phantombot-plugins/web/overlay/index.js

$(function () {

    const getQueryMap = () => {
        let queryString = window.location.search,
            queryParts = queryString.substring(1).split('&'),
            queryMap = new Map();

        for (let part in queryParts) {
            let key = part.substring(0, part.indexOf('=')),
                value = part.substring(part.indexOf('=') + 1, part.length);
            if (key.length > 0 && value.length > 0) queryMap.set(key, value);
        }
        return queryMap;
    }

    const getOrElse = (option, def) => queryMap.has(option) ?  queryMap.get(option): def;

    const handleSocketMessage = (e)=>{
        try {
            let rawMessage = e.data,
                message = JSON.parse(rawMessage);

            if(!message.hasOwnProperty('eventFamily') || message['eventFamily'] != 'overlay' || 
                !message.hasOwnProperty('eventType') || !message.hasOwnProperty['data'])
                return;

            if(message['eventType'] == 'follow') {
                console.log("New Follow !! ", message['data'])
            } else if(message['eventType'] == 'subscribe') {
                console.log("New Sub !! ", message['data'])
            } else if(message['eventType'] == 'donation') {
                console.log("New dono !! ", message['data'])
            } else if(message['eventType'] == 'timer') {
                console.log("New timer !! ", message['data'])
            }

        } catch (ex) {
            console.log(ex)
        }
    };

    const webSocket = window.socket,
          queryMap = getQueryMap();

    socket.addFamilyHandler("overlay", handleSocketMessage);

});