You can search for identifiers within the package.
in-package search v0.2.0
server-reason-react.belt
Belt.Int
val toFloat : int -> float
val fromFloat : float -> int
val fromString : string -> int option
val toString : int -> string
val (+) : int -> int -> int
val (-) : int -> int -> int
val (*) : int -> int -> int
val (/) : int -> int -> int