Add pre-reporting callback to be able to add per-report tags to a particular event.

[bisrael]

So, before a request is going to get fired off to sentry, handing that event to a callback so that I could return a set of tags or options to be appended to the requrest.

An example use (for me in paricular) is adding tags that specify requireJS: true/false to events that get caught by require's onError such as script loading or other stuff hapenning in a require load.

This is useful if the same event gets fired in both place for filtering.

[mattrobenolt]

Like this: https://github.com/getsentry/raven-js/blob/master/src/raven.js#L450-L452 ?

function callback(data) {
  data.something = 'lol';
  return data;
}

Raven.config('', {dataCallback: callback})

Or do you want something different?

[mattrobenolt]

This can be done with dataCallback