You can search for identifiers within the package.
in-package search v0.2.0
val within_dir : string -> (unit -> 'a) -> 'b
val ensure_dir : string -> unit
val ensure_dir_path : string list -> unit
val ensure_remove_file : string -> unit
module Chan : sig ... end
module Proc : sig ... end
val copy_file : source:string -> dest:string -> unit
val copy_file_to_dir : source:string -> dest_dir:string -> unit