How to create a RAR archive in Total.js?

const Exec = require('child_process').exec;
const OPTIONS = {};

NEWOPERATION('compress', function(error, value, callback) {

    // value.path
    // value.filename

    var isFile = U.getExtension(value.path) !== '';
    var target = '*';

    if (isFile) {
        target = U.getName(value.path);
        OPTIONS.cwd = value.path.substring(0, value.path.length - target.length);
    } else
        OPTIONS.cwd = value.path;

    // Exclude directory "/tmp/"
    // Exec('rar a -r -ep1=*/tmp/* {0}'.format(value.filename)

    Exec('rar a -r {0} {1}'.format(value.filename, target), OPTIONS, function(err, response) {
        err && error.push(err);
        callback(value.filename);
    });
});

// Compress a directory:
OPERATION('compress', { path: '/home/documents/', filename: '/home/documents.rar' }, function(err, filename) {
    console.log(err, filename);
});

// Compress Total.js "databases" directory:
OPERATION('compress', { path: F.path.databases(), filename: F.path.public('databases.rar') }, function(err, filename) {
    console.log(err, filename);
});


// Compress a file:
OPERATION('compress', { path: '/home/documents/total.js', filename: '/home/total.rar' }, function(err, filename) {
    console.log(err, filename);
});