Promise and handling of errors in Google Chrome

Question

I am testing to rewrite som XMLHttpRequest -code with HTML5 Promise .

I did a mistake and the code in thePromise.then(failingCode) failed. This give a call to the reject function used when setting up the Promise .

I had to search a while to catch the error since I did not get any Call stack and no line number where the error occured.

That is of course very inconvenient.

How should I handle this? Should I send a bug report to the Google Chrome developers? Or, is it my own fault?

Answer 1

I just realized that there is a way to get the call stack in Google Chrome. Though it is a bit inconvenient you can do like this:

function failingCode(arg) {
    try {
        ... the failing code ...
    } catch(e) {
        console.log("failingCode error: "+e.stack);
        debugger;
    }
}

Please notice that if you throw an error you need to use the Error function to get a stack. (Simply throw "my message" will not give a stack.)

UPDATE Reported as a Chrome bug here: https://code.google.com/p/chromium/issues/detail?id=458306