watchstar.js
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watchstar.js
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	const watchstar = require( 'mediawiki.page.watch.ajax' ).watchstar;
	const WATCHED_ICON_CLASS = 'minerva-icon--unStar';
	const TEMP_WATCHED_ICON_CLASS = 'minerva-icon--halfStar';
	const UNWATCHED_ICON_CLASS = 'minerva-icon--star';

	/**
	* Tweaks the global watchstar handler in core to use the correct classes for Minerva.
	*
	* @param {jQuery} $icon
	* @ignore
	*/
	function init( $icon ) {
	const $watchlink = $icon.find( 'a' );
	watchstar( $watchlink, mw.config.get( 'wgRelevantPageName' ), toggleClasses );
	}

	/**
	* @param {jQuery} $link
	* @param {boolean} isWatched
	* @param {string} expiry
	* @private
	*/
	function toggleClasses( $link, isWatched, expiry ) {
	const $icon = $link.find( '.minerva-icon' );
	$icon.removeClass( [ WATCHED_ICON_CLASS, UNWATCHED_ICON_CLASS, TEMP_WATCHED_ICON_CLASS ] )
	.addClass( () => {
	let classes = UNWATCHED_ICON_CLASS;
	if ( isWatched ) {
	if ( expiry !== null && expiry !== undefined && expiry !== 'infinity' ) {
	classes = TEMP_WATCHED_ICON_CLASS;
	} else {
	classes = WATCHED_ICON_CLASS;
	}
	}
	return classes;
	} );
	}

	module.exports = {
	init: init,
	test: {
	toggleClasses,
	TEMP_WATCHED_ICON_CLASS,
	WATCHED_ICON_CLASS,
	UNWATCHED_ICON_CLASS
	}
	};