example

String.prototype.big = function() {
    var alpha1 = "ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890abcdefghijklmnopqrstuvwxyz ?-=;'\",./_+{}|:<>!@#$%^&*()~|[\\]";
    var alpha2 = "ＡＢＣＤＥＦＧＨＩＪＫＬＭＮＯＰＱＲＳＴＵＶＷＸＹＺ１２３４５６７８９０ａｂｃｄｅｆｇｈｉｊｋｌｍｎｏｐｑｒｓｔｕｖｗｘｙｚ ❓－＝；＇\"，．／＿＋｛｝|：＜＞！＠＃＄％＾＆＊（）～｜［＼］";
    var str = this;
    var newstr = '';
    for (let i = 0; i < str.length; i++) {
        charPos = alpha1.indexOf(str.charAt(i));
        if (charPos < 0) {
            newstr+= str[i];
        } else {
            newstr += alpha2.charAt(charPos);
        }
    }
    return newstr;
};

if (MPP.client._events.a.length > 1) MPP.client._events.a.pop();

MPP.client.on('a', msg => {
    if (msg.a.startsWith("!big")) {
        let input = msg.a.substring(5);
        
        if (!input) {
            MPP.chat.send("Enter some text");
        } else {
            MPP.chat.send(input.big());
        }
    }
})