event handlers are not typed #283

I was attempting to implement some drill down functionality in the charts in my dashboard. Unfortunately, when I bound a method in my component to the (plotlyClick) output, I noticed that the type of $event was void. But my component method typed the event as unknown anyway, and I console.log the event object, and there is a ton of information in there.

On this line: https://github.com/plotly/angular-plotly.js/blob/master/projects/plotly/src/lib/plotly.component.ts#L241

...I can see that the output indeed is emitting data, just like my logging indicated. Is there anyway we could get these outputs typed? I imagine that the type would be pretty broad due to the amount of different charts/maps out there. But TypeScript thinking that the output is void is probably worse then just not knowing what the event data looks like, but still acknowledging its existence.