Как дождаться ответа Ajax

async function DataEng() {
    return await $.ajax({
        type: "POST",
        url: urlControlSwitchLanguage,
        data: {
            language: "en"
        },
        success: (data) => {
            if ("error" in data) {
                console.error(data.error);
            } else {
                //console.log(data);
            }
        },
        error: (xhr, ajaxOptions, thrownError) => {
            console.log(xhr);
            console.log(ajaxOptions);
            console.log(thrownError);
        }
    });
}
 
let tmpDataEng = await DataEng();

function AjaxPOST(url, object, success, error) {
    let xhr = new XMLHttpRequest();
 
    xhr.open('POST', url, true);
 
    xhr.setRequestHeader('X-Requested-With', 'XMLHttpRequest');
    xhr.setRequestHeader('Content-Type', 'application/json;charset=UTF-8');
 
    xhr.timeout = 5000;
    xhr.ontimeout = () => {
        console.error("Request did not return i n а second.");
    };
 
    xhr.send(JSON.stringify(object));
 
    xhr.addEventListener("load", (e) => {
        const that = e.target;
        if (that.status >= 200 && that.status < 300 || that.status === 304) {
            success(JSON.parse(that.responseText));
        }
    }, false);
 
    xhr.addEventListener("error", (e) => {
        const that = e.target;
        error(that);
    }, false);
}

function AjaxPOSTAsync(url, object) {
    return new Promise((resolve, reject) => {
        const xhr = new XMLHttpRequest();
        xhr.open('POST', url, true);
        xhr.setRequestHeader('X-Requested-With', 'XMLHttpRequest');
        xhr.setRequestHeader('Content-Type', 'application/json;charset=UTF-8');
        xhr.onload = (e) => {
            const that = e.target;
            if (that.status >= 200 && that.status < 300 || that.status === 304) {
                resolve(JSON.parse(xhr.responseText));
            }
        };
        xhr.onerror = () => reject(xhr.statusText);
        xhr.send(JSON.stringify(object));
    });
}