SessionExpander::init

static function init()
{
	global $USER;

	$sessid = bitrix_sessid();

	$signer = new SignSigner();
	$signedSessId = $signer->sign($sessid, static::getSalt());

	CJSCore::Init(['ajax', 'ls']);

	$jsCode = '';

	$asset = BitrixMainPageAsset::getInstance();
	$asset->addJs('/bitrix/js/main/session.js');
	$asset->addString($jsCode);
}