index.js
function createDirectory(filePath, cb) {
    var dirname = path.dirname(filePath);

    mkdirp(dirname, function (err) {
        if (!err) {
            cb();
        } else {
            console.error('Error creating directory: ', err);
        }
    });
}
function createDirectory(filePath, cb) {
    var dirname = path.dirname(filePath);

    mkdirp(dirname, function (err) {
        if (!err) {
            cb();
        } else {
            console.error('Error creating directory: ', err);
        }
    });
}
Creates the output dir
@param {String} filePath
@param cb