Does sql.js support .mode and .output?

The following works:

var xhr = new XMLHttpRequest();
xhr.open('GET', 'a.db', true);
xhr.responseType = 'arraybuffer';

xhr.onload = function(e) {
    var uInt8Array = new Uint8Array(this.response);
    var db = new SQL.Database(uInt8Array);
    var contents = db.exec("SELECT * FROM listing");
    console.log(contents[0]);       
    };

But this doesn't:

db.run(".mode csv");
db.run(".output out.csv");

Error message:

Uncaught Error: near ".": syntax error