Make folder public available for google cloud storage

var gcloud = require('google-cloud');
var storage = gcloud.storage;
var fs = require('fs');

module.exports = ()=> {
    return new Promise((resolve, reject)=> {
        var gcs = storage({
            projectId: 'PROJECT_ID',
            keyFilename: __dirname+'/keys.json'
        });
        var bucket = gcs.bucket('dentaltw');

        findAllFiles(bucket)
            .then((files)=> {
                const promises = [];
                files.forEach((file, i)=> {
                    promises.push(file.makePublic());
                });

                Promise.all(promises).then(()=>{
                    console.log("ok");
                    resolve();
                });
            })
            .catch((err)=> {
                reject(err);
            });
    });

    function findAllFiles(bucket){
        return new Promise((resolve, reject)=> {
            bucket.getFiles((err, files)=> {
                if(err){reject(err);}
                resolve(files);
            });
        });
    }
};