Class type `Push_js.pushManager`

method subscribe : subscription_options Js_of_ocaml.Js.t -> pushSubscription Js_of_ocaml.Js.t promise Js_of_ocaml.Js.t Js_of_ocaml.Js.meth
method getSubscription : pushSubscription Js_of_ocaml.Js.t Js_of_ocaml.Js.opt promise Js_of_ocaml.Js.t Js_of_ocaml.Js.meth