You can search for identifiers within the package.
in-package search v0.2.0
type t
val pp : Format.formatter -> t -> unit
val with_mime : string -> t -> t
val with_extensions : string list -> t -> t
val with_output : string -> t -> t
val clear : t -> t
val output : t -> string option
val mime : t -> string option
val extensions : t -> string list
val concat : t -> t -> t
val empty : t