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A function that gets called when fetching succeeds. It can transform the response. Gets called for any type of Event source.

function( rawEvents, xhr )

Will receive two arguments, the raw response content and an XHR if applicable. The function can return a new array of parsable Event objects that will be used instead of the received response. Example:

eventSourceSuccess: function(content, xhr) {
  return content.eventArray;

This is useful if your server returns a wrapper object. If you are already receiving an array, and merely want to transform each individual item, use eventDataTransform instead.