Creating a zip archive from a folder and preserving structure with Node.js

I'm trying to use Node.js to create a zip file from an existing folder, and preserve the structure.

I was hoping there would be a simple module to allow this kind of thing:

archiver.create("../folder", function(zipFile){ 
    console.log('et viola');
});

but I can't find anything of the sort!

I've been googling around, and the best I've found so far is zipstream, but as far as I can tell there's no way to do what I want. I don't really want to call into commandline utilities, as the the app has to be cross platform.

Any help would be greatly appreciated.

Thanks.

It's not entirely code free, but you can use node-native-zip in conjunction with folder.js. Usage:

function zipUpAFolder (dir, callback) {
    var archive = new zip();

    // map all files in the approot thru this function
    folder.mapAllFiles(dir, function (path, stats, callback) {
        // prepare for the .addFiles function
        callback({ 
            name: path.replace(dir, "").substr(1), 
            path: path 
        });
    }, function (err, data) {
        if (err) return callback(err);

        // add the files to the zip
        archive.addFiles(data, function (err) {
            if (err) return callback(err);

            // write the zip file
            fs.writeFile(dir + ".zip", archive.toBuffer(), function (err) {
                if (err) return callback(err);

                callback(null, dir + ".zip");
            });                    
        });
    });    
}