wikimedia/mediawiki-extensions-MobileFrontend

const browser = require( './Browser' ).getSingleton();

/**
 * Checks if sections should be collapsed by default.
 * @ignore
 *
 * @return {boolean}
 */
function isCollapsedByDefault() {
    return mw.config.get( 'wgMFCollapseSectionsByDefault' ) && !browser.isWideScreen() &&
        // Section collapsing can be disabled in MobilePreferences
        !document.documentElement.classList.contains(
            'mf-expand-sections-clientpref-1'
        );
}

module.exports = isCollapsedByDefault;