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/*!
* VisualEditor tracking methods.
*
* @copyright See AUTHORS.txt
*/
( function () {
const callbacks = $.Callbacks( 'memory' ),
queue = [];
/**
* Track an analytic event.
*
* VisualEditor uses this method internally to track internal changes of state that are of analytic
* interest, either because they provide data about how users interact with the editor, or because
* they contain exception info, latency measurements, or other metrics that help gauge performance
* and reliability. VisualEditor does not transmit these events by default, but it provides a
* generic interface for routing these events to an analytics framework.
*
* @memberof ve
* @param {string} topic Event name
* @param {Object} [data] Additional data describing the event, encoded as an object
*/
ve.track = function ( topic, data ) {
queue.push( { topic: topic, timeStamp: ve.now(), data: data } );
callbacks.fire( queue );
};
/**
* Register a handler for subset of analytic events, specified by topic
*
* Handlers will be called once for each tracked event, including any events that fired before the
* handler was registered, with the topic, event data payload, and event timestamp as the first,
* second, and third arguments, respectively.
*
* @memberof ve
* @param {string} topic Handle events whose name starts with this string prefix
* @param {Function} callback Handler to call for each matching tracked event
*/
ve.trackSubscribe = function ( topic, callback ) {
let seen = 0;
callbacks.add( ( q ) => {
let event;
for ( ; seen < q.length; seen++ ) {
event = q[ seen ];
if ( event.topic.indexOf( topic ) === 0 ) {
callback( event.topic, event.data, event.timeStamp );
}
}
} );
};
}() );

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