How to get errors stack trace in Chrome extension content script?

Question

There is a Google Chrome extension with `content script` that handles JS errors occured on all tabs pages. But the problem is that no one of usual methods of getting errors stack trace does not work. For example, there is a code in `content script` of Chrome extension: ``` window.addEventListener('error', function(event) { console.log(event.error.stack); // event.error will be null }, false); ``` If I call this code inside web page, so `event.error` will contains `Error` object with `stack` property. Same problem with trying to get stack trace using: ``` console.log((new Error()).stack)); ``` Does anybody knows some working issue to get error stack trace inside `content script` of Chrome extension? Error stack trace must be received as `string` or `Array`, means not just like some output in JS console by calling `console.trace()`. How to reproduce: - Download https://mega.co.nz/#!ENw00YAC!92gBZEoLCO9jPsWyKht4dbjYyo0Zk-PU5YAj0h88-3Q - Unpack `jzen.zip` to some `/jsen` folder - Open `ch…

Accepted Answer

As you mention, the `error` property of the event object is `null` when capturing the event in Content Script context, but it has the required info when captured in webpage context. So the solution is to capture the event in webpage context and use messaging to deliver it to the Content Script.

```
// This code will be injected to run in webpage context
function codeToInject() {
    window.addEventListener('error', function(e) {
        var error = {
            stack: e.error.stack
            // Add here any other properties you need, like e.filename, etc...
        };
        document.dispatchEvent(new CustomEvent('ReportError', {detail:error}));
    });
}

document.addEventListener('ReportError', function(e) {
    console.log('CONTENT SCRIPT', e.detail.stack);
});

//Inject code
var script = document.createElement('script');
script.textContent = '(' + codeToInject + '())';
(document.head||document.documentElement).appendChild(script);
script.parentNode.removeChild(script);
```

The techniques used are described in:

- https://stackoverflow.com/a/9517879/1507998

- https://stackoverflow.com/a/9636008/1507998

How to get errors stack trace in Chrome extension content script?

Solution

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