`inherit Js_of_ocaml__.Dom_html.event`
`method message : Js_of_ocaml__.Js.js_string Js_of_ocaml__.Js.t Js_of_ocaml__.Js.readonly_prop`
`method filename : Js_of_ocaml__.Js.js_string Js_of_ocaml__.Js.t Js_of_ocaml__.Js.readonly_prop`
`method lineno : int Js_of_ocaml__.Js.readonly_prop`
`method colno : int Js_of_ocaml__.Js.readonly_prop`
`method error : Js_of_ocaml__.Js.Unsafe.any Js_of_ocaml__.Js.readonly_prop`