You can search for identifiers within the package.
in-package search v0.2.0
val map : 'a option -> f:('a -> 'b) -> 'b option
val compare : ('a -> 'a -> int) -> 'a option -> 'a option -> int
val is_some : 'a option -> bool
val is_none : 'a option -> bool
val value_exn : 'a option -> 'a