npm i sync-dir --save-dev

{
  "sync": {
    "/path/to/source/**/*": "/path/to/dest"
  }
}

module.exports = {
    "/path/to/source/**/*": "/path/to/dest"
};

# from package.json's sync property.
$ sync-dir 

# watch files
$ sync-dir -w

# from `sync.conf.js`
$ sync-dir -c ./sync.conf.js

const syncDir = require('sync-dir');
syncDir.copy({
    '/path/to/source/**/*': '/path/to/dest'
}).then(() => {
    // done
}).catch(() => {
    // error
});

const syncDir = require('sync-dir');
const DATA = {
    '/path/to/source/**/*': '/path/to/dest'
};
let files = syncDir.getFiles(DATA);
syncDir.watch(files,() => {
    syncDir.copy(DATA);
});