Callback invoked twice on unhandled exception #527

const { SignedXml } = require("xml-crypto");
const crypto = require("crypto");

const xml = `<x xmlns:wsu='http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd' Id='_1'></x>`;
const sig = new SignedXml();
sig.privateKey = crypto.generateKeyPairSync("rsa", {
  modulusLength: 2048,
  privateKeyEncoding: {
    type: "pkcs1",
    format: "pem"
  }
}).privateKey;
sig.canonicalizationAlgorithm = "http://www.w3.org/2001/10/xml-exc-c14n#";
sig.signatureAlgorithm = "http://www.w3.org/2000/09/xmldsig#rsa-sha1";
sig.computeSignature(xml, (err, result) => {
  console.log("Callback invoked", !!err, !!result);
  throw new Error('Error Thrown');
});

// Results in:
// Callback invoked false true
// Callback invoked true false

// Error: Error Thrown

require('fs').readdir(".", (err, files) => {
  console.log("Callback invoked", !!err, !!files);
  throw new Error('Error Thrown');
});

// Results in:
// Callback invoked false true

// Error: Error Thrown