File.CoerceTo
val blob : file_any -> blob Js_of_ocaml.Js.t Js_of_ocaml.Js.Opt.t
val json : file_any -> 'a Js_of_ocaml.Js.Opt.t
val string :
file_any ->
Js_of_ocaml.Js.js_string Js_of_ocaml.Js.t Js_of_ocaml.Js.Opt.t
val arrayBuffer :
file_any ->
Js_of_ocaml.Typed_array.arrayBuffer Js_of_ocaml.Js.t Js_of_ocaml.Js.Opt.t