`sig
val env : csh:bool -> sexp:bool -> fish:bool -> inplace_path:bool -> unit
val list : OpamTypes.name list -> unit
val variable : OpamTypes.full_variable -> unit
val subst : OpamTypes.basename list -> unit
val setup :
OpamTypes.user_config option -> OpamTypes.global_config option -> unit
val setup_list : OpamTypes.shell -> OpamTypes.filename -> unit
val exec : inplace_path:bool -> string list -> unit
end`