How should event arguments be passed through trigger?

[anselmbradford]

In this line there's a call to this.trigger( BaseTransition.BEGIN_EVENT, { target: this } ) with two arguments. The second argument creates an object { target: this } to emulate event.target that ends up inside event handlers for other events in JS. That calls this method, so that the event name ends up as the first argument. That means the signature for event handlers of this would end up looking like:

function handleEvent( eventName, eventObject ) { …

This differs from a native event signature that would look like:

function handleEvent( eventObject ) { …

Do we want to match the native format or do we want to have the event name separate and pass an arbitrary number of arguments?

cc @sebworks

[anselmbradford]

Also, should this be dispatchEvent instead of trigger to follow the native API? https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/dispatchEvent