What dark magic is this

_index.md

What dark magic is this

error_to_exn.re

let jsErrorToExn = jsError => {
  let isObject = rawObj =>
    Js.typeof(rawObj) == "object"
    && !Js.Array.isArray(rawObj)
    && !((Obj.magic(rawObj): Js.null('a)) === Js.null);

  let couldBeError = rawObj => {
    let obj: {
      .
      "name": string,
      "message": string,
    } =
      Obj.magic(rawObj);

    !((Obj.magic(obj##message): Js.undefined('a)) === Js.undefined)
    && !((Obj.magic(obj##name): Js.undefined('a)) === Js.undefined);
   /* && Js.String.includes("SomethingSpecific", obj##name); */
  };

  isObject(jsError) ?
    couldBeError(jsError) ?
      Some(Js.Exn.internalToOCamlException(Obj.magic(jsError): Obj.t)) :
      None :
    None;
};