Ideas: customer event protocol

[bobzhang]

suppose we have a data type

type data = 
| `exit of int * string 
| `fail of int * string * string 
[@@bs.deriving{event}]

We could derive such API

on_exit : (int -> string -> unit ) -> unit  [@@bs.send.pipe: emitter]
emit_exit : int -> string -> unit 
on_fail : (int -> string -> string -> unit) -> unit 
emit_fail : int -> string -> string -> unit 

We also need handle name collision too

[stale]

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