YTAPIScript.js

const YTAPI = "https://www.youtube.com/iframe_api";

async function loadYTAPI() {
    var tag = document.createElement('script');
    tag.src = YTAPI;
    
    var firstScriptTag = document.getElementsByTagName('script')[0];
    firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);

    await new Promise(function(resolve,reject) {
        onYouTubeIframeAPIReady = resolve; //!!! THIS IS AN EVENT  - empty function can be altered!!! 
        setTimeout(() => {
            reject("Failed to load YT API");
        }, 10000);
    });
    onYouTubeIframeAPIReady = function() {throw new Error("You cant just override this... again! Evil maggit!")};
}

var onYouTubeIframeAPIReady = function() {
    throw new Error("Overwriting \"onYouTubeIframeAPIReady\" variable has not worked propperly...")
}

async function createYTPlayer(playerID, width, height, videoID) {
    let ret;
    await new Promise(function(resolve,reject) {
        ret = new YT.Player(playerID, {
            width:width,
            height:height,
            videoId:videoID,
            events:{
                onReady:resolve,
                onStateChange: function(e) {ret.onPlayerStateChange(e)} 
            }
        });
    });
    ret.onPlayerStateChange = function() {};
    return ret;
};

async function changeYTVideo(YTPlayer, newVideo) { 
    YTPlayer.loadVideoById(newVideo);
};

async function jumpInVideo(YTPlayer, position) {
    YTPlayer.seekTo(position, true);
}

function currentPosition(YTPlayer) {
    return YTPlayer.getCurrentTime();
}