React.E

`sig
type 'a t = 'a React.event
val never : 'a React.event
val create : unit -> 'a React.event * ('a -> unit)
val retain : 'a React.event -> (unit -> unit) -> [ `R of unit -> unit ]
val stop : 'a React.event -> unit
val equal : 'a React.event -> 'a React.event -> bool
val trace :
?iff:bool React.signal ->
('a -> unit) -> 'a React.event -> 'a React.event
val once : 'a React.event -> 'a React.event
val drop_once : 'a React.event -> 'a React.event
val app : ('a -> 'b) React.event -> 'a React.event -> 'b React.event
val map : ('a -> 'b) -> 'a React.event -> 'b React.event
val stamp : 'b React.event -> 'a -> 'a React.event
val filter : ('a -> bool) -> 'a React.event -> 'a React.event
val fmap : ('a -> 'b option) -> 'a React.event -> 'b React.event
val diff : ('a -> 'a -> 'b) -> 'a React.event -> 'b React.event
val changes : ?eq:('a -> 'a -> bool) -> 'a React.event -> 'a React.event
val when_ : bool React.signal -> 'a React.event -> 'a React.event
val dismiss : 'b React.event -> 'a React.event -> 'a React.event
val until : 'a React.event -> 'b React.event -> 'b React.event
val accum : ('a -> 'a) React.event -> 'a -> 'a React.event
val fold : ('a -> 'b -> 'a) -> 'a -> 'b React.event -> 'a React.event
val select : 'a React.event list -> 'a React.event
val merge : ('a -> 'b -> 'a) -> 'a -> 'b React.event list -> 'a React.event
val switch : 'a React.event -> 'a React.event React.event -> 'a React.event
val fix : ('a React.event -> 'a React.event * 'b) -> 'b
end`