Module Js.Exn

Utilities for dealing with Js exceptions

type t
type exn += private
  1. | Error of t
val asJsExn : exn -> t option
val stack : t -> string option
val message : t -> string option
val name : t -> string option
val fileName : t -> string option
val isCamlExceptionOrOpenVariant : 'a -> bool

internal use only

val anyToExnInternal : 'a -> exn

anyToExnInternal obj will take any value obj and wrap it in a Js.Exn.Error if given value is not an exn already. If obj is an exn, it will return obj without any changes.

This function is mostly useful for cases where you want to unify a type of a value that potentially is either exn, a JS error, or any other JS value really (e.g. for a value passed to a Promise.catch callback)

IMPORTANT: This is an internal API and may be changed / removed any time in the future.

switch (Js.Exn.unsafeAnyToExn("test")) {
| Js.Exn.Error(v) =>
  switch (Js.Exn.message(v)) {
  | Some(str) => Js.log("We won't end up here")
  | None => Js.log2("We will land here: ", v)
  }
}
val raiseError : string -> 'a

Raise Js exception Error object with stacktrace

val raiseEvalError : string -> 'a
val raiseRangeError : string -> 'a
val raiseReferenceError : string -> 'a
val raiseSyntaxError : string -> 'a
val raiseTypeError : string -> 'a
val raiseUriError : string -> 'a