You can search for identifiers within the package.
in-package search v0.2.0
method then_ : ('a -> unit) Ezjs_min__.Js.callback -> ('a, 'b) promise0 Ezjs_min__.Js.t Ezjs_min__.Js.meth
method catch : ('b -> unit) Ezjs_min__.Js.callback -> ('a, 'b) promise0 Ezjs_min__.Js.t Ezjs_min__.Js.meth