Protractor: How Should I Propagate An Error From Within Browser.executeasync?

If from a Protractor spec, I execute a script within browser.executeAsyncScript, how should I communicate that the script has indeed failed? Consider the following call to browser.

Solution 1:

From the webdriverjs doc:

driver.executeAsyncScript(function() {
  var callback = arguments[arguments.length - 1];
  var xhr = newXMLHttpRequest();
  xhr.open("GET", "/resource/data.json", true);
  xhr.onreadystatechange = function() {
    if (xhr.readyState == 4) {
      callback(xhr.responseText);
    }
  }
  xhr.send('');
}).then(function(str) {
  console.log(JSON.parse(str)['food']);
});

So, it does not seem to have an error callback, but you can pass some arguments to the callback method. You can use it to propagate errors.