You can search for identifiers within the package.
in-package search v0.2.0
type handler = [
| `Command of string
| `Function of string -> string option
]
val add : string -> handler -> unit
val remove : string -> unit
val exists : string -> bool
val find : string -> handler
val count_newlines : string -> int
val expand : string -> string -> string option
val register_command : string -> unit