compiler -> quiet:bool -> warning:bool -> OpamTypes.switch -> unit val install : quiet:bool -> warning:bool -> update_config:bool -> OpamTypes.switch -> OpamTypes.compiler -> unit val import : OpamTypes.filename option -> unit val export : OpamTypes.filename option -> unit val remove : OpamTypes.switch -> unit val reinstall : OpamTypes.switch -> unit val list : print_short:bool -> installed:bool -> all:bool -> unit val show : unit -> unit end`