isFullScreen() is delayed

[gubi]

$('<a>', {"href": "javascript:;"}).append(
    $('<span>', {"class": "fas fa-expand"})
).click((e) => {
    $("#graph").fullscreen({
        toggleClass: "fullscreen"
    })
    console.log($.fullscreen.isFullScreen());
    console.log($("#graph").hasClass("fullscreen"));
})

When I click on the button the console reports this:

false
true