Ajax watch: Move JS config var to packageFiles

To improve performance, the watchlist expiry flag was moved to
packageFiles instead of the OutputPage.php file

Bug: T249259
Change-Id: If57030db7d1e90b0890ee2a1ad466772a2f8b8bc

includes/OutputPage.php

@@ -3332,7 +3332,6 @@ class OutputPage extends ContextSource {
 			'wgPageContentModel' => $title->getContentModel(),
 			'wgRelevantPageName' => $relevantTitle->getPrefixedDBkey(),
 			'wgRelevantArticleId' => $relevantTitle->getArticleID(),
-			'wgWatchlistExpiry' => $this->getContext()->getConfig()->get( 'WatchlistExpiry' ),
 		];
 		if ( $user->isLoggedIn() ) {
 			$vars['wgUserId'] = $user->getId();

resources/Resources.php

@@ -1504,8 +1504,13 @@ return [
 		],
 	],
 	'mediawiki.page.watch.ajax' => [
+		'localBasePath' => "$IP/resources/src",
+		'remoteBasePath' => "$wgResourceBasePath/resources/src",
 		'targets' => [ 'desktop', 'mobile' ],
-		'scripts' => 'resources/src/mediawiki.page.watch.ajax.js',
+		'packageFiles' => [
+			'mediawiki.page.watch.ajax.js',
+			[ 'name' => 'config.json', 'config' => [ 'WatchlistExpiry' ] ],
+		],
 		'dependencies' => [
 			'mediawiki.api',
 			'mediawiki.util',

resources/src/mediawiki.page.watch.ajax.js

@@ -181,7 +181,7 @@
 				.done( function ( watchResponse ) {
 					var message,
 						watchlistPopup = null,
-						isWatchlistExpiryEnabled = mw.config.get( 'wgWatchlistExpiry' ),
+						isWatchlistExpiryEnabled = require( './config.json' ).WatchlistExpiry,
 						otherAction = action === 'watch' ? 'unwatch' : 'watch';
 
 					if ( mwTitle.isTalkPage() ) {