quick fs.writeFile meteor future style

function read_a_file_and_replace_x_with_smilies (filePath) {

    // Set up a future
    var fut = new Future();

    fs.readFile(filePath, function (err, data) {
        if (err) fut.return({ error: err });
        doImageMani(data, function (err) {
            if (err) fut.return({ error: err });
            // everythings done, no need to return anything
            fut.return();
        });

    });

    var error = fut.wait();
    if(error) {
        throw(error.error);
    }
}

write_future.return(fs.writeFile(path + name, blob, encoding, function(err) {
if (err) {
console.log(err);
throw (new Meteor.Error(500, 'Failed to save file.', err));
} else {
console.log('The file ' + name + ' (' + encoding + ') was saved to ' + path);
}
}));

return write_future.wait(Media.insert(media_item));