[Discord] Alert when a user goes online in a server

/*
This script will alert you with text to speech
when a target user is goes online inside your discord server.
*/

var alert_flags = [];

const targets = {
    "ᴶᵉˢˢ": {
        "tts_msg": "Jessica is active."
    },
    "Twink": {
        "tts_msg": "Jadie has active."
    }
};


function getNames() {
    var names = [];
    const collection = document.getElementsByClassName("name-uJV0GL");
    for (x = 0; x < collection.length; x++) {
        names.push(collection[x].textContent);
    }
    return names;
}


setInterval(function() {
    for (t = 0; t < Object.keys(targets).length; t++) {
        if (!alert_flags.includes(Object.keys(targets)[t])) {
            if (getNames().includes(Object.keys(targets)[t])) {
                alert_flags.push(Object.keys(targets)[t]);
                var tts_alert = new SpeechSynthesisUtterance(targets[Object.keys(targets)[t]]["tts_msg"]);
                window.speechSynthesis.speak(tts_alert);

            }
        }
    }
    for (y = 0; y < alert_flags.length; y++) {
        if (!getNames().includes(alert_flags[y])) {
            alert_flags.pop(alert_flags[y]);
        }
    }
}, 1000);