ve.js
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ve.js
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	/*!
	* VisualEditor namespace.
	*
	* @copyright See AUTHORS.txt
	*/

	/**
	* Namespace for all VisualEditor classes, static methods and static properties.
	*
	* @namespace ve
	*/
	window.ve = {};

	/**
	* Get the current time, measured in milliseconds since January 1, 1970 (UTC).
	*
	* @return {number} Current time, monotonic in modern browsers (via Performance Timeline API)
	*/
	ve.now = function () {
	// Based on `mw.now` in MediaWiki core.
	// Optimisation: Cache and re-use the chosen implementation.
	// Optimisation: Avoid startup overhead by re-defining on first call instead of IIFE.
	const perf = window.performance;
	const navStart = perf && perf.timing && perf.timing.navigationStart;
	ve.now = navStart && perf.now ?
	function () {
	return navStart + perf.now();
	} : Date.now;

	return ve.now();
	};