Setting one variable in an one script tag into the global scope is not best practice. Please move this var to mw.config.
$:foo\> cd ../mediawiki-extensions/FlaggedRevs/ $:foo\> grep -r jsReviewNeedsChange . ./frontend/modules/ext.flaggedRevs.review.js: /*global jsReviewNeedsChange*/ ./frontend/modules/ext.flaggedRevs.review.js: if ( typeof jsReviewNeedsChange !== 'undefined' && jsReviewNeedsChange === 1 ) { ./frontend/RevisionReviewFormUI.php: $s .= '<script type="text/javascript">var jsReviewNeedsChange = ' .