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